Lessons learned from building HomeMarks native iPhone application to synchronize Core Data with a RESTful backend built using rails 3.0.0.pre. This covers a previous design methodology called the AJAX
forces the view and controller to work in isolation with the most minimal coupling possible. Kind of like a web service.” “...an implementation pattern that drastically modi es common web client-server interactions in order to bring them more closely in line with enterprise client-server interactions...” Wednesday, July 14, 2010
/metaskills.net/2008/6/18/restful-ajax-with-forgery-protection “e AJAX head design pattern forces the view and controller to work in isolation with the most minimal coupling possible. Kind of like a web service.” “...an implementation pattern that drastically modi es common web client-server interactions in order to bring them more closely in line with enterprise client-server interactions...” Wednesday, July 14, 2010
FRONT-END (clients) Browser - JavaScript iPhone - Objective-C THE BACK-END (server) Rails Web Application 1) AR Model 2) Controller Wednesday, July 14, 2010
FRONT-END (clients) Browser - JavaScript iPhone - Objective-C THE BACK-END (server) Rails Web Application 1) AR Model 2) Controller 1) CoreData Models 2) External API Wednesday, July 14, 2010
It is easy for humans to read and write. It is easy for machines to parse and generate. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. Wednesday, July 14, 2010
It is easy for humans to read and write. It is easy for machines to parse and generate. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. http:/ /www.json.org/ Wednesday, July 14, 2010
self,options) end def as_json(options = nil) instance_values end end class Foo attr_accessor :bar end f = Foo.new f.bar = 'batz' puts f.to_json # => {"bar":"batz"} Wednesday, July 14, 2010
def to_json(options = nil) ActiveSupport::JSON.encode( self,options) end def as_json(options = nil) instance_values end end class Foo attr_accessor :bar end f = Foo.new f.bar = 'batz' puts f.to_json # => {"bar":"batz"} Wednesday, July 14, 2010
#as_json to coerce itself into something natively encodable like Hash, Integer, or String. Override #as_json instead of #to_json so you're JSON library agnostic. class Object def to_json(options = nil) ActiveSupport::JSON.encode( self,options) end def as_json(options = nil) instance_values end end class Foo attr_accessor :bar end f = Foo.new f.bar = 'batz' puts f.to_json # => {"bar":"batz"} Wednesday, July 14, 2010
#as_json to coerce itself into something natively encodable like Hash, Integer, or String. Override #as_json instead of #to_json so you're JSON library agnostic. ActiveSupport::JSON does all the work of defining #as_json on all core ruby objects. It also abstracts out decoding with hot swappable backends using ActiveSupport::JSON.backend = 'JSONGem'. class Object def to_json(options = nil) ActiveSupport::JSON.encode( self,options) end def as_json(options = nil) instance_values end end class Foo attr_accessor :bar end f = Foo.new f.bar = 'batz' puts f.to_json # => {"bar":"batz"} Wednesday, July 14, 2010
#as_json to coerce itself into something natively encodable like Hash, Integer, or String. Override #as_json instead of #to_json so you're JSON library agnostic. ActiveSupport::JSON does all the work of defining #as_json on all core ruby objects. It also abstracts out decoding with hot swappable backends using ActiveSupport::JSON.backend = 'JSONGem'. In rails, with ActiveSupport, primitive ruby objects serialize their instance variables using another core extension Object#instance_values which returns a Hash of said ivars. class Object def to_json(options = nil) ActiveSupport::JSON.encode( self,options) end def as_json(options = nil) instance_values end end class Foo attr_accessor :bar end f = Foo.new f.bar = 'batz' puts f.to_json # => {"bar":"batz"} Wednesday, July 14, 2010
:columns do collection { put :sort } member { delete :destroy_boxes } end resources :boxes do collection { put :sort } member do put :toggle_collapse put :colorize put :change_title end end end Wednesday, July 14, 2010
:users resource :session resources :columns do collection { put :sort } member { delete :destroy_boxes } end resources :boxes do collection { put :sort } member do put :toggle_collapse put :colorize put :change_title end end end Wednesday, July 14, 2010
do |map| resources :users resource :session resources :columns do collection { put :sort } member { delete :destroy_boxes } end resources :boxes do collection { put :sort } member do put :toggle_collapse put :colorize put :change_title end end end Wednesday, July 14, 2010
User Scope Implied Homemarks::Application.routes.draw do |map| resources :users resource :session resources :columns do collection { put :sort } member { delete :destroy_boxes } end resources :boxes do collection { put :sort } member do put :toggle_collapse put :colorize put :change_title end end end Wednesday, July 14, 2010
User Scope Implied You will PUT Homemarks::Application.routes.draw do |map| resources :users resource :session resources :columns do collection { put :sort } member { delete :destroy_boxes } end resources :boxes do collection { put :sort } member do put :toggle_collapse put :colorize put :change_title end end end Wednesday, July 14, 2010
POST /users(.:format) {:controller=>"users", :action=>"create"} GET /users/new(.:format) {:controller=>"users", :action=>"new"} GET /users/:id(.:format) {:controller=>"users", :action=>"show"} PUT /users/:id(.:format) {:controller=>"users", :action=>"update"} DELETE /users/:id(.:format) {:controller=>"users", :action=>"destroy"} GET /users/:id/edit(.:format) {:controller=>"users", :action=>"edit"} Wednesday, July 14, 2010
:json => @box.id end def sort @box.insert_at params[:position] ; head :ok end def toggle_collapse @box.toggle(:collapsed).save! ; head :ok end end class SessionsController < ApplicationController def create self.current_user = User.authenticate params[:email], params[:password] logged_in? ? head(:ok) : render(:json => login_failures, :status => :unauthorized) end end RESTful Actions Wednesday, July 14, 2010
def myiphone_app_request? request.env["HTTP_USER_AGENT"] && request.env["HTTP_USER_AGENT"][/HomeMarks iPhone\/\d\.\d/] end def set_myiphone_app_request if myiphone_app_request? case request.format.symbol when :json then request.format = :myiphoneapp_json when :html then request.format = :myiphoneapp_html end end end def brand_response_headers response.headers['X-Homemarks'] = '3.0' end def set_iphone_request request.format = :iphone if iphone_request? end def iphone_request? !myiphone_app_request? && request.env["HTTP_USER_AGENT"] && request.env["HTTP_USER_AGENT"][/(iPhone|iPod)/] end def protect_against_forgery? myiphone_app_request? ? false : super end end Critical Support Wednesday, July 14, 2010
stale?(:etag => current_user) respond_to do |format| format.html { render :layout => 'application' } format.hmiphoneapp_json { render :json => current_user } end end end end Wednesday, July 14, 2010
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