On Thursday, September 28, 2017 at 2:16:44 PM UTC+1, Derek wrote:
>
> Note that
>
> user.is_authenticated()
>
> has become
>
> user.is_authenticated
>
> in Django 1.10
>
Still on 1.8 in this case
>
> Otherwise if user is really (or could really) be None, then try... except
> may be better:
>
Thanks, will try it. I still do not understand why checking for not None
does not work as I expected.
Importing the code into the Django shell and calling authenticate() with an
invalid username/password combination works as expected
if user.is_authenticated() and user.is_staff:
> do something
> else:
> do something else
> except AttributeError as err:
> log.error('User not found:%s' % err)
>
>
> On Thursday, 28 September 2017 13:50:27 UTC+2, graeme wrote:
>>
>> In a custom authentication backend, I was getting this error with this
>> (previous developer's!) code:
>>
>> if user.is_authenticated() and user.is_staff:
>> AttributeError: 'NoneType' object has no attribute 'is_authenticated'
>>
>>
>> The cause seemed clear, the parent classes method was run first with super
>> and returned None when it failed to authenticate, so I tried to fix by
>> testing whether user is None, but I still get this:
>>
>>
>> if (user is not None) and user.is_authenticated() and user.is_staff:
>> AttributeError: 'NoneType' object has no attribute 'is_authenticated'
>>
>>
>> I am probably missing something obvious, but if user is None, only (user is
>> not None) will be evaluated there should be no error, if user is not None, I
>> should not have a NoneType in the error.
>>
>>
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