Rails named_scopes with joins

Question

I\'m trying to create a named_scope that uses a join, but although the generated SQL looks right, the result are garbage. For example:

class Clip < ActiveReco         


        

Answer 1

This is a bug:

http://rails.lighthouseapp.com/projects/8994/tickets/1077-chaining-scopes-with-duplicate- joins-causes-alias-problem

Answer 2

The problem is that "SELECT *" - the query picks up all the columns from clips, series, and shows, in that order. Each table has an id column, and result in conflicts between the named columns in the results. The last id column pulled back (from shows) overrides the one you want. You should be using a :select option with the :joins, like:

named_scope :visible, {
  :select => "episodes.*",
  :joins => "INNER JOIN series ON series.id = clips.owner_id INNER JOIN shows on shows.id = series.show_id", 
  :conditions=>"shows.visible = 1 AND clips.owner_type = 'Series' "
}