I have a model object that looks something like this:
class Foo(models.Model)
foo_id = models.IntegerField(primary_key = True)
xyz = models.CharField(max_length = 20)
In my application, I'd like to add a list of Bar objects. It's like a
foreign key, except that Bar objects don't exist in my databases. So
I want a Foo.bars field.
- If I just create the field:
class Foo(models.Model)
foo_id = models.IntegerField(primary_key = True)
xyz = models.CharField(max_length = 20)
bars = []
Then the list belongs to the class, not instances.
- If I try creating the field lazily, e.g.
class Foo(models.Model)
foo_id = models.IntegerField(primary_key = True)
xyz = models.CharField(max_length = 20)
def attach_bar(self, bar):
if self.bars is None:
self.bars = []
self.bars.append(bar)
Then calling attach_bar from the application results in an
AttributeError, 'Foo' object has no attribute 'bars'.
- Specifying Foo.__init__ to initialize bars doesn't work, because it
interferes with creation of Foo objects from database queries.
I played around with subclassing, e.g. class FooBase
(models.Model) ... class Foo(FooBase) but couldn't get that to work.
How can I add a field to the Foo class that doesn't come from the
database?
Jack Orenstein
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