Django将字段添加到现有模型应用程序

Question

in my new Django app I use 3rd-part Photologue app. This app works well, but I need to add some field in its model without change the original source code of Photologue app.

With this snippet, all works well, but maybe this is not the best solution:

Photo.add_to_class("link", models.URLField(max_leng.... ))

I've read some posts where I should use OneToOneRelationField ... but then, in django admin app, I will have two different form page of Photo and new PhotoLink class...

Does anyone can help me?

Answer 1

If you are using a OneToOneField , you can use your 'extension' model as an inline to the model you are extending. You do this by first un-registering the original admin class, and then overriding it with our variant:

from otherapp.admin import OriginalFooAdmin
from otherapp.models import Foo
from yourapp.models import YourExtension
from django.contrib import admin

admin.site.unregister(Foo)

class ExtensionInline(admin.StackedInline):
    model = YourExtension

class NewFooAdmin(OriginalFooAdmin):
    inlines = OriginalFooAdmin.inlines + [ExtensionInline]
admin.site.register(Foo, NewFooAdmin)