Add a Meta.serialize option to models

[Johannes Dollinger]

For unmanaged models it would be nice if dumpdata knew that a particular model should never be serialized.

class MyModel(models.Model):
    class Meta:
        managed = False
        serialize = False

I picked the name serialize for symmetry with Field.serialize, although I'd generally prefer serializable.

[Johannes Dollinger]

with docs

[Russell Keith-Magee]

I don't like putting attributes like this on Meta - it limits the ability to reuse a model, and acts as a hard constraint on end-user actions. As soon as someone defines an option on the model that says "Don't ever ever", someone will find an edge case where it is needed.

--exclude is already available on dumpdata to exclude specific models from being serialized. IMHO, that's the right approach here.