Question

I have a profile.

class UserProfile(models.Model):
    user = models.ForeignKey(User, related_name="%(class)s", unique=True)
    providers = models.ManyToManyField(ServiceProvider, related_name="%(class)s")

class ServiceProvider(models.Model):
    name = models.CharField(max_length=200, null=False, default="ims")  

How do I get to the user object with just having the profile object.
Can I do: (assuming I have my service provider object)

provider.userprofile.user.get() // or something like that.

I’d like to do that in one sql query. So if I had just the pk of the provider, it would be great to get to the user profile and/or the user that holds that provider.

Answer 1

Since your User is just a foreign key, all you need is provider.userprofile.user

If you don’t want that to incur a second SQL query, you can just use the select_related option when selecting your profile, like:

UserProfile.objects.get(pk=<the_id>,select_related=True)

As written, your models don’t provide a trivial way to get from the provider to the User, since there is a ManyToMany from the ServiceProvider to the UserProfile. You’ll have to get the set of UserProfiles associated with the provider, get the one you want, and then proceed to get the User as above.