I also need this exact relationship, but I think it''s impossible due to
the way associations are set up (ie. they relate on a single key). I
haven''t looked closely to be sure, but my instinct is that it has to be
done manually, so I am implementing it without formal associations (ie.
just building the methods I actually need in my model).
M.W. Mitchell wrote:> Hi,
>
> I''ve got a model (Feature) that is "related" to other
Features. The
> name of the has_many is "relations".
>
> There is a join table called FeatureRelation, which holds a feature_id
> and a related_feature_id. Something like:
>
> class Feature
> has_many :relations, :class_name=>''FeatureRelation''
> end
>
> But I don''t want just the relations that a feature has created. I
want
> the relations that other features have created *to* and *from*. Here
> is an example that might show what I mean (doesn''t work):
>
> class Feature
>
> has_many :relations, :class_name=>''FeatureRelation'',
> :conditions=>''feature_id
> = #{id} OR related_feature_id = #{id}''
> end
>
> But this still doesn''t do it. How can I combine the features being
> related to and from together? Like:
>
> Feature.find(1).relations == ''All features relations with
feature_id
> or related_feature_id equal to 1''
>
> Thanks
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