Re: reverse foreign key relationship usage

Hi Fatih,

This is extremely useful in case you have two different relations
between the same model. As a rough example, consider the two following
models:

class Person(models.Model):
name = models.CharField(max_length=30)

class Car(models.Model):
model = models.CharField(max_length=20)
owner = models.OneToOne(Person, related_name='owned_car')
users = models.ForeignKey(Person, related_name='used_car')

In case of not having a different related_name for each of those two
relations, you wouldn't be able to get the person's car or the car this
person uses. (This person may own a car but use his company car, or a
friend's, a rental one...)





On 03/06/2013 08:30 AM, Fatih Tiryakioglu wrote:
> Hello all,
>
> In Appendix B:Database API, it says "related_name (keyword) is
> particularly useful if a model has two foreign keys to the same second
> model." which is about 'related_name' keyword used reverse foreign key
> relationships.
> e.g. blog = ForeignKey(Blog, related_name='entries').
>
> What does it mean? Where should I use related_name instead of simply
> reversing by "x_set" keyword.
>
> Thanks.
>
>
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--
Kind regards,

Roberto López López


System Developer
Parallab, Uni Computing
Høyteknologisenteret, Thormøhlensgate 55
N-5008 Bergen, Norway
Tel: (+47) 555 84091

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