   last: =>
     return unless cid = _.last(@model_ids)
     @constructor.model.find({ cid: cid })
-
-  unshift: (models...) =>
-    for model in models
-      @model_ids.unshift(model.cid)
-    @model_ids.length
-
-  push: (models...) =>
-    for model in models
-      @model_ids.push(model.cid)
-    @model_ids.length
 
   models: (cids = @model_ids) =>
     models = []


    models

  prependIds: (model_cids...) =>
    @model_ids = model_cids.concat(@model_ids)



    models

  push: (models...) =>
    @appendModels(models)

  appendIds: (model_cids...) =>
    @model_ids = @model_ids.concat(model_cids)

