Merge 75d5b7e1dc into 665f68036c

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_extend_from_shared_config.snap

@@ -179,6 +179,7 @@ linter.flake8_self.ignore_names = [
 	_name_,
 	_value_,
 ]
+linter.flake8_django.additional_path_functions = []
 linter.flake8_tidy_imports.ban_relative_imports = "parents"
 linter.flake8_tidy_imports.banned_api = {}
 linter.flake8_tidy_imports.banned_module_level_imports = []

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_no_tool.snap

@@ -181,6 +181,7 @@ linter.flake8_self.ignore_names = [
 	_name_,
 	_value_,
 ]
+linter.flake8_django.additional_path_functions = []
 linter.flake8_tidy_imports.ban_relative_imports = "parents"
 linter.flake8_tidy_imports.banned_api = {}
 linter.flake8_tidy_imports.banned_module_level_imports = []

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_no_tool_preview_enabled.snap

@@ -183,6 +183,7 @@ linter.flake8_self.ignore_names = [
 	_name_,
 	_value_,
 ]
+linter.flake8_django.additional_path_functions = []
 linter.flake8_tidy_imports.ban_relative_imports = "parents"
 linter.flake8_tidy_imports.banned_api = {}
 linter.flake8_tidy_imports.banned_module_level_imports = []

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_no_tool_target_version_override.snap

@@ -183,6 +183,7 @@ linter.flake8_self.ignore_names = [
 	_name_,
 	_value_,
 ]
+linter.flake8_django.additional_path_functions = []
 linter.flake8_tidy_imports.ban_relative_imports = "parents"
 linter.flake8_tidy_imports.banned_api = {}
 linter.flake8_tidy_imports.banned_module_level_imports = []

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_pyproject_toml_above.snap

@@ -180,6 +180,7 @@ linter.flake8_self.ignore_names = [
 	_name_,
 	_value_,
 ]
+linter.flake8_django.additional_path_functions = []
 linter.flake8_tidy_imports.ban_relative_imports = "parents"
 linter.flake8_tidy_imports.banned_api = {}
 linter.flake8_tidy_imports.banned_module_level_imports = []

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_pyproject_toml_above_with_tool.snap

@@ -180,6 +180,7 @@ linter.flake8_self.ignore_names = [
 	_name_,
 	_value_,
 ]
+linter.flake8_django.additional_path_functions = []
 linter.flake8_tidy_imports.ban_relative_imports = "parents"
 linter.flake8_tidy_imports.banned_api = {}
 linter.flake8_tidy_imports.banned_module_level_imports = []

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_ruff_toml_above-2.snap

@@ -179,6 +179,7 @@ linter.flake8_self.ignore_names = [
 	_name_,
 	_value_,
 ]
+linter.flake8_django.additional_path_functions = []
 linter.flake8_tidy_imports.ban_relative_imports = "parents"
 linter.flake8_tidy_imports.banned_api = {}
 linter.flake8_tidy_imports.banned_module_level_imports = []

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_ruff_toml_above.snap

@@ -179,6 +179,7 @@ linter.flake8_self.ignore_names = [
 	_name_,
 	_value_,
 ]
+linter.flake8_django.additional_path_functions = []
 linter.flake8_tidy_imports.ban_relative_imports = "parents"
 linter.flake8_tidy_imports.banned_api = {}
 linter.flake8_tidy_imports.banned_module_level_imports = []

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_ruff_toml_no_target_fallback.snap

@@ -179,6 +179,7 @@ linter.flake8_self.ignore_names = [
 	_name_,
 	_value_,
 ]
+linter.flake8_django.additional_path_functions = []
 linter.flake8_tidy_imports.ban_relative_imports = "parents"
 linter.flake8_tidy_imports.banned_api = {}
 linter.flake8_tidy_imports.banned_module_level_imports = []

crates/ruff/tests/snapshots/show_settings__display_default_settings.snap

@@ -292,6 +292,7 @@ linter.flake8_self.ignore_names = [
 	_name_,
 	_value_,
 ]
+linter.flake8_django.additional_path_functions = []
 linter.flake8_tidy_imports.ban_relative_imports = "parents"
 linter.flake8_tidy_imports.banned_api = {}
 linter.flake8_tidy_imports.banned_module_level_imports = []

crates/ruff_linter/resources/test/fixtures/flake8_django/DJ100.py

@@ -0,0 +1,46 @@
+from django.urls import path
+from . import views
+
+# Errors - missing trailing slash
+urlpatterns = [
+    path("help", views.help_view),  # DJ100
+    path("about", views.about_view),  # DJ100
+    path("contact", views.contact_view),  # DJ100
+    path("api/users", views.users_view),  # DJ100
+    path("blog/posts", views.posts_view),  # DJ100
+]
+
+# OK - has trailing slash
+urlpatterns_ok = [
+    path("help/", views.help_view),
+    path("about/", views.about_view),
+    path("contact/", views.contact_view),
+    path("api/users/", views.users_view),
+    path("blog/posts/", views.posts_view),
+]
+
+# OK - just root path
+urlpatterns_root = [
+    path("/", views.index_view),
+    path("", views.home_view),
+]
+
+# OK - with path parameters
+urlpatterns_params = [
+    path("users/<int:id>/", views.user_detail),
+    path("posts/<slug:slug>/", views.post_detail),
+]
+
+# Mixed cases
+urlpatterns_mixed = [
+    path("good/", views.good_view),
+    path("bad", views.bad_view),  # DJ100
+    path("also-good/", views.also_good_view),
+    path("also-bad", views.also_bad_view),  # DJ100
+]
+
+# Error - missing trail slash and argument should stay in message
+urlpatterns_params_bad = [
+    path("bad/<slug:slug>", views.bad_view),  # DJ100
+    path("<slug:slug>", views.bad_view),  # DJ100
+]

crates/ruff_linter/resources/test/fixtures/flake8_django/DJ100_custom_paths.py

@@ -0,0 +1,27 @@
+from mytools import path as mypath
+from . import views
+
+# Test that custom path functions are also checked
+urlpatterns_custom = [
+    mypath("help", views.help_view),  # DJ100
+    mypath("about", views.about_view),  # DJ100
+]
+
+# OK - custom path with trailing slash
+urlpatterns_custom_ok = [
+    mypath("help/", views.help_view),
+    mypath("about/", views.about_view),
+]
+
+# Test multiple violations in same list
+urlpatterns_multiple = [
+    mypath("api/users", views.users_view),  # DJ100
+    mypath("api/posts", views.posts_view),  # DJ100
+    mypath("api/comments/", views.comments_view),  # OK
+]
+
+# OK - root path and empty string
+urlpatterns_edge_cases = [
+    mypath("/", views.root_view),  # OK - root path
+    mypath("", views.empty_view),  # OK - empty string
+]

crates/ruff_linter/resources/test/fixtures/flake8_django/DJ101.py

@@ -0,0 +1,54 @@
+from django.urls import path
+from . import views
+
+# Errors - leading slash
+urlpatterns = [
+    path("/help/", views.help_view),  # DJ101
+    path("/about/", views.about_view),  # DJ101
+    path("/contact/", views.contact_view),  # DJ101
+    path("/api/users/", views.users_view),  # DJ101
+    path("/blog/posts/", views.posts_view),  # DJ101
+]
+
+# OK - no leading slash
+urlpatterns_ok = [
+    path("help/", views.help_view),
+    path("about/", views.about_view),
+    path("contact/", views.contact_view),
+    path("api/users/", views.users_view),
+    path("blog/posts/", views.posts_view),
+]
+
+# OK - just root path
+urlpatterns_root = [
+    path("/", views.index_view),
+    path("", views.home_view),
+]
+
+# OK - with path parameters
+urlpatterns_params = [
+    path("users/<int:id>/", views.user_detail),
+    path("posts/<slug:slug>/", views.post_detail),
+]
+
+# Mixed cases
+urlpatterns_mixed = [
+    path("good/", views.good_view),
+    path("/bad/", views.bad_view),  # DJ101
+    path("also-good/", views.also_good_view),
+    path("/also-bad/", views.also_bad_view),  # DJ101
+]
+
+# Edge cases with different quote styles
+urlpatterns_quotes = [
+    path('/single-quote/', views.single_quote_view),  # DJ101
+    path("/double-quote/", views.double_quote_view),  # DJ101
+    path('''/triple-single/''', views.triple_single_view),  # DJ101
+    path("""/triple-double/""", views.triple_double_view),  # DJ101
+]
+
+# Error - leading trail slash and argument should stay in message
+urlpatterns_params_bad = [
+    path("/bad/<slug:slug>/", views.bad_view),  # DJ101
+    path("/<slug:slug>", views.bad_view),  # DJ101
+]

