rails named_scopes joins

i'm perplexing emanate named_scope uses join, nonetheless nonetheless generated sql looks right, outcome garbage. example:

class trim < activerecord::base      
  named_scope :visible, {
    :joins => "inner join array series.id = clips.owner_id middle join shows shows.id = series.show_id", 
    :conditions=>"shows.visible = 1 clips.owner_type = 'series' "
  }

(a trim owned series, array belongs show, arrangement manifest invisible).

clip.all does:

select * `clips` 

clip.visible.all does:

select * `clips` middle join array series.id = clips.owner_id middle join shows shows.id = series.show_id where (shows.visible = 1 clips.owner_type = 'series' ) 

this looks okay. nonetheless indirect array trim models includes trim an id that's database - it's picked adult arrangement id instead. where am i going wrong?