filtered-collection.coffee

class FilterCollection extends Backbone.Collection
  set: (models, options) ->
    models = if _.isArray models
      models
    else
      [models]
      
    [models, filtered]= _.partition models, @filter
    super(models,   _.extend({merge: false}, options, {add: true, remove: false              }))
    super(filtered, _.extend({merge: false}, options, {add: true, remove: false, silent: true}))

  each: (args...) ->
    models = if _.isFunction @filter
       _.filter @models, @filter
    else
      @models
    args.unshift models
    _.each.apply _, args
  
  filter: -> true
    
  setFilter: (filter) ->
    @filter = filter
    @trigger "reset"