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Refs #32502 -- Avoided table rebuild when adding fields with no default on SQLite.

This commit is contained in:
Mariusz Felisiak 2021-12-10 11:12:04 +01:00
parent 57f0638573
commit 2f73e5406d
2 changed files with 18 additions and 8 deletions
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15
django/db/backends/sqlite3/schema.py
View File

@ -15,6 +15,7 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
sql_delete_table = "DROP TABLE %(table)s" sql_delete_table = "DROP TABLE %(table)s"
sql_create_fk = None sql_create_fk = None
sql_create_inline_fk = "REFERENCES %(to_table)s (%(to_column)s) DEFERRABLE INITIALLY DEFERRED" sql_create_inline_fk = "REFERENCES %(to_table)s (%(to_column)s) DEFERRABLE INITIALLY DEFERRED"
sql_create_column_inline_fk = sql_create_inline_fk
sql_create_unique = "CREATE UNIQUE INDEX %(name)s ON %(table)s (%(columns)s)" sql_create_unique = "CREATE UNIQUE INDEX %(name)s ON %(table)s (%(columns)s)"
sql_delete_unique = "DROP INDEX %(name)s" sql_delete_unique = "DROP INDEX %(name)s"
@ -322,14 +323,14 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
self.deferred_sql.remove(sql) self.deferred_sql.remove(sql)
def add_field(self, model, field): def add_field(self, model, field):
""" """Create a field on a model."""
Create a field on a model. Usually involves adding a column, but may # Fields with default values cannot by handled by ALTER TABLE ADD
involve adding a table instead (for M2M fields). # COLUMN statement because DROP DEFAULT is not supported in
""" # ALTER TABLE.
# Special-case implicit M2M tables if not field.null or self.effective_default(field) is not None:
if field.many_to_many and field.remote_field.through._meta.auto_created:
return self.create_model(field.remote_field.through)
self._remake_table(model, create_field=field) self._remake_table(model, create_field=field)
else:
super().add_field(model, field)
def remove_field(self, model, field): def remove_field(self, model, field):
""" """

9
tests/schema/tests.py
View File

@ -517,6 +517,15 @@ class SchemaTests(TransactionTestCase):
'column': editor.quote_name(new_field.name), 'column': editor.quote_name(new_field.name),
} }
self.assertFalse(any(drop_default_sql in query['sql'] for query in ctx.captured_queries)) self.assertFalse(any(drop_default_sql in query['sql'] for query in ctx.captured_queries))
# Table is not rebuilt.
self.assertIs(any(
'CREATE TABLE' in query['sql']
for query in ctx.captured_queries
), False)
self.assertIs(any(
'DROP TABLE' in query['sql']
for query in ctx.captured_queries
), False)
columns = self.column_classes(Author) columns = self.column_classes(Author)
self.assertEqual(columns['age'][0], connection.features.introspected_field_types['IntegerField']) self.assertEqual(columns['age'][0], connection.features.introspected_field_types['IntegerField'])
self.assertTrue(columns['age'][1][6]) self.assertTrue(columns['age'][1][6])