crates/ruff_linter/resources/test/fixtures/flake8_django/DJ101_custom_paths.py

@@ -0,0 +1,29 @@
+from mytools import path as mypath
+from . import views
+
+# Test that custom path functions are also checked for leading slashes
+urlpatterns_custom = [
+    mypath("/help/", views.help_view),  # DJ101
+    mypath("/about/", views.about_view),  # DJ101
+]
+
+# OK - custom path without leading slash
+urlpatterns_custom_ok = [
+    mypath("help/", views.help_view),
+    mypath("about/", views.about_view),
+]
+
+# Test multiple violations in same list
+urlpatterns_multiple = [
+    mypath("/api/users/", views.users_view),  # DJ101
+    mypath("/api/posts/", views.posts_view),  # DJ101
+    mypath("api/comments/", views.comments_view),  # OK
+]
+
+
+# OK - root path and empty string
+urlpatterns_edge_cases = [
+
+    mypath("/", views.root_view),  # OK - root path
+    mypath("", views.empty_view),  # OK - empty string
+]

crates/ruff_linter/src/checkers/ast/analyze/expression.rs

@@ -1181,6 +1181,12 @@ pub(crate) fn expression(expr: &Expr, checker: &Checker) {
             if checker.is_rule_enabled(Rule::DjangoLocalsInRenderFunction) {
                 flake8_django::rules::locals_in_render_function(checker, call);
             }
+            if checker.is_rule_enabled(Rule::DjangoURLPathWithoutTrailingSlash) {
+                flake8_django::rules::url_path_without_trailing_slash(checker, call);
+            }
+            if checker.is_rule_enabled(Rule::DjangoURLPathWithLeadingSlash) {
+                flake8_django::rules::url_path_with_leading_slash(checker, call);
+            }
             if checker.is_rule_enabled(Rule::UnsupportedMethodCallOnAll) {
                 flake8_pyi::rules::unsupported_method_call_on_all(checker, func);
             }

crates/ruff_linter/src/codes.rs

@@ -1100,6 +1100,8 @@ pub fn code_to_rule(linter: Linter, code: &str) -> Option<(RuleGroup, Rule)> {
         (Flake8Django, "008") => rules::flake8_django::rules::DjangoModelWithoutDunderStr,
         (Flake8Django, "012") => rules::flake8_django::rules::DjangoUnorderedBodyContentInModel,
         (Flake8Django, "013") => rules::flake8_django::rules::DjangoNonLeadingReceiverDecorator,
+        (Flake8Django, "100") => rules::flake8_django::rules::DjangoURLPathWithoutTrailingSlash,
+        (Flake8Django, "101") => rules::flake8_django::rules::DjangoURLPathWithLeadingSlash,
 
         // flynt
         // Reserved: (Flynt, "001") => Rule: :StringConcatenationToFString,

crates/ruff_linter/src/rules/flake8_django/mod.rs

@@ -1,6 +1,7 @@
 //! Rules from [django-flake8](https://pypi.org/project/flake8-django/)
 mod helpers;
 pub(crate) mod rules;
+pub mod settings;
 
 #[cfg(test)]
 mod tests {
@@ -18,6 +19,8 @@ mod tests {
     #[test_case(Rule::DjangoExcludeWithModelForm, Path::new("DJ006.py"))]
     #[test_case(Rule::DjangoAllWithModelForm, Path::new("DJ007.py"))]
     #[test_case(Rule::DjangoModelWithoutDunderStr, Path::new("DJ008.py"))]
+    #[test_case(Rule::DjangoURLPathWithoutTrailingSlash, Path::new("DJ100.py"))]
+    #[test_case(Rule::DjangoURLPathWithLeadingSlash, Path::new("DJ101.py"))]
     #[test_case(Rule::DjangoUnorderedBodyContentInModel, Path::new("DJ012.py"))]
     #[test_case(Rule::DjangoNonLeadingReceiverDecorator, Path::new("DJ013.py"))]
     fn rules(rule_code: Rule, path: &Path) -> Result<()> {
@@ -29,4 +32,25 @@ mod tests {
         assert_diagnostics!(snapshot, diagnostics);
         Ok(())
     }
+
+    #[test]
+    fn test_additional_path_functions_dj100() -> Result<()> {
+        let mut settings =
+            settings::LinterSettings::for_rule(Rule::DjangoURLPathWithoutTrailingSlash);
+        settings.flake8_django.additional_path_functions = vec!["mytools.path".to_string()];
+
+        let diagnostics = test_path(Path::new("flake8_django/DJ100_custom_paths.py"), &settings)?;
+        assert_diagnostics!("DJ100_custom_paths.py", diagnostics);
+        Ok(())
+    }
+
+    #[test]
+    fn test_additional_path_functions_dj101() -> Result<()> {
+        let mut settings = settings::LinterSettings::for_rule(Rule::DjangoURLPathWithLeadingSlash);
+        settings.flake8_django.additional_path_functions = vec!["mytools.path".to_string()];
+
+        let diagnostics = test_path(Path::new("flake8_django/DJ101_custom_paths.py"), &settings)?;
+        assert_diagnostics!("DJ101_custom_paths.py", diagnostics);
+        Ok(())
+    }
 }

crates/ruff_linter/src/rules/flake8_django/rules/mod.rs

@@ -5,6 +5,8 @@ pub(crate) use model_without_dunder_str::*;
 pub(crate) use non_leading_receiver_decorator::*;
 pub(crate) use nullable_model_string_field::*;
 pub(crate) use unordered_body_content_in_model::*;
+pub(crate) use url_path_with_leading_slash::*;
+pub(crate) use url_path_without_trailing_slash::*;
 
 mod all_with_model_form;
 mod exclude_with_model_form;
@@ -13,3 +15,5 @@ mod model_without_dunder_str;
 mod non_leading_receiver_decorator;
 mod nullable_model_string_field;
 mod unordered_body_content_in_model;
+mod url_path_with_leading_slash;
+mod url_path_without_trailing_slash;

crates/ruff_linter/src/rules/flake8_django/rules/url_path_with_leading_slash.rs

@@ -0,0 +1,131 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::{self as ast, Expr};
+use ruff_text_size::{Ranged, TextSize};
+
+use crate::checkers::ast::Checker;
+use crate::{AlwaysFixableViolation, Edit, Fix};
+
+/// ## What it does
+/// Checks that all Django URL route definitions using `django.urls.path()`
+/// do not start with a leading slash.
+///
+/// ## Why is this bad?
+/// Django's URL patterns should not start with a leading slash. When using
+/// `include()` or when patterns are combined, leading slashes can cause
+/// issues with URL resolution. The Django documentation recommends that
+/// URL patterns should not have leading slashes, as they are not necessary
+/// and can lead to unexpected behavior.
+///
+/// ## Example
+/// ```python
+/// from django.urls import path
+/// from . import views
+///
+/// urlpatterns = [
+///     path("/help/", views.help_view),  # Leading slash
+///     path("/about/", views.about_view),  # Leading slash
+/// ]
+/// ```
+///
+/// Use instead:
+/// ```python
+/// from django.urls import path
+/// from . import views
+///
+/// urlpatterns = [
+///     path("help/", views.help_view),
+///     path("about/", views.about_view),
+/// ]
+/// ```
+///
+/// ## References
+/// - [Django documentation: URL dispatcher](https://docs.djangoproject.com/en/stable/topics/http/urls/)
+#[derive(ViolationMetadata)]
+#[violation_metadata(preview_since = "v0.14.4")]
+pub(crate) struct DjangoURLPathWithLeadingSlash {
+    url_pattern: String,
+}
+
+impl AlwaysFixableViolation for DjangoURLPathWithLeadingSlash {
+    #[derive_message_formats]
+    fn message(&self) -> String {
+        let DjangoURLPathWithLeadingSlash { url_pattern } = self;
+        format!("URL route `{url_pattern}` has an unnecessary leading slash")
+    }
+
+    fn fix_title(&self) -> String {
+        "Remove leading slash".to_string()
+    }
+}
+
+/// DJ101
+pub(crate) fn url_path_with_leading_slash(checker: &Checker, call: &ast::ExprCall) {
+    // Check if this is a call to django.urls.path or any additional configured path functions
+    let is_path_function = checker
+        .semantic()
+        .resolve_qualified_name(&call.func)
+        .is_some_and(|qualified_name| {
+            let segments = qualified_name.segments();
+
+            // Check if it's the default django.urls.path
+            if matches!(segments, ["django", "urls", "path"]) {
+                return true;
+            }
+
+            // Check if it matches any additional configured path functions
+            let qualified_name_str = segments.join(".");
+            checker
+                .settings()
+                .flake8_django
+                .additional_path_functions
+                .iter()
+                .any(|path| path == &qualified_name_str)
+        });
+
+    if !is_path_function {
+        return;
+    }
+
+    // Get the first argument (the route pattern)
+    let Some(route_arg) = call.arguments.args.first() else {
+        return;
+    };
+
+    // Check if it's a string literal
+    if let Expr::StringLiteral(ast::ExprStringLiteral { value, .. }) = route_arg {
+        let route = value.to_str();
+
+        // Skip empty strings and root path "/"
+        if route.is_empty() || route == "/" {
+            return;
+        }
+
+        // Check if route starts with a leading slash
+        if route.starts_with('/') {
+            // Report diagnostic for routes with leading slash
+            let mut diagnostic = checker.report_diagnostic(
+                DjangoURLPathWithLeadingSlash {
+                    url_pattern: route.to_string(),
+                },
+                route_arg.range(),
+            );
+
+            // Determine the quote style to find the insertion point for removal
+            let string_content = checker.locator().slice(route_arg.range());
+            let quote_len =
+                if string_content.starts_with("'''") || string_content.starts_with("\"\"\"") {
+                    3
+                } else if string_content.starts_with('\'') || string_content.starts_with('"') {
+                    1
+                } else {
+                    return; // Invalid string format
+                };
+
+            // Remove the leading slash (after the opening quote(s))
+            let removal_start = route_arg.range().start() + TextSize::new(quote_len);
+            let removal_end = removal_start + TextSize::new(1); // Remove one character (the slash)
+
+            diagnostic.set_fix(Fix::safe_edit(Edit::deletion(removal_start, removal_end)));
+        }
+    }
+}

crates/ruff_linter/src/rules/flake8_django/rules/url_path_without_trailing_slash.rs

@@ -0,0 +1,134 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_python_ast::{self as ast, Expr};
+use ruff_text_size::{Ranged, TextSize};
+
+use crate::checkers::ast::Checker;
+use crate::{AlwaysFixableViolation, Edit, Fix};
+
+/// ## What it does
+/// Checks that all Django URL route definitions using `django.urls.path()`
+/// end with a trailing slash.
+///
+/// ## Why is this bad?
+/// Django's convention is to use trailing slashes in URL patterns. This is
+/// enforced by the `APPEND_SLASH` setting (enabled by default), which
+/// redirects requests without trailing slashes to URLs with them. Omitting
+/// the trailing slash can lead to unnecessary redirects and inconsistent URL
+/// patterns throughout your application.
+///
+/// ## Example
+/// ```python
+/// from django.urls import path
+/// from . import views
+///
+/// urlpatterns = [
+///     path("help", views.help_view),  # Missing trailing slash
+///     path("about", views.about_view),  # Missing trailing slash
+/// ]
+/// ```
+///
+/// Use instead:
+/// ```python
+/// from django.urls import path
+/// from . import views
+///
+/// urlpatterns = [
+///     path("help/", views.help_view),
+///     path("about/", views.about_view),
+/// ]
+/// ```
+///
+/// ## References
+/// - [Django documentation: URL dispatcher](https://docs.djangoproject.com/en/stable/topics/http/urls/)
+#[derive(ViolationMetadata)]
+#[violation_metadata(preview_since = "v0.14.4")]
+pub(crate) struct DjangoURLPathWithoutTrailingSlash {
+    url_pattern: String,
+}
+
+impl AlwaysFixableViolation for DjangoURLPathWithoutTrailingSlash {
+    #[derive_message_formats]
+    fn message(&self) -> String {
+        let DjangoURLPathWithoutTrailingSlash { url_pattern } = self;
+        format!("URL route `{url_pattern}` is missing a trailing slash")
+    }
+
+    fn fix_title(&self) -> String {
+        "Add trailing slash".to_string()
+    }
+}
+
+/// DJ100
+pub(crate) fn url_path_without_trailing_slash(checker: &Checker, call: &ast::ExprCall) {
+    // Check if this is a call to django.urls.path or any additional configured path functions
+    let is_path_function = checker
+        .semantic()
+        .resolve_qualified_name(&call.func)
+        .is_some_and(|qualified_name| {
+            let segments = qualified_name.segments();
+
+            // Check if it's the default django.urls.path
+            if matches!(segments, ["django", "urls", "path"]) {
+                return true;
+            }
+
+            // Check if it matches any additional configured path functions
+            let qualified_name_str = segments.join(".");
+            checker
+                .settings()
+                .flake8_django
+                .additional_path_functions
+                .iter()
+                .any(|path| path == &qualified_name_str)
+        });
+
+    if !is_path_function {
+        return;
+    }
+
+    // Get the first argument (the route pattern)
+    let Some(route_arg) = call.arguments.args.first() else {
+        return;
+    };
+
+    // Check if it's a string literal
+    if let Expr::StringLiteral(ast::ExprStringLiteral { value, .. }) = route_arg {
+        let route = value.to_str();
+
+        // Skip empty strings
+        if route.is_empty() {
+            return;
+        }
+
+        // Skip routes that are just "/" or already end with "/"
+        if route == "/" || route.ends_with('/') {
+            return;
+        }
+
+        // Report diagnostic for routes without trailing slash
+        let mut diagnostic = checker.report_diagnostic(
+            DjangoURLPathWithoutTrailingSlash {
+                url_pattern: route.to_string(),
+            },
+            route_arg.range(),
+        );
+
+        // Determine the quote style to find the insertion point for the slash
+        // (just before the closing quotes)
+        let string_content = checker.locator().slice(route_arg.range());
+        let quote_len = if string_content.ends_with("'''") || string_content.ends_with("\"\"\"") {
+            3
+        } else if string_content.ends_with('\'') || string_content.ends_with('"') {
+            1
+        } else {
+            return; // Invalid string format
+        };
+
+        // Insert "/" just before the closing quote(s)
+        let insertion_point = route_arg.range().end() - TextSize::new(quote_len);
+        diagnostic.set_fix(Fix::safe_edit(Edit::insertion(
+            "/".to_string(),
+            insertion_point,
+        )));
+    }
+}

crates/ruff_linter/src/rules/flake8_django/settings.rs

@@ -0,0 +1,23 @@
+//! Settings for the `flake8-django` plugin.
+
+use crate::display_settings;
+use ruff_macros::CacheKey;
+use std::fmt::{Display, Formatter};
+
+#[derive(Debug, Clone, CacheKey, Default)]
+pub struct Settings {
+    pub additional_path_functions: Vec<String>,
+}
+
+impl Display for Settings {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        display_settings! {
+            formatter = f,
+            namespace = "linter.flake8_django",
+            fields = [
+                self.additional_path_functions | array
+            ]
+        }
+        Ok(())
+    }
+}

crates/ruff_linter/src/rules/flake8_django/snapshots/ruff_linter__rules__flake8_django__tests__DJ100_DJ100.py.snap

