Filter on property.key?
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Aaron Krill
Apr 15, 2008, 5:47:42 PM4/15/08
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I have a ReferenceProperty and I'd like to be able to filter on it. Is this possible?
ryan
Apr 15, 2008, 9:02:45 PM4/15/08
to Google App Engine
Yes, filtering on reference properties in queries works just like
filtering on other property types. You just need to use a Key as the
filter value.
filtering on other property types. You just need to use a Key as the
filter value.
Diz
May 17, 2008, 1:09:09 PM5/17/08
to Google App Engine
Hello,
could you please provide brief example of code with filter on
ReferenceProperty?
Thank you in advance.
could you please provide brief example of code with filter on
ReferenceProperty?
Thank you in advance.
ryan
May 18, 2008, 1:17:21 PM5/18/08
to Google App Engine
sure! i haven't tested this, but here goes:
class Foo(db.Model):
pass
class Bar(db.Model):
foo = db.ReferenceProperty(Foo)
key = Foo().put()
query = Bar.gql('WHERE foo = :1', key)
class Foo(db.Model):
pass
class Bar(db.Model):
foo = db.ReferenceProperty(Foo)
key = Foo().put()
query = Bar.gql('WHERE foo = :1', key)
Mahmoud
May 19, 2008, 9:34:09 AM5/19/08
to Google App Engine
You do not have to explicitly use a key, you can just pass an instance
of Foo, and the AppEngine will implicitly use the key under the hood.
You can also use:
foo = Foo()
foo.put()
query = Bar,gql('WHERE foo = :1', foo)
of Foo, and the AppEngine will implicitly use the key under the hood.
You can also use:
foo = Foo()
foo.put()
query = Bar,gql('WHERE foo = :1', foo)
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