Re: reverse foreign key relationship usage
Thank you Robert, I got it. -- 6 Mart 2013 Çarşamba 12:06:06 UTC+2 tarihinde Roberto López López yazdı: > > > 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. > > > > > > -- > > > > -- > > You received this message because you are subscribed to the Google > > Groups "Django users" group. > > To unsubscribe from this group and stop receiving emails from it, send > > an email to django-users...@googlegroups.com . > > To post to this group, send email to > > django...@googlegroups.com. > > > Visit this group at http://groups.google.com/group/django-users?hl=en. > > For more options, visit https://groups.google.com/groups/opt_out. > > > > > > > -- > Kind regards, > > Roberto L�pez L�pez > > > System Developer > Parallab, Uni Computing > H�yteknologisenteret, Thorm�hlensgate 55 > N-5008 Bergen, Norway > Tel:(+47) 555 84091 > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
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. > > > -- > > -- > You received this message because you are subscribed to the Google > Groups "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to django-users+unsubscr...@googlegroups.com. > To post to this group, send email to django-users@googlegroups.com. > Visit this group at http://groups.google.com/group/django-users?hl=en. > For more options, visit https://groups.google.com/groups/opt_out. > > -- Kind regards, Roberto López López System Developer Parallab, Uni Computing Høyteknologisenteret, Thormøhlensgate 55 N-5008 Bergen, Norway Tel:(+47) 555 84091 -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
reverse foreign key relationship usage
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. -- -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