@@ -0,0 +1,176 @@
+---
+source: crates/ruff_linter/src/rules/flake8_django/mod.rs
+---
+DJ100 [*] URL route `help` is missing a trailing slash
+ --> DJ100.py:6:10
+  |
+4 | # Errors - missing trailing slash
+5 | urlpatterns = [
+6 |     path("help", views.help_view),  # DJ100
+  |          ^^^^^^
+7 |     path("about", views.about_view),  # DJ100
+8 |     path("contact", views.contact_view),  # DJ100
+  |
+help: Add trailing slash
+3 | 
+4 | # Errors - missing trailing slash
+5 | urlpatterns = [
+  -     path("help", views.help_view),  # DJ100
+6 +     path("help/", views.help_view),  # DJ100
+7 |     path("about", views.about_view),  # DJ100
+8 |     path("contact", views.contact_view),  # DJ100
+9 |     path("api/users", views.users_view),  # DJ100
+
+DJ100 [*] URL route `about` is missing a trailing slash
+ --> DJ100.py:7:10
+  |
+5 | urlpatterns = [
+6 |     path("help", views.help_view),  # DJ100
+7 |     path("about", views.about_view),  # DJ100
+  |          ^^^^^^^
+8 |     path("contact", views.contact_view),  # DJ100
+9 |     path("api/users", views.users_view),  # DJ100
+  |
+help: Add trailing slash
+4  | # Errors - missing trailing slash
+5  | urlpatterns = [
+6  |     path("help", views.help_view),  # DJ100
+   -     path("about", views.about_view),  # DJ100
+7  +     path("about/", views.about_view),  # DJ100
+8  |     path("contact", views.contact_view),  # DJ100
+9  |     path("api/users", views.users_view),  # DJ100
+10 |     path("blog/posts", views.posts_view),  # DJ100
+
+DJ100 [*] URL route `contact` is missing a trailing slash
+  --> DJ100.py:8:10
+   |
+ 6 |     path("help", views.help_view),  # DJ100
+ 7 |     path("about", views.about_view),  # DJ100
+ 8 |     path("contact", views.contact_view),  # DJ100
+   |          ^^^^^^^^^
+ 9 |     path("api/users", views.users_view),  # DJ100
+10 |     path("blog/posts", views.posts_view),  # DJ100
+   |
+help: Add trailing slash
+5  | urlpatterns = [
+6  |     path("help", views.help_view),  # DJ100
+7  |     path("about", views.about_view),  # DJ100
+   -     path("contact", views.contact_view),  # DJ100
+8  +     path("contact/", views.contact_view),  # DJ100
+9  |     path("api/users", views.users_view),  # DJ100
+10 |     path("blog/posts", views.posts_view),  # DJ100
+11 | ]
+
+DJ100 [*] URL route `api/users` is missing a trailing slash
+  --> DJ100.py:9:10
+   |
+ 7 |     path("about", views.about_view),  # DJ100
+ 8 |     path("contact", views.contact_view),  # DJ100
+ 9 |     path("api/users", views.users_view),  # DJ100
+   |          ^^^^^^^^^^^
+10 |     path("blog/posts", views.posts_view),  # DJ100
+11 | ]
+   |
+help: Add trailing slash
+6  |     path("help", views.help_view),  # DJ100
+7  |     path("about", views.about_view),  # DJ100
+8  |     path("contact", views.contact_view),  # DJ100
+   -     path("api/users", views.users_view),  # DJ100
+9  +     path("api/users/", views.users_view),  # DJ100
+10 |     path("blog/posts", views.posts_view),  # DJ100
+11 | ]
+12 | 
+
+DJ100 [*] URL route `blog/posts` is missing a trailing slash
+  --> DJ100.py:10:10
+   |
+ 8 |     path("contact", views.contact_view),  # DJ100
+ 9 |     path("api/users", views.users_view),  # DJ100
+10 |     path("blog/posts", views.posts_view),  # DJ100
+   |          ^^^^^^^^^^^^
+11 | ]
+   |
+help: Add trailing slash
+7  |     path("about", views.about_view),  # DJ100
+8  |     path("contact", views.contact_view),  # DJ100
+9  |     path("api/users", views.users_view),  # DJ100
+   -     path("blog/posts", views.posts_view),  # DJ100
+10 +     path("blog/posts/", views.posts_view),  # DJ100
+11 | ]
+12 | 
+13 | # OK - has trailing slash
+
+DJ100 [*] URL route `bad` is missing a trailing slash
+  --> DJ100.py:37:10
+   |
+35 | urlpatterns_mixed = [
+36 |     path("good/", views.good_view),
+37 |     path("bad", views.bad_view),  # DJ100
+   |          ^^^^^
+38 |     path("also-good/", views.also_good_view),
+39 |     path("also-bad", views.also_bad_view),  # DJ100
+   |
+help: Add trailing slash
+34 | # Mixed cases
+35 | urlpatterns_mixed = [
+36 |     path("good/", views.good_view),
+   -     path("bad", views.bad_view),  # DJ100
+37 +     path("bad/", views.bad_view),  # DJ100
+38 |     path("also-good/", views.also_good_view),
+39 |     path("also-bad", views.also_bad_view),  # DJ100
+40 | ]
+
+DJ100 [*] URL route `also-bad` is missing a trailing slash
+  --> DJ100.py:39:10
+   |
+37 |     path("bad", views.bad_view),  # DJ100
+38 |     path("also-good/", views.also_good_view),
+39 |     path("also-bad", views.also_bad_view),  # DJ100
+   |          ^^^^^^^^^^
+40 | ]
+   |
+help: Add trailing slash
+36 |     path("good/", views.good_view),
+37 |     path("bad", views.bad_view),  # DJ100
+38 |     path("also-good/", views.also_good_view),
+   -     path("also-bad", views.also_bad_view),  # DJ100
+39 +     path("also-bad/", views.also_bad_view),  # DJ100
+40 | ]
+41 | 
+42 | # Error - missing trail slash and argument should stay in message
+
+DJ100 [*] URL route `bad/<slug:slug>` is missing a trailing slash
+  --> DJ100.py:44:10
+   |
+42 | # Error - missing trail slash and argument should stay in message
+43 | urlpatterns_params_bad = [
+44 |     path("bad/<slug:slug>", views.bad_view),  # DJ100
+   |          ^^^^^^^^^^^^^^^^^
+45 |     path("<slug:slug>", views.bad_view),  # DJ100
+46 | ]
+   |
+help: Add trailing slash
+41 | 
+42 | # Error - missing trail slash and argument should stay in message
+43 | urlpatterns_params_bad = [
+   -     path("bad/<slug:slug>", views.bad_view),  # DJ100
+44 +     path("bad/<slug:slug>/", views.bad_view),  # DJ100
+45 |     path("<slug:slug>", views.bad_view),  # DJ100
+46 | ]
+
+DJ100 [*] URL route `<slug:slug>` is missing a trailing slash
+  --> DJ100.py:45:10
+   |
+43 | urlpatterns_params_bad = [
+44 |     path("bad/<slug:slug>", views.bad_view),  # DJ100
+45 |     path("<slug:slug>", views.bad_view),  # DJ100
+   |          ^^^^^^^^^^^^^
+46 | ]
+   |
+help: Add trailing slash
+42 | # Error - missing trail slash and argument should stay in message
+43 | urlpatterns_params_bad = [
+44 |     path("bad/<slug:slug>", views.bad_view),  # DJ100
+   -     path("<slug:slug>", views.bad_view),  # DJ100
+45 +     path("<slug:slug>/", views.bad_view),  # DJ100
+46 | ]

crates/ruff_linter/src/rules/flake8_django/snapshots/ruff_linter__rules__flake8_django__tests__DJ100_custom_paths.py.snap

