Django 管理模型继承是否可能?

Django admin model Inheritance is it possible?(Django 管理模型继承是否可能?)

问题描述

管理模型中是否可以继承?

Is inheritance possible in admin Models ?

例如考虑以下，

文件:models.py

class AbstractModel ( models.Model ):
    # Meta Information common to all classes
    author = models.ForeignKey(auth.models.User , null = False ,related_name="%(class)s_related_author" ) # The user who created 
    editor = models.ForeignKey(auth.models.User , null = True,related_name="%(class)s_related_editor" ) # The user who last edited                   
    created_at = models.DateTimeField(auto_now_add  = True) # Create Time
    edited_at = models.DateTimeField(auto_now = True) # Modify Time

    class Meta:
                abstract = True


class Topic( AbstractModel ):
    name = models.CharField(max_length = NameMaxLength , unique = True)
    version_number = models.IntegerField(default = 0)
    update_frequency = models.IntegerField()

在 ModelAdmin

文件:admin.py

class Abstract_Admin_Model( admin.ModelAdmin ):
        fields =  ('author' , 'editor' , 'created_at' , 'edited_at')
        readonly_fields = ('author' , 'editor' , 'created_at' , 'edited_at')

        def save_model(self, request, obj, form, change):
                if not change :
                        obj.author = request.user
                else : 
                        obj.editor = request.user
                obj.save()

class Admin_Topic( Abstract_Admin_Model ):
     fields += ('name' , 'version_number' , 'update_frequency')


admin.site.register( Topic , Admin_Topic )

编辑:

我根据建议修改了上面的模型，

I've modified the above model based on suggestions ,

如果 admin.py 是这样的，我没有收到任何错误，并且模型出现在 admin 上.

If the admin.py is like so , I don't get any error , and the model appears on the admin.

class AbstractAdminModel(  admin.ModelAdmin  ):
        pass#fields = ['author' , 'editor' , 'created_at' , 'edited_at']


class Admin_Topic( AbstractAdminModel ):
    pass

admin.site.register( Topic , Admin_Topic )

但是如果我这样修改它

class AbstractAdminModel(  admin.ModelAdmin  ):
    fields = ['author' , 'editor' , 'created_at' , 'edited_at']


class Admin_Topic( AbstractAdminModel ):
    pass

admin.site.register( Topic , Admin_Topic )

我收到以下错误:

这是一个堆栈跟踪 链接

问题:该模型甚至没有出现在管理页面上

Problem : The model does not even appear on the Admin Page

额外信息:

使用 django 1.2.5 和 pinax 0.7.2、Ubuntu 11.04、python 2.7.1+

using django 1.2.5 with pinax 0.7.2 , Ubuntu 11.04 , python 2.7.1+

推荐答案

也许你的答案有点晚了，但我认为其他人可能会遇到类似的问题 - 就像我一样.

Maybe it is bit to late for you for the answer, but I think others can have similar problem - as I did.

这是我的解决方案 - 我不确定它是否合适，但它对我有用，而且上面的其他人也可以这样做(假设你想要一个多表继承(非抽象模型)，就像我一样)

Here is my solution - I am not sure if it is proper, but it works for me and non other from above can do the same (assuming that you want a multitable inheritance (non abstract model), as I do)

class SiteEntityAdmin(admin.ModelAdmin):
    fieldsets = [
            (None, {'fields': ['name']}),
    ]


class PhotoAdmin(SiteEntityAdmin):
    fieldsets = [
             ('Photo details', {'fields': ['photo_url', 'description']}),
    ]
    fieldsets.insert(0, SiteEntityAdmin.fieldsets[0])

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