     if not @collectionId = opts.collectionId
       throw new Error "SharedCollection needs a collectionId in options!"
 
-    @_syncAttributes = {}
     super
 
   handleError: (model) => (err) =>


    log "RECEIVE ADD #{ op.oi.id }: #{ JSON.stringify op.oi }"

    @_syncAdded = op.oi.id
    @create op.oi


  _receiveModelDestroy: (op) ->


  _sendModelDestroy: (model) ->

    log "SEND REMOVE #{ model.id }"

    @_syncDoc.submitOp [
      p: [@collectionId , model.id]
      od: true
