Can anyone using backbone.js lend a hand?
How can error messages from a rails app be encoded when integrating with backbone.js? For instance, how should flash messages like "record not found" be handled?
While errors are usually defined on the client side, there may be cases where server-side errors need to be passed. This results in unexpected data from the server, different from the usual list of records received by a collection.
By setting your rails controller as:
respond_to :json
You can easily receive errors in JSON format (just make sure to use respond_with(object))
class XYZController < ApplicationController
respond_to :html, :json
responders :jsons
def create
@xyz = Xyz.new( params[:xyz] )
@xyz.save
respond_with @xyz, :location=>@xyz.id.nil? ? "" : edit_xyz_url(@xyz)
end
A custom JSON responder was implemented specifically for handling Backbone interactions:
module Responders
module JsonResponder
def to_json
raise error unless resourceful?
if get?
display resource
elsif has_errors?
display resource.errors, :status => :unprocessable_entity
elsif post?
display resource, :status => :created, :location => api_location
elsif put?
display resource, :status=>:ok, :location => api_location
elsif has_empty_resource_definition?
display empty_resource, :status => :ok
else
head :ok
end
end
end
end
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