CODEWITHSUNDEEP
google-app-enginereferenceproperty
ryan
ryan

Reputation: 2331

In Google App Engine, how do I use reference properties between two entities that reference each other?

If I have two types of models that each reference each other, whichever one I try to define first says it does not recognize the referenced other type (because it is defined further down in the file). For example:

class Author(db.Model):
    most_recent_book = db.ReferenceProperty(Book)

class Book(db.Model):
    author = db.ReferenceProperty(Author)

This will claim that the referenced "Book" model is not recognized. If I flip the order, I run into the same issue (except it will say that "Author" is not recognized). How do I get around this?

Upvotes: 9

Views: 1509

Answers (1)

Adam Crossland
Adam Crossland

Reputation: 14213

You can use ReferenceProperty without declaring a type as described in this article from AppEngine Tips

Upvotes: 6

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