AttributeError when trying to reference ForeignKey attributes

[Robbie Edwards]

Hi, I have some code like such...

def gen_planet_pos( max_dim ):

    return random.randint( 0, max_dim )

class Universe( models.Model ):

    width = models.IntegerField( default=100 )

    ...

class Planet( models.Model ):

    universe = models.ForeignKey( Universe )

    ...

    x_pos = models.IntegerField( default=gen_planet_pos( universe.width ) )

When I try to use this, I get "AttributeError: 'ForeignKey' object has no attribute 'width'".  That message appears when I try to even enter the shell.  I'm not sure what to do to prevent this error.  Your help is appreciated.

robbie 

[Kelvin Wong]

Might try removing the default from x_pos then try setting it by overriding the save method

https://docs.djangoproject.com/en/1.4/topics/db/models/#overriding-predefined-model-methods

K

[Robbie Edwards]

That should work.  Thanks for the suggestion.

robbie