@@ -0,0 +1,81 @@
+---
+source: crates/ruff_linter/src/rules/flake8_django/mod.rs
+---
+DJ100 [*] URL route `help` is missing a trailing slash
+ --> DJ100_custom_paths.py:6:12
+  |
+4 | # Test that custom path functions are also checked
+5 | urlpatterns_custom = [
+6 |     mypath("help", views.help_view),  # DJ100
+  |            ^^^^^^
+7 |     mypath("about", views.about_view),  # DJ100
+8 | ]
+  |
+help: Add trailing slash
+3 | 
+4 | # Test that custom path functions are also checked
+5 | urlpatterns_custom = [
+  -     mypath("help", views.help_view),  # DJ100
+6 +     mypath("help/", views.help_view),  # DJ100
+7 |     mypath("about", views.about_view),  # DJ100
+8 | ]
+9 | 
+
+DJ100 [*] URL route `about` is missing a trailing slash
+ --> DJ100_custom_paths.py:7:12
+  |
+5 | urlpatterns_custom = [
+6 |     mypath("help", views.help_view),  # DJ100
+7 |     mypath("about", views.about_view),  # DJ100
+  |            ^^^^^^^
+8 | ]
+  |
+help: Add trailing slash
+4  | # Test that custom path functions are also checked
+5  | urlpatterns_custom = [
+6  |     mypath("help", views.help_view),  # DJ100
+   -     mypath("about", views.about_view),  # DJ100
+7  +     mypath("about/", views.about_view),  # DJ100
+8  | ]
+9  | 
+10 | # OK - custom path with trailing slash
+
+DJ100 [*] URL route `api/users` is missing a trailing slash
+  --> DJ100_custom_paths.py:18:12
+   |
+16 | # Test multiple violations in same list
+17 | urlpatterns_multiple = [
+18 |     mypath("api/users", views.users_view),  # DJ100
+   |            ^^^^^^^^^^^
+19 |     mypath("api/posts", views.posts_view),  # DJ100
+20 |     mypath("api/comments/", views.comments_view),  # OK
+   |
+help: Add trailing slash
+15 | 
+16 | # Test multiple violations in same list
+17 | urlpatterns_multiple = [
+   -     mypath("api/users", views.users_view),  # DJ100
+18 +     mypath("api/users/", views.users_view),  # DJ100
+19 |     mypath("api/posts", views.posts_view),  # DJ100
+20 |     mypath("api/comments/", views.comments_view),  # OK
+21 | ]
+
+DJ100 [*] URL route `api/posts` is missing a trailing slash
+  --> DJ100_custom_paths.py:19:12
+   |
+17 | urlpatterns_multiple = [
+18 |     mypath("api/users", views.users_view),  # DJ100
+19 |     mypath("api/posts", views.posts_view),  # DJ100
+   |            ^^^^^^^^^^^
+20 |     mypath("api/comments/", views.comments_view),  # OK
+21 | ]
+   |
+help: Add trailing slash
+16 | # Test multiple violations in same list
+17 | urlpatterns_multiple = [
+18 |     mypath("api/users", views.users_view),  # DJ100
+   -     mypath("api/posts", views.posts_view),  # DJ100
+19 +     mypath("api/posts/", views.posts_view),  # DJ100
+20 |     mypath("api/comments/", views.comments_view),  # OK
+21 | ]
+22 |

crates/ruff_linter/src/rules/flake8_django/snapshots/ruff_linter__rules__flake8_django__tests__DJ101_DJ101.py.snap

