Method remove_sql

django/db/models/constraints.py:209–210

(self, model, schema_editor)

        return schema_editor._create_check_sql(model, self.name, check)

    def remove_sql(self, model, schema_editor):
        return schema_editor._delete_check_sql(model, self.name)

    def validate(self, model, instance, exclude=None, using=DEFAULT_DB_ALIAS):
        against = instance._get_field_expression_map(meta=model._meta, exclude=exclude)