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Fixed #35180 -- Recreated PostgreSQL _like indexes when changing between TextField and CharField field types.

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This commit is contained in:
Ben Cail 2024-09-17 15:10:39 -04:00 committed by Sarah Boyce
parent b50d1a020d
commit 0eaaadd47f
2 changed files with 61 additions and 7 deletions
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23
django/db/backends/postgresql/schema.py
View File

@ -140,6 +140,13 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
return sequence["name"]
return None
def _is_changing_type_of_indexed_text_column(self, old_field, old_type, new_type):
return (old_field.db_index or old_field.unique) and (
(old_type.startswith("varchar") and not new_type.startswith("varchar"))
or (old_type.startswith("text") and not new_type.startswith("text"))
or (old_type.startswith("citext") and not new_type.startswith("citext"))
)
def _alter_column_type_sql(
self, model, old_field, new_field, new_type, old_collation, new_collation
):
@ -147,11 +154,7 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
# different type.
old_db_params = old_field.db_parameters(connection=self.connection)
old_type = old_db_params["type"]
if (old_field.db_index or old_field.unique) and (
(old_type.startswith("varchar") and not new_type.startswith("varchar"))
or (old_type.startswith("text") and not new_type.startswith("text"))
or (old_type.startswith("citext") and not new_type.startswith("citext"))
):
if self._is_changing_type_of_indexed_text_column(old_field, old_type, new_type):
index_name = self._create_index_name(
model._meta.db_table, [old_field.column], suffix="_like"
)
@ -277,8 +280,14 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
strict,
)
# Added an index? Create any PostgreSQL-specific indexes.
if (not (old_field.db_index or old_field.unique) and new_field.db_index) or (
not old_field.unique and new_field.unique
if (
(not (old_field.db_index or old_field.unique) and new_field.db_index)
or (not old_field.unique and new_field.unique)
or (
self._is_changing_type_of_indexed_text_column(
old_field, old_type, new_type
)
)
):
like_index_statement = self._create_like_index_sql(model, new_field)
if like_index_statement is not None:

45
tests/schema/tests.py
View File

@ -5223,6 +5223,51 @@ class SchemaTests(TransactionTestCase):
["schema_tag_slug_2c418ba3_like", "schema_tag_slug_key"],
)
@isolate_apps("schema")
@unittest.skipUnless(connection.vendor == "postgresql", "PostgreSQL specific")
def test_indexed_charfield_to_textfield(self):
class SimpleModel(Model):
field1 = CharField(max_length=10, db_index=True)
class Meta:
app_label = "schema"
with connection.schema_editor() as editor:
editor.create_model(SimpleModel)
self.assertEqual(
self.get_constraints_for_column(SimpleModel, "field1"),
[
"schema_simplemodel_field1_f07a3d6a",
"schema_simplemodel_field1_f07a3d6a_like",
],
)
# Change to TextField.
old_field1 = SimpleModel._meta.get_field("field1")
new_field1 = TextField(db_index=True)
new_field1.set_attributes_from_name("field1")
with connection.schema_editor() as editor:
editor.alter_field(SimpleModel, old_field1, new_field1, strict=True)
self.assertEqual(
self.get_constraints_for_column(SimpleModel, "field1"),
[
"schema_simplemodel_field1_f07a3d6a",
"schema_simplemodel_field1_f07a3d6a_like",
],
)
# Change back to CharField.
old_field1 = SimpleModel._meta.get_field("field1")
new_field1 = CharField(max_length=10, db_index=True)
new_field1.set_attributes_from_name("field1")
with connection.schema_editor() as editor:
editor.alter_field(SimpleModel, old_field1, new_field1, strict=True)
self.assertEqual(
self.get_constraints_for_column(SimpleModel, "field1"),
[
"schema_simplemodel_field1_f07a3d6a",
"schema_simplemodel_field1_f07a3d6a_like",
],
)
def test_alter_field_add_index_to_integerfield(self):
# Create the table and verify no initial indexes.
with connection.schema_editor() as editor: