List of gotchas for dealing with "bugs" in Parse's javascript SDK

Parse-Gotchas.coffee

## Fetch related when fetching

    fetch: (options) ->
      console.log("Fetching order")

      # Does not work when order is created by rotateOrder, and does not have an .id specified.
      (OrderModel.__super__.fetch.apply(this, [])).then => 
        @fetch_related().then ->
          options.success() if options.success?


## Fetch related, useing deffered and returning promises

fetch_related: ->
  fetch_rest = $.Deferred (defer) =>
    @get_restaurant().fetch deferredHandlers(defer)

  fetch_addr = $.Deferred (defer) =>
    @get_delivery_address().fetch deferredHandlers(defer)

  fetch_cc = $.Deferred (defer) =>
    @get_billing_cc().fetch deferredHandlers(defer)

  $.when fetch_rest, fetch_addr, fetch_cc


## Constructor of getter for related model that return an instance 
## of domain-specific classes, instead of native Parse object

    buildRelatedGetter = (relation, class_name) ->
      ->
        if @get(relation)? and !(@get(relation) instanceof App.Models[class_name])
          # Convert related to class
          attrs    = @get(relation).attributes
          attrs.objectId = @get(relation).id
          @set relation, new App.Models[class_name](attrs)

        @get relation

## Extending Parse.User requires a workaround: 

    _.extend Parse.User.prototype, 
      defaults: {...}
      getter: ->
        # ...
      setter: (val) -> 
        # ...

## Persisted anonymous Parse users:

    getUserForAppState = -> 
      # Fetch related compenents to get started with user. 

      current_user = Parse.User.current()
      
      # First time in app? Create new random user. 
      if !current_user?
        current_user = new Parse.User
          username: randomString 40
          password: randomString 40

        # Save the new random user.
        # TODO: Figure out some way to handle errors when creating these anonymous users.
        current_user.signUp
          error: ->
            console.error "FAILURE FETCHING USER", arguments

      current_user


## Get a single config variable hosted on Parse

    window.getConfig = (config_name, cb) ->
      configError = (object, error) ->
        console.error("COULDN'T RETRIEVE CONFIG VAR: "+config_name, error)
        cb error.code

      query = new Parse.Query(pizzabuttonapp.Models.ConfigModel)
      query.equalTo 'name', config_name
      query.find 
        success: (result) ->
          config = result[0]

          if config?
            cb null, config.get('value')
          else
            cb 
              code: "Config with that name not found."

        error: configError