Re: OneToOne? Inheritance? Another solution for nested model relationships?

2014-05-26 18:33 GMT-03:00 Daniele Procida <daniele@vurt.org>:

I've an application that's been happily running for a few years, that does this:

class Person(Model):
   # everyone's a Person

class Researcher(Model):
    # a Researcher is Person who publishes research
    person = models.OneToOneField(Person)

class Publication(Model):
    author = models.ForeignKey(Researcher)


But this is no longer enough: now I also need to distinguish between Researchers who are research students and members of staff. Those who are students will need new fields such as "thesis_title" and "supervisors".

But, I will *still* need the Researcher class independently of the new ResearchStudent and ResearchStaff classes, because it's needed for Publication.author.

So now it might look something like this:

class Person(Model):
   # everyone's a Person

class Researcher(Model):
    # a Researcher is Person who publishes research
    person = models.OneToOneField(Person)

class ResearchStaff(Model):
   researcher = models.OneToOneField(Researcher)

class ResearchStudent(Model):
   researcher = models.OneToOneField(Researcher)
   supervisors = models.ManyToManyField(ResearchStaff)

So, a ResearchStudent must be a Researcher and can have multiple supervisors, but every supervisor must to be a ResearchStaff and a Researcher too; and everyone is a Person here. Right?

Can a ResearchStudent be a ResearchStaff too?

i'll do something like this:

​

class Publication(Model):
    author = models.ForeignKey(Researcher)


How manageable is this going to be? Is there a better way of doing what I need to do, perhaps through inheritance?

Thanks,

Daniele

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