Apply nullable-model-string-field to all classes (#2928)

crates/ruff/resources/test/fixtures/flake8_django/DJ001.py

@@ -12,7 +12,16 @@ class IncorrectModel(models.Model):
     urlfield = models.URLField(max_length=255, null=True)
 
 
-class IncorrectModelWithAliasedBase(DjangoModel):
+class IncorrectModelWithAlias(DjangoModel):
+    charfield = DjangoModel.CharField(max_length=255, null=True)
+    textfield = SmthCharField(max_length=255, null=True)
+    slugfield = models.SlugField(max_length=255, null=True)
+    emailfield = models.EmailField(max_length=255, null=True)
+    filepathfield = models.FilePathField(max_length=255, null=True)
+    urlfield = models.URLField(max_length=255, null=True)
+
+
+class IncorrectModelWithoutSuperclass:
     charfield = DjangoModel.CharField(max_length=255, null=True)
     textfield = SmthCharField(max_length=255, null=True)
     slugfield = models.SlugField(max_length=255, null=True)

crates/ruff/src/checkers/ast.rs

@@ -786,7 +786,7 @@ where
                 if self.settings.rules.enabled(&Rule::NullableModelStringField) {
                     self.diagnostics
                         .extend(flake8_django::rules::nullable_model_string_field(
-                            self, bases, body,
+                            self, body,
                         ));
                 }
                 if self.settings.rules.enabled(&Rule::ModelWithoutDunderStr) {

crates/ruff/src/rules/flake8_django/rules/nullable_model_string_field.rs

@@ -1,11 +1,14 @@
-use super::helpers;
+use rustpython_parser::ast::Constant::Bool;
+use rustpython_parser::ast::{Expr, ExprKind, Stmt, StmtKind};
+
+use ruff_macros::{define_violation, derive_message_formats};
+
 use crate::ast::types::Range;
 use crate::checkers::ast::Checker;
 use crate::registry::Diagnostic;
 use crate::violation::Violation;
-use ruff_macros::{define_violation, derive_message_formats};
+
-use rustpython_parser::ast::Constant::Bool;
+use super::helpers;
-use rustpython_parser::ast::{Expr, ExprKind, Stmt, StmtKind};
 
 define_violation!(
     /// ## What it does
@@ -58,21 +61,13 @@ const NOT_NULL_TRUE_FIELDS: [&str; 6] = [
 ];
 
 /// DJ001
-pub fn nullable_model_string_field(
+pub fn nullable_model_string_field(checker: &Checker, body: &[Stmt]) -> Vec<Diagnostic> {
-    checker: &Checker,
-    bases: &[Expr],
-    body: &[Stmt],
-) -> Vec<Diagnostic> {
-    if !bases.iter().any(|base| helpers::is_model(checker, base)) {
-        return vec![];
-    }
-
     let mut errors = Vec::new();
     for statement in body.iter() {
         let StmtKind::Assign {value, ..} = &statement.node else {
             continue
         };
-        if let Some(field_name) = check_nullable_field(checker, value) {
+        if let Some(field_name) = is_nullable_field(checker, value) {
             errors.push(Diagnostic::new(
                 NullableModelStringField {
                     field_name: field_name.to_string(),
@@ -84,7 +79,7 @@ pub fn nullable_model_string_field(
     errors
 }
 
-fn check_nullable_field<'a>(checker: &'a Checker, value: &'a Expr) -> Option<&'a str> {
+fn is_nullable_field<'a>(checker: &'a Checker, value: &'a Expr) -> Option<&'a str> {
     let ExprKind::Call {func, keywords, ..} = &value.node else {
         return None;
     };

crates/ruff/src/rules/flake8_django/snapshots/ruff__rules__flake8_django__tests__DJ001_DJ001.py.snap

@@ -134,4 +134,70 @@ expression: diagnostics
     column: 57
   fix: ~
   parent: ~
+- kind:
+    NullableModelStringField:
+      field_name: CharField
+  location:
+    row: 25
+    column: 16
+  end_location:
+    row: 25
+    column: 64
+  fix: ~
+  parent: ~
+- kind:
+    NullableModelStringField:
+      field_name: CharField
+  location:
+    row: 26
+    column: 16
+  end_location:
+    row: 26
+    column: 56
+  fix: ~
+  parent: ~
+- kind:
+    NullableModelStringField:
+      field_name: SlugField
+  location:
+    row: 27
+    column: 16
+  end_location:
+    row: 27
+    column: 59
+  fix: ~
+  parent: ~
+- kind:
+    NullableModelStringField:
+      field_name: EmailField
+  location:
+    row: 28
+    column: 17
+  end_location:
+    row: 28
+    column: 61
+  fix: ~
+  parent: ~
+- kind:
+    NullableModelStringField:
+      field_name: FilePathField
+  location:
+    row: 29
+    column: 20
+  end_location:
+    row: 29
+    column: 67
+  fix: ~
+  parent: ~
+- kind:
+    NullableModelStringField:
+      field_name: URLField
+  location:
+    row: 30
+    column: 15
+  end_location:
+    row: 30
+    column: 57
+  fix: ~
+  parent: ~