@@ -0,0 +1,255 @@
+---
+source: crates/ruff_linter/src/rules/flake8_django/mod.rs
+---
+DJ101 [*] URL route `/help/` has an unnecessary leading slash
+ --> DJ101.py:6:10
+  |
+4 | # Errors - leading slash
+5 | urlpatterns = [
+6 |     path("/help/", views.help_view),  # DJ101
+  |          ^^^^^^^^
+7 |     path("/about/", views.about_view),  # DJ101
+8 |     path("/contact/", views.contact_view),  # DJ101
+  |
+help: Remove leading slash
+3 | 
+4 | # Errors - leading slash
+5 | urlpatterns = [
+  -     path("/help/", views.help_view),  # DJ101
+6 +     path("help/", views.help_view),  # DJ101
+7 |     path("/about/", views.about_view),  # DJ101
+8 |     path("/contact/", views.contact_view),  # DJ101
+9 |     path("/api/users/", views.users_view),  # DJ101
+
+DJ101 [*] URL route `/about/` has an unnecessary leading slash
+ --> DJ101.py:7:10
+  |
+5 | urlpatterns = [
+6 |     path("/help/", views.help_view),  # DJ101
+7 |     path("/about/", views.about_view),  # DJ101
+  |          ^^^^^^^^^
+8 |     path("/contact/", views.contact_view),  # DJ101
+9 |     path("/api/users/", views.users_view),  # DJ101
+  |
+help: Remove leading slash
+4  | # Errors - leading slash
+5  | urlpatterns = [
+6  |     path("/help/", views.help_view),  # DJ101
+   -     path("/about/", views.about_view),  # DJ101
+7  +     path("about/", views.about_view),  # DJ101
+8  |     path("/contact/", views.contact_view),  # DJ101
+9  |     path("/api/users/", views.users_view),  # DJ101
+10 |     path("/blog/posts/", views.posts_view),  # DJ101
+
+DJ101 [*] URL route `/contact/` has an unnecessary leading slash
+  --> DJ101.py:8:10
+   |
+ 6 |     path("/help/", views.help_view),  # DJ101
+ 7 |     path("/about/", views.about_view),  # DJ101
+ 8 |     path("/contact/", views.contact_view),  # DJ101
+   |          ^^^^^^^^^^^
+ 9 |     path("/api/users/", views.users_view),  # DJ101
+10 |     path("/blog/posts/", views.posts_view),  # DJ101
+   |
+help: Remove leading slash
+5  | urlpatterns = [
+6  |     path("/help/", views.help_view),  # DJ101
+7  |     path("/about/", views.about_view),  # DJ101
+   -     path("/contact/", views.contact_view),  # DJ101
+8  +     path("contact/", views.contact_view),  # DJ101
+9  |     path("/api/users/", views.users_view),  # DJ101
+10 |     path("/blog/posts/", views.posts_view),  # DJ101
+11 | ]
+
+DJ101 [*] URL route `/api/users/` has an unnecessary leading slash
+  --> DJ101.py:9:10
+   |
+ 7 |     path("/about/", views.about_view),  # DJ101
+ 8 |     path("/contact/", views.contact_view),  # DJ101
+ 9 |     path("/api/users/", views.users_view),  # DJ101
+   |          ^^^^^^^^^^^^^
+10 |     path("/blog/posts/", views.posts_view),  # DJ101
+11 | ]
+   |
+help: Remove leading slash
+6  |     path("/help/", views.help_view),  # DJ101
+7  |     path("/about/", views.about_view),  # DJ101
+8  |     path("/contact/", views.contact_view),  # DJ101
+   -     path("/api/users/", views.users_view),  # DJ101
+9  +     path("api/users/", views.users_view),  # DJ101
+10 |     path("/blog/posts/", views.posts_view),  # DJ101
+11 | ]
+12 | 
+
+DJ101 [*] URL route `/blog/posts/` has an unnecessary leading slash
+  --> DJ101.py:10:10
+   |
+ 8 |     path("/contact/", views.contact_view),  # DJ101
+ 9 |     path("/api/users/", views.users_view),  # DJ101
+10 |     path("/blog/posts/", views.posts_view),  # DJ101
+   |          ^^^^^^^^^^^^^^
+11 | ]
+   |
+help: Remove leading slash
+7  |     path("/about/", views.about_view),  # DJ101
+8  |     path("/contact/", views.contact_view),  # DJ101
+9  |     path("/api/users/", views.users_view),  # DJ101
+   -     path("/blog/posts/", views.posts_view),  # DJ101
+10 +     path("blog/posts/", views.posts_view),  # DJ101
+11 | ]
+12 | 
+13 | # OK - no leading slash
+
+DJ101 [*] URL route `/bad/` has an unnecessary leading slash
+  --> DJ101.py:37:10
+   |
+35 | urlpatterns_mixed = [
+36 |     path("good/", views.good_view),
+37 |     path("/bad/", views.bad_view),  # DJ101
+   |          ^^^^^^^
+38 |     path("also-good/", views.also_good_view),
+39 |     path("/also-bad/", views.also_bad_view),  # DJ101
+   |
+help: Remove leading slash
+34 | # Mixed cases
+35 | urlpatterns_mixed = [
+36 |     path("good/", views.good_view),
+   -     path("/bad/", views.bad_view),  # DJ101
+37 +     path("bad/", views.bad_view),  # DJ101
+38 |     path("also-good/", views.also_good_view),
+39 |     path("/also-bad/", views.also_bad_view),  # DJ101
+40 | ]
+
+DJ101 [*] URL route `/also-bad/` has an unnecessary leading slash
+  --> DJ101.py:39:10
+   |
+37 |     path("/bad/", views.bad_view),  # DJ101
+38 |     path("also-good/", views.also_good_view),
+39 |     path("/also-bad/", views.also_bad_view),  # DJ101
+   |          ^^^^^^^^^^^^
+40 | ]
+   |
+help: Remove leading slash
+36 |     path("good/", views.good_view),
+37 |     path("/bad/", views.bad_view),  # DJ101
+38 |     path("also-good/", views.also_good_view),
+   -     path("/also-bad/", views.also_bad_view),  # DJ101
+39 +     path("also-bad/", views.also_bad_view),  # DJ101
+40 | ]
+41 | 
+42 | # Edge cases with different quote styles
+
+DJ101 [*] URL route `/single-quote/` has an unnecessary leading slash
+  --> DJ101.py:44:10
+   |
+42 | # Edge cases with different quote styles
+43 | urlpatterns_quotes = [
+44 |     path('/single-quote/', views.single_quote_view),  # DJ101
+   |          ^^^^^^^^^^^^^^^^
+45 |     path("/double-quote/", views.double_quote_view),  # DJ101
+46 |     path('''/triple-single/''', views.triple_single_view),  # DJ101
+   |
+help: Remove leading slash
+41 | 
+42 | # Edge cases with different quote styles
+43 | urlpatterns_quotes = [
+   -     path('/single-quote/', views.single_quote_view),  # DJ101
+44 +     path('single-quote/', views.single_quote_view),  # DJ101
+45 |     path("/double-quote/", views.double_quote_view),  # DJ101
+46 |     path('''/triple-single/''', views.triple_single_view),  # DJ101
+47 |     path("""/triple-double/""", views.triple_double_view),  # DJ101
+
+DJ101 [*] URL route `/double-quote/` has an unnecessary leading slash
+  --> DJ101.py:45:10
+   |
+43 | urlpatterns_quotes = [
+44 |     path('/single-quote/', views.single_quote_view),  # DJ101
+45 |     path("/double-quote/", views.double_quote_view),  # DJ101
+   |          ^^^^^^^^^^^^^^^^
+46 |     path('''/triple-single/''', views.triple_single_view),  # DJ101
+47 |     path("""/triple-double/""", views.triple_double_view),  # DJ101
+   |
+help: Remove leading slash
+42 | # Edge cases with different quote styles
+43 | urlpatterns_quotes = [
+44 |     path('/single-quote/', views.single_quote_view),  # DJ101
+   -     path("/double-quote/", views.double_quote_view),  # DJ101
+45 +     path("double-quote/", views.double_quote_view),  # DJ101
+46 |     path('''/triple-single/''', views.triple_single_view),  # DJ101
+47 |     path("""/triple-double/""", views.triple_double_view),  # DJ101
+48 | ]
+
+DJ101 [*] URL route `/triple-single/` has an unnecessary leading slash
+  --> DJ101.py:46:10
+   |
+44 |     path('/single-quote/', views.single_quote_view),  # DJ101
+45 |     path("/double-quote/", views.double_quote_view),  # DJ101
+46 |     path('''/triple-single/''', views.triple_single_view),  # DJ101
+   |          ^^^^^^^^^^^^^^^^^^^^^
+47 |     path("""/triple-double/""", views.triple_double_view),  # DJ101
+48 | ]
+   |
+help: Remove leading slash
+43 | urlpatterns_quotes = [
+44 |     path('/single-quote/', views.single_quote_view),  # DJ101
+45 |     path("/double-quote/", views.double_quote_view),  # DJ101
+   -     path('''/triple-single/''', views.triple_single_view),  # DJ101
+46 +     path('''triple-single/''', views.triple_single_view),  # DJ101
+47 |     path("""/triple-double/""", views.triple_double_view),  # DJ101
+48 | ]
+49 | 
+
+DJ101 [*] URL route `/triple-double/` has an unnecessary leading slash
+  --> DJ101.py:47:10
+   |
+45 |     path("/double-quote/", views.double_quote_view),  # DJ101
+46 |     path('''/triple-single/''', views.triple_single_view),  # DJ101
+47 |     path("""/triple-double/""", views.triple_double_view),  # DJ101
+   |          ^^^^^^^^^^^^^^^^^^^^^
+48 | ]
+   |
+help: Remove leading slash
+44 |     path('/single-quote/', views.single_quote_view),  # DJ101
+45 |     path("/double-quote/", views.double_quote_view),  # DJ101
+46 |     path('''/triple-single/''', views.triple_single_view),  # DJ101
+   -     path("""/triple-double/""", views.triple_double_view),  # DJ101
+47 +     path("""triple-double/""", views.triple_double_view),  # DJ101
+48 | ]
+49 | 
+50 | # Error - leading trail slash and argument should stay in message
+
+DJ101 [*] URL route `/bad/<slug:slug>/` has an unnecessary leading slash
+  --> DJ101.py:52:10
+   |
+50 | # Error - leading trail slash and argument should stay in message
+51 | urlpatterns_params_bad = [
+52 |     path("/bad/<slug:slug>/", views.bad_view),  # DJ101
+   |          ^^^^^^^^^^^^^^^^^^^
+53 |     path("/<slug:slug>", views.bad_view),  # DJ101
+54 | ]
+   |
+help: Remove leading slash
+49 | 
+50 | # Error - leading trail slash and argument should stay in message
+51 | urlpatterns_params_bad = [
+   -     path("/bad/<slug:slug>/", views.bad_view),  # DJ101
+52 +     path("bad/<slug:slug>/", views.bad_view),  # DJ101
+53 |     path("/<slug:slug>", views.bad_view),  # DJ101
+54 | ]
+
+DJ101 [*] URL route `/<slug:slug>` has an unnecessary leading slash
+  --> DJ101.py:53:10
+   |
+51 | urlpatterns_params_bad = [
+52 |     path("/bad/<slug:slug>/", views.bad_view),  # DJ101
+53 |     path("/<slug:slug>", views.bad_view),  # DJ101
+   |          ^^^^^^^^^^^^^^
+54 | ]
+   |
+help: Remove leading slash
+50 | # Error - leading trail slash and argument should stay in message
+51 | urlpatterns_params_bad = [
+52 |     path("/bad/<slug:slug>/", views.bad_view),  # DJ101
+   -     path("/<slug:slug>", views.bad_view),  # DJ101
+53 +     path("<slug:slug>", views.bad_view),  # DJ101
+54 | ]

crates/ruff_linter/src/rules/flake8_django/snapshots/ruff_linter__rules__flake8_django__tests__DJ101_custom_paths.py.snap

