Struggling with One to One relationships

Hi

I have a super class Job that will never be instantiated on it's own,
although is not Meta.

There are two other models, WorkshopJob and EngineeringJob, which have
o2o links to a Job.

On creation of either WorkshopJob and EngineeringJob, a new Job is made.

The problem arises because any particular job may have both other
types linked to it - some Jobs will only be linked to either/or, but
some will have both.

Regardless of that, there will only ever be one WorkshopJob and or one
EngineeringJob per job.

I am struggling to create the second object - when I try to create a
new WorkshopJob from an existing EngineeringJob (ie, linking the
underlying Job id number to the as yet unsaved new Workshop job),
creation fails.

Is it because I have parent_link=True on both subclasses? Is it
because the o2o will only allow a single FK on an object? Or is it
possible - I've just made a mistake somewhere else (I tried CBVs, I
tried FBVs, nada).

Cheers
L.

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