Sample Knockout.js model written in Coffeescript

model.coffee

# Modelo base
class @Model

    constructor: (defaults,urls) ->
        @__defaults = if typeof defaults is "object" then defaults else {}
        @__urls = if typeof urls is "object" then defaults else {}
        @set(@__defaults)

    get: (attr) ->
        ko.unwrapObservable @[attr]

    set: (args) ->
        for own i,item of args
            if ko.isObservable @[i]
                @[i](if item.match(/^&[^\s]*;$/) then item.unescapeHtml() else item)
            else if @[i] isnt undefined
                @[i] = if item.match(/^&[^\s]*;$/) then item.unescapeHtml() else item
    
    clear: ->
        values = {}
        for own i of @
            switch(typeof @get(@[i]))
                when "string" then values[i] = (if @__defaults[i] isnt undefined then @__defaults[i] else "")
                when "number" then values[i] = (if @__defaults[i] isnt undefined then @__defaults[i] else 0)
                when "boolean" then values[i] = (if @__defaults[i] isnt undefined then @__defaults[i] else false)
                when "object"
                    if toString.call() is "[object Array]"
                        values[i] = (if @__defaults[i] isnt undefined then @__defaults[i] else [])
        @set(values)

    toJSON: (options) ->
        temp = @clone(options)
        temp["__no_cache"] = new Date()
        ko.utils.toJSON(temp)
    
    toJS: (options) ->
        temp = @clone(options)
        temp["__no_cache"] = new Date()
        ko.utils.toJS(temp)

    clone: (args) ->
        temp = {}
        args = args or {}
        options = $.extend({"__defaults": false,"__urls": false},args)
        for own i of @
            if options[i] is true or options[i] is undefined
                temp[i] = @get(@[i])
        temp

    isNew: ->
        value = @get("id")
        value? && value isnt ""

    validate: ->
        true

    save: ->
        if @validate() is true
            if @isNew() is true then @create(arguments) else @update(arguments)
        else
            callback({status: "ERROR",message: "Invalid object"})

    __generate_request_parameters: ->
        params = {}
        callback = null
        if typeof arguments[0] is "function"
            callback = arguments[0]
        else if typeof arguments[0] is "object"
            params = arguments[0]
            if typeof arguments[1] is "function"
                callback = arguments[1]
        [params,callback]


    create: ->
        [params,callback] = @__generate_request_parameters(arguments)
        params = $.extend(params,@toJS())
        RQ.add $.post @__url["post"], params, (data) ->
            callback(data) if typeof callback is "function"

    update: ->
        [params,callback] = @__generate_request_parameters(arguments)
        params = $.extend(params,@toJS())
        RQ.add $.post @__url["put"], params, (data) ->
            callback(data) if typeof callback is "function"

    destroy: ->
        [params,callback] = @__generate_request_parameters(arguments)
        params = $.extend(params,{id: @get("id")})
        RQ.add $.post @__url["delete"], params, (data) ->
            callback(data) if typeof callback is "function"

    fetchOne: ->
        __no_cache = new Date()
        [params,callback] = @__generate_request_parameters(arguments)
        params = $.extend(params,{id: @get("id")})
        RQ.add $.get @__url["get"]+"?foo="+__no_cache, {id: @get("id")}, (data) ->
            callback(data) if typeof callback is "function"

    fetchAll: ->
        __no_cache = new Date()
        [params,callback] = @__generate_request_parameters(arguments)
        RQ.add $.get @__url["get"]+"?foo="+__no_cache, params, (data) ->
            callback(data) if typeof callback is "function"