Searching a Related model with a scope

Hi, everybody!

I am trying to figure out how to add a related model to an anonymous scope to complete a search. Right now, I have this: if request.post?       scope = Record.scoped({})       scope = scope.conditions "color = ?", params[:color] unless params[:color] == '--Select Color--'       scope = scope.conditions "size = ?", params[:size] unless params[:size] == '--Select Size--'       scope = scope.conditions "shape = ?", params[:shape] unless params[:shape] == '--Select Sample Rate--'       scope = scope.conditions "quantity = ?", params[:quantity] unless params[:quantity] == '--Select Quantity--'       scope = scope.conditions "file_short = ?", params[:length] unless params[:length] == '--Select Length--'       scope = scope.conditions "pair.run.widget = ?", params[:widget] unless params[:widget] == '--Select Name--'       @records = scope end

Records belong to Pairs, and Pairs belong to Runs. Everything will work fine unless a widget is selected, and I need to have it located, at which point it returns a "No such column" from SQL. Is there a work around to allow you to get to a related model?