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[1.11.x] Fixed #28332 -- Fixed diamond inheritence example in docs.

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Backport of 473ab4610ef90be05f09127aa37cd20bcda5875e from master
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Jeremy Satterfield 2017-08-17 13:06:29 -05:00 committed by Tim Graham
parent 07f73daf6b
commit e921e98387
1 changed files with 6 additions and 1 deletions
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docs/topics/db/models.txt
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@ -1359,15 +1359,20 @@ use an explicit :class:`~django.db.models.AutoField` in the base models::
class BookReview(Book, Article): class BookReview(Book, Article):
pass pass
Or use a common ancestor to hold the :class:`~django.db.models.AutoField`:: Or use a common ancestor to hold the :class:`~django.db.models.AutoField`. This
requires using an explicit :class:`~django.db.models.OneToOneField` from each
parent model to the common ancestor to avoid a clash between the fields that
are automatically generated and inherited by the child::
class Piece(models.Model): class Piece(models.Model):
pass pass
class Article(Piece): class Article(Piece):
article_piece = models.OneToOneField(Piece, on_delete=models.CASCADE, parent_link=True)
... ...
class Book(Piece): class Book(Piece):
book_piece = models.OneToOneField(Piece, on_delete=models.CASCADE, parent_link=True)
... ...
class BookReview(Book, Article): class BookReview(Book, Article):