This might help 
maybe: 
https://docs.djangoproject.com/en/1.8/ref/models/fields/#django.db.models.ForeignKey.allow_unsaved_instance_assignment

On Thursday, 16 July 2015 12:21:30 UTC+1, Roland Swingler wrote:
>
> Hi all,
>
> I've very recently come to to Django from a rails background, and 
> struggling to do unit testing of Django models without saving to the 
> database as I'm used to in Rails. Lets say you have 2 linked models, for 
> example User and UserProfileDetails, then in my tests I want to set up the 
> structure and not save any of it:
>
>     user = User()
>     user.profile_details = UserProfileDetails()
>     ...
>     # stuff that tests non-persistence related functionality
>
> But I don't seem to be able to do this, because it will raise a 
> RelatedObjectDoesNotExist error, saying UserProfileDetails has no user. 
> Obviously I can get around this by saving the user first, but if I want to 
> not touch the database in tests is there any way I can achieve this?
>
> (also apologies if this has been asked before - I did a quick search of 
> the archives and couldn't find anything).
>
> Thanks in advance,
> Roland
>

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