test_field.py 文件源码

def migrate(self, targets):
        """
        Migrate to a new state.

        MigrationExecutors can not be reloaded, as they cache the state of the
        migrations when created. Attempting to reuse one might make some
        migrations not run, as it thinks they have already been run.
        """
        executor = MigrationExecutor(connection)
        executor.migrate(targets)

        # Cant load state for apps in the initial empty state
        state_nodes = [node for node in targets if node[1] is not None]
        return executor.loader.project_state(state_nodes).apps