Re: saving data from both a model and a derived model

James,

I'm thinking about my last question more. If each object of the given type must be unique, there must be a manager in Django which keeps track of uniqueness. I will start searching for how I check for unique objects, but if you have a quick response, that will help.

Jim

On Tuesday, May 23, 2017 at 6:44:01 PM UTC-4, jjander...@gmail.com wrote:

I have a model class, 'A_base', and a 2nd model class, 'A_derived'. When I save an object of A_derived, I want the data from both my base and derived class to be saved.

Example code looks like this:

    class A_base(models.model):
        name = models.CharField(max_length=50)

    class A_derived(A_base):
        role = models.CharField(max_length=50)


So when I call save(), I want to save an instance of the derived object, including the data in the base class into my sqlite3 database. I would like my code to look like this:

    ...
    derived_obj = A_derived.objects.get(name="john")
    derived_obj.role = "parent"
    derived_obj.save()
    ...

My question is whether the save method will save 'role' to the A_derived table and save 'name' to the A_base table? Or do I have to override the save method so that it saves 'role' and then calls the base class save method to save 'name'?

I tried doing this using the default save method and it created a stack trace, so I'm guessing that I am expecting too much from the default save method.

Jim A.

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