@@ -0,0 +1,81 @@
+---
+source: crates/ruff_linter/src/rules/flake8_django/mod.rs
+---
+DJ101 [*] URL route `/help/` has an unnecessary leading slash
+ --> DJ101_custom_paths.py:6:12
+  |
+4 | # Test that custom path functions are also checked for leading slashes
+5 | urlpatterns_custom = [
+6 |     mypath("/help/", views.help_view),  # DJ101
+  |            ^^^^^^^^
+7 |     mypath("/about/", views.about_view),  # DJ101
+8 | ]
+  |
+help: Remove leading slash
+3 | 
+4 | # Test that custom path functions are also checked for leading slashes
+5 | urlpatterns_custom = [
+  -     mypath("/help/", views.help_view),  # DJ101
+6 +     mypath("help/", views.help_view),  # DJ101
+7 |     mypath("/about/", views.about_view),  # DJ101
+8 | ]
+9 | 
+
+DJ101 [*] URL route `/about/` has an unnecessary leading slash
+ --> DJ101_custom_paths.py:7:12
+  |
+5 | urlpatterns_custom = [
+6 |     mypath("/help/", views.help_view),  # DJ101
+7 |     mypath("/about/", views.about_view),  # DJ101
+  |            ^^^^^^^^^
+8 | ]
+  |
+help: Remove leading slash
+4  | # Test that custom path functions are also checked for leading slashes
+5  | urlpatterns_custom = [
+6  |     mypath("/help/", views.help_view),  # DJ101
+   -     mypath("/about/", views.about_view),  # DJ101
+7  +     mypath("about/", views.about_view),  # DJ101
+8  | ]
+9  | 
+10 | # OK - custom path without leading slash
+
+DJ101 [*] URL route `/api/users/` has an unnecessary leading slash
+  --> DJ101_custom_paths.py:18:12
+   |
+16 | # Test multiple violations in same list
+17 | urlpatterns_multiple = [
+18 |     mypath("/api/users/", views.users_view),  # DJ101
+   |            ^^^^^^^^^^^^^
+19 |     mypath("/api/posts/", views.posts_view),  # DJ101
+20 |     mypath("api/comments/", views.comments_view),  # OK
+   |
+help: Remove leading slash
+15 | 
+16 | # Test multiple violations in same list
+17 | urlpatterns_multiple = [
+   -     mypath("/api/users/", views.users_view),  # DJ101
+18 +     mypath("api/users/", views.users_view),  # DJ101
+19 |     mypath("/api/posts/", views.posts_view),  # DJ101
+20 |     mypath("api/comments/", views.comments_view),  # OK
+21 | ]
+
+DJ101 [*] URL route `/api/posts/` has an unnecessary leading slash
+  --> DJ101_custom_paths.py:19:12
+   |
+17 | urlpatterns_multiple = [
+18 |     mypath("/api/users/", views.users_view),  # DJ101
+19 |     mypath("/api/posts/", views.posts_view),  # DJ101
+   |            ^^^^^^^^^^^^^
+20 |     mypath("api/comments/", views.comments_view),  # OK
+21 | ]
+   |
+help: Remove leading slash
+16 | # Test multiple violations in same list
+17 | urlpatterns_multiple = [
+18 |     mypath("/api/users/", views.users_view),  # DJ101
+   -     mypath("/api/posts/", views.posts_view),  # DJ101
+19 +     mypath("api/posts/", views.posts_view),  # DJ101
+20 |     mypath("api/comments/", views.comments_view),  # OK
+21 | ]
+22 |

crates/ruff_linter/src/settings/mod.rs

@@ -17,7 +17,7 @@ use crate::line_width::LineLength;
 use crate::registry::{Linter, Rule};
 use crate::rules::{
     flake8_annotations, flake8_bandit, flake8_boolean_trap, flake8_bugbear, flake8_builtins,
-    flake8_comprehensions, flake8_copyright, flake8_errmsg, flake8_gettext,
+    flake8_comprehensions, flake8_copyright, flake8_django, flake8_errmsg, flake8_gettext,
     flake8_implicit_str_concat, flake8_import_conventions, flake8_pytest_style, flake8_quotes,
     flake8_self, flake8_tidy_imports, flake8_type_checking, flake8_unused_arguments, isort, mccabe,
     pep8_naming, pycodestyle, pydoclint, pydocstyle, pyflakes, pylint, pyupgrade, ruff,
@@ -262,6 +262,7 @@ pub struct LinterSettings {
     pub flake8_builtins: flake8_builtins::settings::Settings,
     pub flake8_comprehensions: flake8_comprehensions::settings::Settings,
     pub flake8_copyright: flake8_copyright::settings::Settings,
+    pub flake8_django: flake8_django::settings::Settings,
     pub flake8_errmsg: flake8_errmsg::settings::Settings,
     pub flake8_gettext: flake8_gettext::settings::Settings,
     pub flake8_implicit_str_concat: flake8_implicit_str_concat::settings::Settings,
@@ -337,6 +338,7 @@ impl Display for LinterSettings {
                 self.flake8_pytest_style | nested,
                 self.flake8_quotes | nested,
                 self.flake8_self | nested,
+                self.flake8_django | nested,
                 self.flake8_tidy_imports | nested,
                 self.flake8_type_checking | nested,
                 self.flake8_unused_arguments | nested,
@@ -438,6 +440,7 @@ impl LinterSettings {
             flake8_pytest_style: flake8_pytest_style::settings::Settings::default(),
             flake8_quotes: flake8_quotes::settings::Settings::default(),
             flake8_self: flake8_self::settings::Settings::default(),
+            flake8_django: flake8_django::settings::Settings::default(),
             flake8_tidy_imports: flake8_tidy_imports::settings::Settings::default(),
             flake8_type_checking: flake8_type_checking::settings::Settings::default(),
             flake8_unused_arguments: flake8_unused_arguments::settings::Settings::default(),

