这不是元组吗? [英] Is this not a tuple?

问题描述

我无法弄清楚我在这里做错了什么.我的错误是:/admin/'CategoryAdmin.fields' 的配置不当必须是列表或元组.

I can't figure out what I'm doing wrong here. My error is: ImproperlyConfigured at /admin/ 'CategoryAdmin.fields' must be a list or tuple.

CategoryAdmin.fields 不是元组吗?我读错了吗?

Isn't the CategoryAdmin.fields a tuple? Am I reading this wrong?

admin.py..

class CategoryAdmin(admin.ModelAdmin):
    fields = ('title')
    list_display = ('id', 'title', 'creation_date')

class PostAdmin(admin.ModelAdmin):
    fields = ('author', 'title', 'content')
    list_display = ('id', 'title', 'creation_date')

admin.site.register(
    models.Category, 
    CategoryAdmin
)
admin.site.register(
    models.Post, 
    PostAdmin
)

推荐答案

不，不是.您需要添加一个逗号:

No, it is not. You need to add a comma:

fields = ('title',)

正是 逗号 使它成为一个元组.括号在这里实际上只是可选的:

It is the comma that makes this a tuple. The parenthesis are really just optional here:

>>> ('title')
'title'
>>> 'title',
('title',)

括号当然仍然是个好主意，带括号的元组更容易在视觉上发现，并且括号将函数调用中的元组与其他参数(foo(('title',), 'bar') 与 foo('title', 'bar')) 不同.

The parenthesis are of course still a good idea, with parenthesis tuples are easier to spot visually, and the parenthesis distinguish the tuple in a function call from other parameters (foo(('title',), 'bar') is different from foo('title', 'bar')).

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