source.coffee

extend 'the.models.OurModel', class OurModel extends Backbone.Model
  url: ->
    "#{relativeUrlRoot}/some_controller/some_action#{@get 'channel_type'}_data/#{@get 'end_point_id'}"

  parse: (response) ->
	response.id = "#{response.end_point_id}_#{response.channel_type}"
    	response

spec.coffee

xdescribe "#parse", ->
#how to set this up correctly??
  Given -> @json =
    end_point_id: 44
    channel_type: 'spongebob'
  Given -> @model = new the.models.OurModel
  Given -> spyOn(@model, 'fetch').andReturn(@json)
  When -> @model.fetch()
  Then -> expect(@model.get 'channel_type').toEqual('spongebob')
  Then -> expect(@model.get 'id').toEqual('44_spongebob')