Fixed #30183 -- Added introspection of inline SQLite constraints.

tests/backends/sqlite/test_introspection.py

@@ -1,5 +1,7 @@
 import unittest
 
+import sqlparse
+
 from django.db import connection
 from django.test import TestCase
 
@@ -25,3 +27,116 @@ class IntrospectionTests(TestCase):
                         self.assertEqual(field, expected_string)
                     finally:
                         cursor.execute('DROP TABLE test_primary')
+
+
+@unittest.skipUnless(connection.vendor == 'sqlite', 'SQLite tests')
+class ParsingTests(TestCase):
+    def parse_definition(self, sql, columns):
+        """Parse a column or constraint definition."""
+        statement = sqlparse.parse(sql)[0]
+        tokens = (token for token in statement.flatten() if not token.is_whitespace)
+        with connection.cursor():
+            return connection.introspection._parse_column_or_constraint_definition(tokens, set(columns))
+
+    def assertConstraint(self, constraint_details, cols, unique=False, check=False):
+        self.assertEqual(constraint_details, {
+            'unique': unique,
+            'columns': cols,
+            'primary_key': False,
+            'foreign_key': None,
+            'check': check,
+            'index': False,
+        })
+
+    def test_unique_column(self):
+        tests = (
+            ('"ref" integer UNIQUE,', ['ref']),
+            ('ref integer UNIQUE,', ['ref']),
+            ('"customname" integer UNIQUE,', ['customname']),
+            ('customname integer UNIQUE,', ['customname']),
+        )
+        for sql, columns in tests:
+            with self.subTest(sql=sql):
+                constraint, details, check, _ = self.parse_definition(sql, columns)
+                self.assertIsNone(constraint)
+                self.assertConstraint(details, columns, unique=True)
+                self.assertIsNone(check)
+
+    def test_unique_constraint(self):
+        tests = (
+            ('CONSTRAINT "ref" UNIQUE ("ref"),', 'ref', ['ref']),
+            ('CONSTRAINT ref UNIQUE (ref),', 'ref', ['ref']),
+            ('CONSTRAINT "customname1" UNIQUE ("customname2"),', 'customname1', ['customname2']),
+            ('CONSTRAINT customname1 UNIQUE (customname2),', 'customname1', ['customname2']),
+        )
+        for sql, constraint_name, columns in tests:
+            with self.subTest(sql=sql):
+                constraint, details, check, _ = self.parse_definition(sql, columns)
+                self.assertEqual(constraint, constraint_name)
+                self.assertConstraint(details, columns, unique=True)
+                self.assertIsNone(check)
+
+    def test_unique_constraint_multicolumn(self):
+        tests = (
+            ('CONSTRAINT "ref" UNIQUE ("ref", "customname"),', 'ref', ['ref', 'customname']),
+            ('CONSTRAINT ref UNIQUE (ref, customname),', 'ref', ['ref', 'customname']),
+        )
+        for sql, constraint_name, columns in tests:
+            with self.subTest(sql=sql):
+                constraint, details, check, _ = self.parse_definition(sql, columns)
+                self.assertEqual(constraint, constraint_name)
+                self.assertConstraint(details, columns, unique=True)
+                self.assertIsNone(check)
+
+    def test_check_column(self):
+        tests = (
+            ('"ref" varchar(255) CHECK ("ref" != \'test\'),', ['ref']),
+            ('ref varchar(255) CHECK (ref != \'test\'),', ['ref']),
+            ('"customname1" varchar(255) CHECK ("customname2" != \'test\'),', ['customname2']),
+            ('customname1 varchar(255) CHECK (customname2 != \'test\'),', ['customname2']),
+        )
+        for sql, columns in tests:
+            with self.subTest(sql=sql):
+                constraint, details, check, _ = self.parse_definition(sql, columns)
+                self.assertIsNone(constraint)
+                self.assertIsNone(details)
+                self.assertConstraint(check, columns, check=True)
+
+    def test_check_constraint(self):
+        tests = (
+            ('CONSTRAINT "ref" CHECK ("ref" != \'test\'),', 'ref', ['ref']),
+            ('CONSTRAINT ref CHECK (ref != \'test\'),', 'ref', ['ref']),
+            ('CONSTRAINT "customname1" CHECK ("customname2" != \'test\'),', 'customname1', ['customname2']),
+            ('CONSTRAINT customname1 CHECK (customname2 != \'test\'),', 'customname1', ['customname2']),
+        )
+        for sql, constraint_name, columns in tests:
+            with self.subTest(sql=sql):
+                constraint, details, check, _ = self.parse_definition(sql, columns)
+                self.assertEqual(constraint, constraint_name)
+                self.assertIsNone(details)
+                self.assertConstraint(check, columns, check=True)
+
+    def test_check_column_with_operators_and_functions(self):
+        tests = (
+            ('"ref" integer CHECK ("ref" BETWEEN 1 AND 10),', ['ref']),
+            ('"ref" varchar(255) CHECK ("ref" LIKE \'test%\'),', ['ref']),
+            ('"ref" varchar(255) CHECK (LENGTH(ref) > "max_length"),', ['ref', 'max_length']),
+        )
+        for sql, columns in tests:
+            with self.subTest(sql=sql):
+                constraint, details, check, _ = self.parse_definition(sql, columns)
+                self.assertIsNone(constraint)
+                self.assertIsNone(details)
+                self.assertConstraint(check, columns, check=True)
+
+    def test_check_and_unique_column(self):
+        tests = (
+            ('"ref" varchar(255) CHECK ("ref" != \'test\') UNIQUE,', ['ref']),
+            ('ref varchar(255) UNIQUE CHECK (ref != \'test\'),', ['ref']),
+        )
+        for sql, columns in tests:
+            with self.subTest(sql=sql):
+                constraint, details, check, _ = self.parse_definition(sql, columns)
+                self.assertIsNone(constraint)
+                self.assertConstraint(details, columns, unique=True)
+                self.assertConstraint(check, columns, check=True)