On Aug 27, 2010, at 8:54 PM, uramagget wrote:
> Hello Elixir,
>
> Fairly new to this Elixir + SA abstraction, and the ease of
> establishing relationships between entities sold me. I've attempted
> giving this a shot by trying to implement it on a forum system I've
> been working on, with the following code:
>
> http://paste.pocoo.org/show/x0kg5V5686py3oYjUadw/
>
> The Topic entity initializes fine without the `lastpost` relationship,
> although when attempting to initialize it with the relation specified,
> an exception is raised. Is there something that I am doing wrong that
> I need to rectify? I'm not exactly sure what specifying an `inverse`
> argument would do, as I believe I tried passing inverse='Topic' for
> the `lastpost` relation.
>
> Exception: Several relations match as inverse of the 'topic' relation
> in entity 'Post'. You should specify inverse relations manually by
> using the inverse key
You define the relation wrong - you want a
lastpost_id
column on Topic, which means that you need to declare it as
lastpost = ManyToOne("Post")
on Topic. Remember, from the view of Post, one post *could* be set on a great
many Topics as lastpost - that's not your intended semantic, but it's perfectly
possible from a DB-point of view.
And if Elixir still complains, you need to define inverse="<name of the
relation>", *NOT* with the name "Topic" or "Post" - these are the classes, not
the relations!!!
Diez
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