92 lines
3.2 KiB
CoffeeScript
92 lines
3.2 KiB
CoffeeScript
###
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Crafting Guide - base_model.coffee
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Copyright (c) 2014-2015 by Redwood Labs
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All rights reserved.
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###
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{Event} = require '../constants'
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{ModelState} = require '../constants'
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########################################################################################################################
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module.exports = class BaseModel extends Backbone.Model
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constructor: (attributes={}, options={})->
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options.logEvents ?= true
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super attributes, options
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makeGetter = (name)-> return -> @get name
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makeSetter = (name)-> return (value)-> @set name, value
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for name, value of attributes
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continue if name is 'id'
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Object.defineProperty this, name, get:makeGetter(name), set:makeSetter(name)
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@logEvents = options.logEvents or false
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@state = ModelState.unloaded
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@loading = null
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Object.defineProperties this,
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isUnloaded: { get:-> @state is ModelState.unloaded }
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isLoading: { get:-> @state is ModelState.loading }
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isLoaded: { get:-> @state is ModelState.loaded }
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isError: { get:-> @state is ModelState.error }
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# Event Methods ################################################################################
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onLoadSucceeded: (text, status, xhr)->
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try
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@set @parse text
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@state = ModelState.loaded
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@trigger Event.change, this
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@trigger Event.sync, this
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logger.info => "#{@constructor.name}.#{@cid} loaded successfully"
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catch e
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logger.error -> "A parsing error occured: #{e.stack}"
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@onLoadFailed e.message, 'parsing failed', xhr
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onLoadFailed: (error, status, xhr)->
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@state = ModelState.error
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logger.error => "#{@constructor.name}.#{@cid} failed to load: status:#{status}, message:#{error}"
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@trigger Event.error, this, error
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# Backbone.Model Overrides #####################################################################
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fetch: (options={})->
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options.force ?= false
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return if (@isLoading or @isLoaded) and not options.force
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url = @url()
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logger.info => "#{@constructor.name}.#{@cid} reading from url: #{url}"
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@state = ModelState.loading
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@trigger Event.request, this
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@loading = w.promise (resolve, reject)=>
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$.ajax
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url: url
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dataType: 'text'
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success: (text, status, xhr)=> resolve @onLoadSucceeded text, status, xhr
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error: (xhr, status, error)=> reject @onLoadFailed error, status, xhr
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@loading.catch -> # do nothing. prevents unhandled promise warnings
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return @loading
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parse: (text)->
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return JSON.parse text
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sync: (method, model)->
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throw new Error "#{@constructor.name}.#{@cid} is not permitted to #{method}"
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trigger: (name, model, args...)->
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if @logEvents
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argText = ("#{arg}"[0..50] for arg in args).join ", "
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logger.trace => "#{@constructor.name}.#{@cid} triggered event #{name} with args: #{argText}"
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super
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# Object Overrides #############################################################################
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toString: ->
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return "#{@constructor.name}.#{@cid}"
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