introspection.py 文件源码

def sequence_list(self):
        "Returns a list of information about all DB sequences for all models in all apps."
        from django.apps import apps
        from django.db import models, router

        sequence_list = []

        for app_config in apps.get_app_configs():
            for model in router.get_migratable_models(app_config, self.connection.alias):
                if not model._meta.managed:
                    continue
                if model._meta.swapped:
                    continue
                for f in model._meta.local_fields:
                    if isinstance(f, models.AutoField):
                        sequence_list.append({'table': model._meta.db_table, 'column': f.column})
                        break  # Only one AutoField is allowed per model, so don't bother continuing.

                for f in model._meta.local_many_to_many:
                    # If this is an m2m using an intermediate table,
                    # we don't need to reset the sequence.
                    if f.remote_field.through is None:
                        sequence_list.append({'table': f.m2m_db_table(), 'column': None})

        return sequence_list