Thanks Russ,
This solves the problem from one end, however in my case the wrong end, as
it would require the app I'm using (and presumably many
other apps relying on the username field) to be re-written; besides which,
USERNAME_FIELD is not present in the User model of django <= 1.4 so every
query for a username would now need a try/except (at least for the first
way you mention)
And the second way doesn't work for get_object_or_404 or other convenience
functions or more complex queries.
Cheers,
On Monday, 24 June 2013 10:36:29 UTC+10, Russell Keith-Magee wrote:
>
>
> On Mon, Jun 24, 2013 at 5:43 AM, Victor Rajewski
> <askv...@gmail.com<javascript:>
> > wrote:
>
>> I have a custom minimal user model subclassing AbstractBaseUser,
>> containing little more than an email address, for use with
>> django-social-auth. However, I'm using an externally-developed app which
>> queries the user model using the username field, which in my case does not
>> exist, resulting in a FieldError. Rather than modifying the external app,
>> it would be nicer to handle this within the User model. While the
>> AbstractBaseUser model does call for specifying which field is the username
>> with the USERNAME_FIELD property, it doesn't actual allow referencing that
>> field as 'username' in a query.
>>
>
> It actually does - you just need to be a little clever about it.
>
> There are two ways -- the hard way (using raw queries), and the easy way.
>
> The hard way:
>
> user = UserModel.objects.get(**{UserModel.USERNAME_FIELD:
> desired_username})
>
> This exploits the fact that you can pass kwargs to any function, and that
> Django's query language is really just a syntax associated with kwarg keys.
> You create a dictionary that describes the query you want, and you unroll
> it in your User queries.
>
> This is a common enough pattern that it's wrapped up in an easier way:
>
> UserModel.objects.get_by_natural_key(desired_username)
>
> This uses the serialisation infrastructure to do exactly the same query
> (you can check the source code if you want :-)
>
> Yours,
> Russ Magee %-)
>
>
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