managers.py 文件源码

def drop_constraints_and_indexes(self):
        """
        Temporarily drop constraints and indexes on the model and its fields.
        """
        with connection.schema_editor() as schema_editor:
            schema_editor.alter_unique_together(
                self.model,
                self.model._meta.unique_together,
                (),
            )

            schema_editor.alter_index_together(
                self.model,
                self.model._meta.index_together,
                (),
            )

            for field in self.model.objects.constrained_fields:
                field_copy = field.__copy__()
                field_copy.db_constraint = False
                schema_editor.alter_field(
                    self.model, field, field_copy
                )

            for field in self.model.objects.indexed_fields:
                field_copy = field.__copy__()
                field_copy.db_index = False
                schema_editor.alter_field(
                    self.model, field, field_copy
                )