如何在Django项目的所有应用程序中获取类的所有模型

我上了模型课 AppModelActions 继承自 CustomModel 继承自 django.db.models 我在项目的所有应用程序中都使用它。

我要获取的所有实例 应用模型动作 在所有应用程序中,来自其中一个应用程序的命令文件。我不能显式地导入每个命令,因为我希望此命令动态工作。我试图以编程方式导入实例,但它不起作用(我得到这个错误:`keyError:'appModelActions')。

这是我的代码:

from django.core.management.base import BaseCommand
from django.db import IntegrityError
from django.contrib.contenttypes.models import ContentType
from django.utils.translation import ugettext_lazy as _
from django.conf import settings
from GeneralApp import models

class Command(BaseCommand):
    help = _("""Run this commando to populate an empty database with initial data required for Attractora to work.
                For the momment, this models are considered on 'populate_db' command:
                    - InventoriManagerApp.InventoryManagerAppActions """)

    def populate_db(self):
        applications = settings.INSTALLED_APPS

        for application in applications:
            try:
                import applications.models
            except:
                pass

        #from InventoryManagerApp.models import InventoryManagerAppActions

        models_to_populate = (vars()['AppModelActions'])
        #models_to_populate = (InventoryManagerAppActions,)

        for model_to_populate in models_to_populate:
            self.populate_model('InventoryManagerApp', model_to_populate)

    def populate_model(self, app_label, model_to_populate):
        model_to_populate_instance = model_to_populate()
        content_type = ContentType.objects.get(app_label=app_label, model=model_to_populate_instance.name)

        if hasattr(model_to_populate_instance, 'populate_data'):
            populate_data = model_to_populate.populate_data
            for record in populate_data:
                for key, value in record.items():
                    setattr(model_to_populate_instance, key, value)
                try:
                    model_to_populate_instance.save()
                except IntegrityError:
                    print("{} already exists.".format(model_to_populate_instance))
                # else:
                #     new_permission = Permission.objects.create(code_name=)

    def handle(self, *args, **kwargs):
        self.populate_db()