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Diffstat (limited to 'django/db/backends/base/schema.py')
| -rw-r--r-- | django/db/backends/base/schema.py | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/django/db/backends/base/schema.py b/django/db/backends/base/schema.py index a99218da92..9857eea571 100644 --- a/django/db/backends/base/schema.py +++ b/django/db/backends/base/schema.py @@ -661,6 +661,26 @@ class BaseDatabaseSchemaEditor: } meta_index_names = {constraint.name for constraint in model._meta.indexes} columns = [model._meta.get_field(field).column for field in fields] + + # Check if the constraint is still in deferred_sql. This happens when + # CreateModel with unique_together is followed by AlterUniqueTogether + # in the same migration. index_together is not affected because its + # indexes are created immediately in CreateModel.database_forwards. + is_unique_constraint = constraint_kwargs.get("unique") is True + table = model._meta.db_table + if is_unique_constraint: + for deferred in list(self.deferred_sql): + if ( + isinstance(deferred, Statement) + and deferred.references_table(table) + and all( + deferred.references_column(table, column) for column in columns + ) + and deferred.parts["columns"].columns == columns + ): + self.deferred_sql.remove(deferred) + return + constraint_names = self._constraint_names( model, columns, @@ -668,7 +688,7 @@ class BaseDatabaseSchemaEditor: **constraint_kwargs, ) if ( - constraint_kwargs.get("unique") is True + is_unique_constraint and constraint_names and self.connection.features.allows_multiple_constraints_on_same_fields ): |