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Given this Backbone Collection define [ 'underscore', 'backbone', 'cs!models/floor' ], ( _, Backbone, Floor ) -> return Backbone.Collection.extend model: Floor url: -> return '/api/hotels/' + @hotelId + '/floors' initialize: (models, options) -> if ( options.hotelId ) @hotelId = options.hotelId @.fetch() parse: (response) -> response.floors alreadyExist: -> @.filter( (floor) -> return floor.get('number') == @.attrs.get('number') ) and adding a new Model from a view the way below, how can I validate if the model already exist within the collection ? add_floor: (e) -> console.log ' Saving Floor ' e.preventDefault() floorNumber = $('input[name=floorNumber]').val() floorDescription = $('input[name=floorDescription]').val() return new NoticeView({ message: "Please enter a Floor Number.", displayLength: 10000 }) unless floorNumber if ! @collection.add({ number: floorNumber}).alreadyExist() @collection.create({ number: floorNumber, description: floorDescription }, { error: (model, response) -> # $(e.target).removeClass('waiting'); new ErrorView({ message: "Problem saving Floor " + response.responseText, displayLength: 10000 }) success : (model, response) -> console.log model console.log response new NoticeView({ message: "Floor successfully saved.", displayLength: 10000 }) }) else new ErrorView({ message: "Floor already exist." + response.responseText, displayLength: 10000 })

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