When creating a new model that requires two foreign keys to refer to the same other model, django requires you to define the related_name attribute for the ForeignKey field.
Thus unless you specify a unique related_name for at least one of your FKs, your models won't validate throwing an error:
Accessor for field 'primary' clashes with related field '<FKModelname>.<modelname_set>'
Ref: http://stackoverflow.com/questions/2642613/what-is-the-related-name-mean-in-django/2642645#2642645
The related_name attribute specifies the name of the reverse relation from the User model back to your model.
If you don't specify a related_name, Django automatically creates one using the name of your model and the suffix _set.
Thus unless you specify a unique related_name for at least one of your FKs, your models won't validate throwing an error:
Accessor for field 'primary' clashes with related field '<FKModelname>.<modelname_set>'
Ref: http://stackoverflow.com/questions/2642613/what-is-the-related-name-mean-in-django/2642645#2642645
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