Saving related model objects

Answer 1

I would guess that one of your models has a Foreign Key field which is not nullable. When you do objBlog.entry_set.add(objEntry1) django calls save() on each object.

This is how the add method looks like:

def add(self, *objs):
    for obj in objs:
        if not isinstance(obj, self.model):
            raise TypeError("'%s' instance expected" % self.model._meta.object_name)
        setattr(obj, rel_field.name, instance)
        obj.save()
add.alters_data = True