On 24 Nov 2008, at 18:07, Sven Aas wrote:
> On Mon, Nov 24, 2008 at 12:49 PM, Frederick Cheung <[EMAIL PROTECTED]
> > wrote:
> It should do that by itself. You shouldn't need to do anything. Have
> you tried it?
>
> Fred
>
> Yes, with code like this:
>
> named_scope :featured, :joins => :category_assignments,
> :conditions =>
> ['category_assignments.featured = ?', true ]
>
> When I call
>
> Post.featured
>
> it works fine. But when I call, category.posts.featured I get
>
> ActiveRecord::StatementInvalid: SQLite3::SQLException: ambiguous
> column name: category_assignments.post_id
>
> because Rails generates this query:
>
> SELECT "posts".* FROM "posts"
> INNER JOIN "category_assignments" ON category_assignments.post_id
> = post.id
> INNER JOIN category_assignments ON posts.id =
> category_assignments.post_id
> WHERE (("category_assignments".category_id = 1))
> AND ((category_assignments.featured = 't'))
>
> As you can see, category_assignments is being joined twice. The
> named_scope needs to omit the category_assignments join when it gets
> called on a Category instance.
>
Oops. I skimmed over the definition of your scope and didn't notice
that there was a join. I'm going out on a limb here but from inside a
procedural named scope then if there is a @proxy_owner instance
variable or if it responds to proxy_owner/proxy_target then it;s an
association. You could also check the current scope and see what
joins are in there.
Fred
> I'm running this on Rails 2.1.1, by the way.
>
> -Sven
>
> PS: there was an error in my initial post. I specified
> :conditions => {:category_assignments.featured => true }
> where I ought to have written
> :conditions => ['category_assignments.featured = ?', true]
>
> >
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