diff options
| -rw-r--r-- | doc/build/content/datamapping.myt | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/doc/build/content/datamapping.myt b/doc/build/content/datamapping.myt index febf9bf8b..10dd6e475 100644 --- a/doc/build/content/datamapping.myt +++ b/doc/build/content/datamapping.myt @@ -343,16 +343,16 @@ DELETE FROM addresses WHERE addresses.address_id = :address_id True </&> -+<p>The backreference feature also works with many-to-many relationships, which are described later. When creating a backreference, a corresponding property is placed on the child mapper. The default arguments to this property can be overridden using the <span class="codeline">backref()</span> function: +<p>The backreference feature also works with many-to-many relationships, which are described later. When creating a backreference, a corresponding property is placed on the child mapper. The default arguments to this property can be overridden using the <span class="codeline">backref()</span> function: <&|formatting.myt:code&> Address.mapper = mapper(Address, addresses) User.mapper = mapper(User, users, properties = { - 'addresses' : relation(Address.mapper, backref=backref('user', lazy=False, private=True)) + 'addresses' : relation(Address.mapper, + backref=backref('user', lazy=False, private=True)) } ) </&> -<p>Note that when overriding a backreferenced property, we re-specify the backreference as well. This will not override the existing 'addresses' property on the User class, but just sends a message to the attribute-management system that it should continue to maintain this backreference.</p> </&> <&|doclib.myt:item, name="cascade", description="Creating Relationships Automatically with cascade_mappers" &> <p>The mapper package has a helper function <span class="codeline">cascade_mappers()</span> which can simplify the task of linking several mappers together. Given a list of classes and/or mappers, it identifies the foreign key relationships between the given mappers or corresponding class mappers, and creates relation() objects representing those relationships, including a backreference. Attempts to find |