Re: Model design question

On 18/05/2012 7:02am, oneroler wrote:
> I'm trying to setup my first app and I'm trying to figure out the best
> way to have constraints on a particular field (strategy for class
> Division noted below). Below is the basic model structure. What I
> would like is for the strategy under a Division to be constrained to
> the strategies selected for the Business. A business may have many
> strategies, but a division will only have one (but it should only be
> one selected for the business). Any help on this would be
> appreciated. Thanks, Sam
>
> class Strategy(models.Model):
> name = models.CharField(max_length=200)
>
> #name would be something like retail, wholesale, etc
>
> class Business(models.Model):
> name = models.CharField()
> strategy = models.ManyToManyField(Strategy)
>
> class Division(models.Model):
> business = models.ForeignKey(Business)
> name = models.CharField()
> strategy = ???

Try ...

strategy = models.ForeignKey(Strategy)


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