ifmodel._meta.app_labelinDATABASE_MAPPING: returnDATABASE_MAPPING[model._meta.app_label] returnNone defallow_relation(self, obj1, obj2,**hints): """Allow any relation between apps that use the same database.""" db_obj1=DATABASE_MAPPING.get(obj1._meta.app_label) db_obj2=DATABASE_M...
return DATABASE_MAPPING[model._meta.app_label] return None def allow_relation(self, obj1, obj2, **hints): """Allow any relation between apps that use the same database.""" db_obj1 = DATABASE_MAPPING.get(obj1._meta.app_label) db_obj2 = DATABASE_MAPPING.get(obj2._meta.app_label...
#tests.pyfromdjango.testimportTestCasefrommyapp.modelsimportMyModel#导入你的模型fromother_app.modelsimportOtherModel#导入另一个应用程序的模型classMyTest(TestCase):deftest_import_data(self):#在 SQL Server 数据库中查询数据other_data = OtherModel.objects.using('sql_server').all()#使用名为 'sql_s...
Manager): def get_queryset(self): qs = super().get_queryset() # if `use_db` is set on model use that for choosing the DB if hasattr(self.model, 'use_db'): qs = qs.using(self.model.use_db) return qs Just add use_db='databasename' and this manager to your model and it...
The tables for my_app are created in the remote database, and in django_migrations inside the remote database the migrations are marked as applied. EDIT: How to force Django to use only one table django_migrations, but still apply the migrations into different databases? How to...
For a model which has a many-to-many relationship to itself through an intermediary model, two foreign keys to the same model are permitted, but they will be treated as the two (different) sides of the many-to-many relationship. If there are more than two foreign keys though, you must...
For a model which has a many-to-many relationship to itself through an intermediary model, two foreign keys to the same model are permitted, but they will be treated as the two (different) sides of the many-to-many relationship. If there are more than two foreign keys though, you must...
创建app,生成迁移文件,执行迁移之后在django_content_type表会新增该app下的模型model记录,在auth_permission表中对每一个model就会新增4条CRUD记录。 django_content_type表 auth_permission表 自定义数据库表名和字段名 Django中生成的数据库表名默认为{appname}_类名,如果想生成的表名直接是数据库类名的话需要做...
https://stackoverflow.com/questions/35388637/runtimeerror-model-class-django-contrib-sites-models-site-doesnt-declare-an-ex 原因: Django's Sites Frameworkis a contributed module bundled with the core library that allows for the use of a singleDjangoapplication/codebase with different sites (that ...
更好的方法是使用django自带的model_to_dict(instance, fields=None, exclude=None)方法,其中,fields指定需要哪些字段,exclude指定排除哪些字段,exclude比fields优先更级高。 fromdjango.forms.models import model_to_dictmodel_to_dict(Blog.objects.first(),exclude=['create_time','update_time']) ...