crates/ruff_workspace/src/configuration.rs

@@ -47,7 +47,7 @@ use ruff_python_formatter::{
 use crate::options::{
     AnalyzeOptions, Flake8AnnotationsOptions, Flake8BanditOptions, Flake8BooleanTrapOptions,
     Flake8BugbearOptions, Flake8BuiltinsOptions, Flake8ComprehensionsOptions,
-    Flake8CopyrightOptions, Flake8ErrMsgOptions, Flake8GetTextOptions,
+    Flake8CopyrightOptions, Flake8DjangoOptions, Flake8ErrMsgOptions, Flake8GetTextOptions,
     Flake8ImplicitStrConcatOptions, Flake8ImportConventionsOptions, Flake8PytestStyleOptions,
     Flake8QuotesOptions, Flake8SelfOptions, Flake8TidyImportsOptions, Flake8TypeCheckingOptions,
     Flake8UnusedArgumentsOptions, FormatOptions, IsortOptions, LintCommonOptions, LintOptions,
@@ -366,6 +366,10 @@ impl Configuration {
                     .map(Flake8CopyrightOptions::try_into_settings)
                     .transpose()?
                     .unwrap_or_default(),
+                flake8_django: lint
+                    .flake8_django
+                    .map(Flake8DjangoOptions::into_settings)
+                    .unwrap_or_default(),
                 flake8_errmsg: lint
                     .flake8_errmsg
                     .map(Flake8ErrMsgOptions::into_settings)
@@ -662,6 +666,7 @@ pub struct LintConfiguration {
     pub flake8_builtins: Option<Flake8BuiltinsOptions>,
     pub flake8_comprehensions: Option<Flake8ComprehensionsOptions>,
     pub flake8_copyright: Option<Flake8CopyrightOptions>,
+    pub flake8_django: Option<Flake8DjangoOptions>,
     pub flake8_errmsg: Option<Flake8ErrMsgOptions>,
     pub flake8_gettext: Option<Flake8GetTextOptions>,
     pub flake8_implicit_str_concat: Option<Flake8ImplicitStrConcatOptions>,
@@ -779,6 +784,7 @@ impl LintConfiguration {
             flake8_builtins: options.common.flake8_builtins,
             flake8_comprehensions: options.common.flake8_comprehensions,
             flake8_copyright: options.common.flake8_copyright,
+            flake8_django: options.common.flake8_django,
             flake8_errmsg: options.common.flake8_errmsg,
             flake8_gettext: options.common.flake8_gettext,
             flake8_implicit_str_concat: options.common.flake8_implicit_str_concat,
@@ -1168,6 +1174,7 @@ impl LintConfiguration {
                 .flake8_comprehensions
                 .combine(config.flake8_comprehensions),
             flake8_copyright: self.flake8_copyright.combine(config.flake8_copyright),
+            flake8_django: self.flake8_django.combine(config.flake8_django),
             flake8_errmsg: self.flake8_errmsg.combine(config.flake8_errmsg),
             flake8_gettext: self.flake8_gettext.combine(config.flake8_gettext),
             flake8_implicit_str_concat: self
@@ -1394,6 +1401,7 @@ fn warn_about_deprecated_top_level_lint_options(
         flake8_builtins,
         flake8_comprehensions,
         flake8_copyright,
+        flake8_django,
         flake8_errmsg,
         flake8_quotes,
         flake8_self,
@@ -1517,6 +1525,10 @@ fn warn_about_deprecated_top_level_lint_options(
         used_options.push("flake8-copyright");
     }
 
+    if flake8_django.is_some() {
+        used_options.push("flake8-django");
+    }
+
     if flake8_errmsg.is_some() {
         used_options.push("flake8-errmsg");
     }

crates/ruff_workspace/src/options.rs

@@ -22,7 +22,7 @@ use ruff_linter::rules::pep8_naming::settings::IgnoreNames;
 use ruff_linter::rules::pydocstyle::settings::Convention;
 use ruff_linter::rules::pylint::settings::ConstantType;
 use ruff_linter::rules::{
-    flake8_copyright, flake8_errmsg, flake8_gettext, flake8_implicit_str_concat,
+    flake8_copyright, flake8_django, flake8_errmsg, flake8_gettext, flake8_implicit_str_concat,
     flake8_import_conventions, flake8_pytest_style, flake8_quotes, flake8_self,
     flake8_tidy_imports, flake8_type_checking, flake8_unused_arguments, isort, mccabe, pep8_naming,
     pycodestyle, pydoclint, pydocstyle, pyflakes, pylint, pyupgrade, ruff,
@@ -900,6 +900,10 @@ pub struct LintCommonOptions {
     #[option_group]
     pub flake8_copyright: Option<Flake8CopyrightOptions>,
 
+    /// Options for the `flake8-django` plugin.
+    #[option_group]
+    pub flake8_django: Option<Flake8DjangoOptions>,
+
     /// Options for the `flake8-errmsg` plugin.
     #[option_group]
     pub flake8_errmsg: Option<Flake8ErrMsgOptions>,
@@ -1431,6 +1435,39 @@ impl Flake8CopyrightOptions {
     }
 }
 
+/// Options for the `flake8-django` plugin.
+#[derive(
+    Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
+)]
+#[serde(deny_unknown_fields, rename_all = "kebab-case")]
+#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
+pub struct Flake8DjangoOptions {
+    /// Additional qualified paths to Django URL path functions beyond
+    /// the default `django.urls.path`. This allows the rule to check
+    /// URL patterns defined using custom path functions or re-exported
+    /// path functions from other modules.
+    ///
+    /// For example, if you have a custom module `mytools` that re-exports
+    /// Django's path function, you can add `"mytools.path"` to this list.
+    #[option(
+        default = "[]",
+        value_type = "list[str]",
+        example = r#"
+            # Allow checking URL patterns from custom path functions
+            additional-path-functions = ["mytools.path", "myapp.urls.custom_path"]
+        "#
+    )]
+    pub additional_path_functions: Option<Vec<String>>,
+}
+
+impl Flake8DjangoOptions {
+    pub fn into_settings(self) -> flake8_django::settings::Settings {
+        flake8_django::settings::Settings {
+            additional_path_functions: self.additional_path_functions.unwrap_or_default(),
+        }
+    }
+}
+
 /// Options for the `flake8-errmsg` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
@@ -3937,6 +3974,7 @@ pub struct LintOptionsWire {
     flake8_builtins: Option<Flake8BuiltinsOptions>,
     flake8_comprehensions: Option<Flake8ComprehensionsOptions>,
     flake8_copyright: Option<Flake8CopyrightOptions>,
+    flake8_django: Option<Flake8DjangoOptions>,
     flake8_errmsg: Option<Flake8ErrMsgOptions>,
     flake8_quotes: Option<Flake8QuotesOptions>,
     flake8_self: Option<Flake8SelfOptions>,
@@ -3994,6 +4032,7 @@ impl From<LintOptionsWire> for LintOptions {
             flake8_builtins,
             flake8_comprehensions,
             flake8_copyright,
+            flake8_django,
             flake8_errmsg,
             flake8_quotes,
             flake8_self,
@@ -4050,6 +4089,7 @@ impl From<LintOptionsWire> for LintOptions {
                 flake8_builtins,
                 flake8_comprehensions,
                 flake8_copyright,
+                flake8_django,
                 flake8_errmsg,
                 flake8_quotes,
                 flake8_self,

ruff.schema.json

@@ -297,6 +297,18 @@
       ],
       "deprecated": true
     },
+    "flake8-django": {
+      "description": "Options for the `flake8-django` plugin.",
+      "anyOf": [
+        {
+          "$ref": "#/definitions/Flake8DjangoOptions"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "deprecated": true
+    },
     "flake8-errmsg": {
       "description": "Options for the `flake8-errmsg` plugin.",
       "anyOf": [
@@ -1145,6 +1157,23 @@
       },
       "additionalProperties": false
     },
+    "Flake8DjangoOptions": {
+      "description": "Options for the `flake8-django` plugin.",
+      "type": "object",
+      "properties": {
+        "additional-path-functions": {
+          "description": "Additional qualified paths to Django URL path functions beyond\nthe default `django.urls.path`. This allows the rule to check\nURL patterns defined using custom path functions or re-exported\npath functions from other modules.\n\nFor example, if you have a custom module `mytools` that re-exports\nDjango's path function, you can add `\"mytools.path\"` to this list.",
+          "type": [
+            "array",
+            "null"
+          ],
+          "items": {
+            "type": "string"
+          }
+        }
+      },
+      "additionalProperties": false
+    },
     "Flake8ErrMsgOptions": {
       "description": "Options for the `flake8-errmsg` plugin.",
       "type": "object",
@@ -2167,6 +2196,17 @@
             }
           ]
         },
+        "flake8-django": {
+          "description": "Options for the `flake8-django` plugin.",
+          "anyOf": [
+            {
+              "$ref": "#/definitions/Flake8DjangoOptions"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
         "flake8-errmsg": {
           "description": "Options for the `flake8-errmsg` plugin.",
           "anyOf": [
@@ -3164,6 +3204,10 @@
         "DJ01",
         "DJ012",
         "DJ013",
+        "DJ1",
+        "DJ10",
+        "DJ100",
+        "DJ101",
         "DOC",
         "DOC1",
         "DOC10",