diff --git a/django/db/backends/base/schema.py b/django/db/backends/base/schema.py index 38136e7213..e5f28d9c6a 100644 --- a/django/db/backends/base/schema.py +++ b/django/db/backends/base/schema.py @@ -1582,12 +1582,23 @@ class BaseDatabaseSchemaEditor: ) def _delete_index_sql(self, model, name, sql=None): - return Statement( + statement = Statement( sql or self.sql_delete_index, table=Table(model._meta.db_table, self.quote_name), name=self.quote_name(name), ) + # Remove all deferred statements referencing the deleted index. + table_name = statement.parts["table"].table + index_name = statement.parts["name"] + for sql in list(self.deferred_sql): + if isinstance(sql, Statement) and sql.references_index( + table_name, index_name + ): + self.deferred_sql.remove(sql) + + return statement + def _rename_index_sql(self, model, old_name, new_name): return Statement( self.sql_rename_index, diff --git a/django/db/backends/ddl_references.py b/django/db/backends/ddl_references.py index 75787ef8ab..cb8d2defd2 100644 --- a/django/db/backends/ddl_references.py +++ b/django/db/backends/ddl_references.py @@ -21,6 +21,12 @@ class Reference: """ return False + def references_index(self, table, index): + """ + Return whether or not this instance references the specified index. + """ + return False + def rename_table_references(self, old_table, new_table): """ Rename all references to the old_name to the new_table. @@ -52,6 +58,9 @@ class Table(Reference): def references_table(self, table): return self.table == table + def references_index(self, table, index): + return self.references_table(table) and str(self) == index + def rename_table_references(self, old_table, new_table): if self.table == old_table: self.table = new_table @@ -207,6 +216,12 @@ class Statement(Reference): for part in self.parts.values() ) + def references_index(self, table, index): + return any( + hasattr(part, "references_index") and part.references_index(table, index) + for part in self.parts.values() + ) + def rename_table_references(self, old_table, new_table): for part in self.parts.values(): if hasattr(part, "rename_table_references"): diff --git a/tests/backends/test_ddl_references.py b/tests/backends/test_ddl_references.py index 86984ed3e8..8975b97124 100644 --- a/tests/backends/test_ddl_references.py +++ b/tests/backends/test_ddl_references.py @@ -166,10 +166,13 @@ class ForeignKeyNameTests(IndexNameTests): class MockReference: - def __init__(self, representation, referenced_tables, referenced_columns): + def __init__( + self, representation, referenced_tables, referenced_columns, referenced_indexes + ): self.representation = representation self.referenced_tables = referenced_tables self.referenced_columns = referenced_columns + self.referenced_indexes = referenced_indexes def references_table(self, table): return table in self.referenced_tables @@ -177,6 +180,9 @@ class MockReference: def references_column(self, table, column): return (table, column) in self.referenced_columns + def references_index(self, table, index): + return (table, index) in self.referenced_indexes + def rename_table_references(self, old_table, new_table): if old_table in self.referenced_tables: self.referenced_tables.remove(old_table) @@ -195,32 +201,43 @@ class MockReference: class StatementTests(SimpleTestCase): def test_references_table(self): statement = Statement( - "", reference=MockReference("", {"table"}, {}), non_reference="" + "", reference=MockReference("", {"table"}, {}, {}), non_reference="" ) self.assertIs(statement.references_table("table"), True) self.assertIs(statement.references_table("other"), False) def test_references_column(self): statement = Statement( - "", reference=MockReference("", {}, {("table", "column")}), non_reference="" + "", + reference=MockReference("", {}, {("table", "column")}, {}), + non_reference="", ) self.assertIs(statement.references_column("table", "column"), True) self.assertIs(statement.references_column("other", "column"), False) + def test_references_index(self): + statement = Statement( + "", + reference=MockReference("", {}, {}, {("table", "index")}), + non_reference="", + ) + self.assertIs(statement.references_index("table", "index"), True) + self.assertIs(statement.references_index("other", "index"), False) + def test_rename_table_references(self): - reference = MockReference("", {"table"}, {}) + reference = MockReference("", {"table"}, {}, {}) statement = Statement("", reference=reference, non_reference="") statement.rename_table_references("table", "other") self.assertEqual(reference.referenced_tables, {"other"}) def test_rename_column_references(self): - reference = MockReference("", {}, {("table", "column")}) + reference = MockReference("", {}, {("table", "column")}, {}) statement = Statement("", reference=reference, non_reference="") statement.rename_column_references("table", "column", "other") self.assertEqual(reference.referenced_columns, {("table", "other")}) def test_repr(self): - reference = MockReference("reference", {}, {}) + reference = MockReference("reference", {}, {}, {}) statement = Statement( "%(reference)s - %(non_reference)s", reference=reference, @@ -229,7 +246,7 @@ class StatementTests(SimpleTestCase): self.assertEqual(repr(statement), "") def test_str(self): - reference = MockReference("reference", {}, {}) + reference = MockReference("reference", {}, {}, {}) statement = Statement( "%(reference)s - %(non_reference)s", reference=reference, diff --git a/tests/indexes/tests.py b/tests/indexes/tests.py index 107703c39a..0c4158a886 100644 --- a/tests/indexes/tests.py +++ b/tests/indexes/tests.py @@ -3,7 +3,7 @@ from unittest import skipUnless from django.conf import settings from django.db import connection -from django.db.models import CASCADE, ForeignKey, Index, Q +from django.db.models import CASCADE, CharField, ForeignKey, Index, Q from django.db.models.functions import Lower from django.test import ( TestCase, @@ -87,6 +87,24 @@ class SchemaIndexesTests(TestCase): str(index.create_sql(Article, editor)), ) + @skipUnlessDBFeature("can_create_inline_fk", "can_rollback_ddl") + def test_alter_field_unique_false_removes_deferred_sql(self): + field_added = CharField(max_length=127, unique=True) + field_added.set_attributes_from_name("charfield_added") + + field_to_alter = CharField(max_length=127, unique=True) + field_to_alter.set_attributes_from_name("charfield_altered") + altered_field = CharField(max_length=127, unique=False) + altered_field.set_attributes_from_name("charfield_altered") + + with connection.schema_editor() as editor: + editor.add_field(ArticleTranslation, field_added) + editor.add_field(ArticleTranslation, field_to_alter) + self.assertEqual(len(editor.deferred_sql), 2) + editor.alter_field(ArticleTranslation, field_to_alter, altered_field) + self.assertEqual(len(editor.deferred_sql), 1) + self.assertIn("charfield_added", str(editor.deferred_sql[0].parts["name"])) + class SchemaIndexesNotPostgreSQLTests(TransactionTestCase): available_apps = ["indexes"]