Hi Guevara, Proxy models only inherit python logic, they are what you expect when you subclass a superclass; I dont think thats what you want in this case.
I think you actually do want multi-table inheritence, im not too well educated in "design patterns" but i think thats what you mean by composition. However, allthough Python itselfs supports multiple-inheretence, im not sure if that works with more then two Django models. Subclassing a Django model implies a OneToOne relationship which is automaticly generated. An instance of employee should then contain fields from both Person and Adress on the python layer, and contain only the foreign keys on the database layer. Again i'm not sure if this works with 3 models involved (Address, Person and Employee). Take a look at http://docs.djangoproject.com/en/1.3/topics/db/models/#multi-table-inheritance This is what i mean: class Person(models.Model): first_name ... last_name ... class Adress(models.Model): street ... city ... class Employee(Person, Adress): pass Regards, Yuka On Sat, Apr 16, 2011 at 10:35 PM, Guevara <eguevara2...@gmail.com> wrote: > Hello! > I have two class, Person and employee, i need make a composition for > this (Prefer composition over inheritance): > > class Person(models.Model): > name = models.CharField(max_length=50) > date_inclusion = models.DateField() > # others fields > > class Employee(models.Model): > person = models.OneToOneField(Person, primary_key=True) > address = models.OneToOneField(Address, primary_key=True) > > > The SQL generate is: > > > BEGIN; > CREATE TABLE "person_person" ( > "id" serial NOT NULL PRIMARY KEY, > "name" varchar(50) NOT NULL, > "date_inclusion" date NOT NULL, > ) > ; > CREATE TABLE "employee_employee" ( > "person_id" integer NOT NULL PRIMARY KEY, > "address_id" integer NOT NULL PRIMARY KEY, > ) > ; > > > This is correct? Should generate the id of the employee? > Proxy models could be used for this case? > > Thanks! > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To post to this group, send email to django-users@googlegroups.com. > To unsubscribe from this group, send email to > django-users+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/django-users?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
