has many condition

qcall_contact_list.rb

has_many :tz_qcall_lists, :conditions => ["qcall_contacts_count > 0"], :dependent => :destroy

#qcalls_controller.rb

format.fxml  { render :fxml => @qcall.to_fxml(
        :only =>     [
          :id,:name,:desc,:user_group_id,
          :callerid_name,:callerid_phone,:msgset_abandon,
          :duration_abandon,:total_calls,:abandon_calls,
          :stats_call,:vmd,:poverride,:max_retry,
          :start_calltime,:end_calltime,:wait_for,:ring_for
        ],
        :include => {:qcall_contact_lists => {:only => [:id, :name], :include => {
          :tz_qcall_lists => { 
            ## :conditions => ['qcall_contacts_count > 0 '], => esto no anda
            :only => [:qcall_contact_list_id, :id, :timezone, :active, :weight],
            :methods => [:total_contacts, :connected_contacts, :left_to_call, :ratio, :calls_made]
          }
         }}},
        :except => [:created_at,:updated_at],
        :methods=>  [
          :total_contacts,:connected_contacts,
          :calls_made,:stats_q,:stats_lead,
          :stats_scheduled,:stats_dead,
          :stats_graveyard,:stats_call,
          :contacts_maxed,:contacts_tried,
          :contacts_timeout,:stats_all
        ]
      )}

tambien probe tener:
has_many :tz_qcall_lists, :dependent => :destroy
has_many :tz_qcall_lists_with_contacts, :conditions => ['qcall_contacts_count > 0']

Esto me funciono, pero hay que toquetear mucho en flex

Algo así? https://gist.github.com/be0d3f32b6002a2fdf1d