Clever Geek Handbook

Django multiple inheritance E005

The Django docs states that in order to use multiple inheritance, one of them must have

use explicit AutoField in base models

or

use a common ancestor to hold the AutoField

In my case, I have a common ancestor, as in the following setup (taken from the docs):

class Piece(models.Model):
    piece_id = models.AutoField(primary_key=True)

class Article(Piece):
    pass

class Book(Piece):
    pass

class BookReview(Book, Article):
    pass

Unfortunately, this results in the following error:

$ python manage.py check
SystemCheckError: System check identified some issues:

ERRORS:
testapp.BookReview: (models.E005) The field 'piece_ptr' from parent model 'testapp.book' clashes with the field 'piece_ptr' from parent model 'testapp.article'.

System check identified 1 issue (0 silenced).

How to get around this?

EDIT: Django version is 1.8.2

+3


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1 answer


I just found out that I can call a parent reference:

class Piece(models.Model):
    pass

class Article(Piece):
    article_to_piece = models.OneToOneField(Piece, parent_link=True)

class Book(Piece):
    book_to_piece = models.OneToOneField(Piece, parent_link=True)

class BookReview(Book, Article):
    pass


I'm still curious about other solutions!

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