这不是一个元组吗? [英] Is this not a tuple?
问题描述
不是CategoryAdmin.fields一个元组?我读这个错了吗?
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
)
p>不,不是。您需要添加一个逗号:
fields =('title',)
这是一个元组的逗号。圆括号在这里真的是可选的:
>>> ('title')
'title'
>>> 'title',
('title')
圆括号当然还是好的主意,括号元组更容易在视觉上看到,括号中的函数调用中的元组与其他参数( foo(('title',),'bar')区分开)
不同于 foo('title','bar')
)。
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.
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
)
No, it is not. You need to add a comma:
fields = ('title',)
It is the comma that makes this a tuple. The parenthesis are really just optional here:
>>> ('title')
'title'
>>> 'title',
('title',)
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')
).
这篇关于这不是一个元组吗?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!