Synchronizing Core Data With Rails

Synchronizing Core Data With Rails Ken Collins metaskills.net Wednesday, July
14, 2010

Wednesday, July 14, 2010

Why Write Web Applications For The Web Only? Wednesday, July
14, 2010

Why Write Web Applications For The Web <html> Only? Wednesday,
July 14, 2010

Why Write Web Applications For The Web <html> Only? THE
BACK-END (server) Rails Web Application Wednesday, July 14, 2010

FRONT-END (clients) Browser - JavaScript iPhone - Objective-C THE BACK-END (server) Rails Web Application Wednesday, July 14, 2010

The "AJAX Head" Design Pattern Wednesday, July 14, 2010

The "AJAX Head" Design Pattern “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

The "AJAX Head" Design Pattern http:/ /voodootikigod.com/ajax-head-design-pattern http:/ /metaskills.net/2008/5/24/the-ajax-head-br-design-pattern http:/
/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 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

The Backend ( part 1 - web app model )

3.0.0.beta4 Wednesday, July 14, 2010

Data-Interchange... JSON Wednesday, July 14, 2010

Data-Interchange... JSON JSON (JavaScript Object Notation) is a lightweight format.
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

Data-Interchange... JSON JSON (JavaScript Object Notation) is a lightweight format.
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

JSON in Ruby/Rails 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

JSON in Ruby/Rails Specifically in ActiveSupport require 'active_support/json' 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

JSON in Ruby/Rails Specifically in ActiveSupport require 'active_support/json' Object#to_json calls
#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

class Bookmark < ActiveRecord::Base JSON_ATTRS = ['id','owner_id','owner_type','url','name','position'] def as_json(options=nil) attributes.slice(*JSON_ATTRS)
end end JSON in ActiveRecord Wednesday, July 14, 2010

JSON in ActiveRecord class Bookmark < ActiveRecord::Base JSON_ATTRS = ['id','owner_id','owner_type','url','name','position']
def as_json(options=nil) attributes.slice(*JSON_ATTRS) end end class Box < ActiveRecord::Base JSON_ATTRS = ['id','column_id','title','style','collapsed','position'] belongs_to :column has_many :bookmarks, :as => :owner, :order => 'position' acts_as_list :scope => :column_id def as_json(options=nil) attributes.slice(*JSON_ATTRS).merge(:bookmarks => bookmarks) end end Wednesday, July 14, 2010

JSON in ActiveRecord class User < ActiveRecord::Base JSON_ATTRS = ['id','email','uuid'].freeze
has_one :inbox has_one :trashbox has_many :columns, :order => 'position' has_many :boxes, :through => :columns :order => 'columns.position, boxes.position' def as_json(options={}) attributes.slice(*JSON_ATTRS).merge( :inbox => inbox, :trashbox => trashbox, :columns => columns ) end end >> Bookmark.find(27726).to_json => "{\ "position\ ":1,\ "name\ ":\ "Prototype Framework\ ",\ "url\ ":\ "http:/ /prototypejs.org/\ ", \ "owner_id\ ":7181,\ "id\ ":27726,\ "owner_type\ ": \ "Box\ "}" >> Box.find(7181).to_json => "{\ "position\ ":4,\ "title\ ":\ "JavaScript Refs\ ", \ "collapsed\ ":true,\ "id\ ":7181,\ "bookmarks\ ": [{\ "position\ ":1,\ "name\ ":\ "Prototype Framework \ ",\ "url\ ":\ "http:/ /prototypejs.org/\ ",\ "owner_id\ ": 7181,\ "id\ ":27726,\ "owner_type\ ":\ "Box\ "}, {\ "position\ ":2,\ "name\ ":\ "Scriptaclous Framework\ ",\ "url\ ":\ "http:/ /script.aculo.us/\ ", \ "owner_id\ ":7181,\ "id\ ":27725,\ "owner_type\ ": \ "Box\ "},{\ "position\ ":3,\ "name\ ":\ "DevGuru (JavaScript)\ ",\ "url\ ":\ "http:/ / www.devguru.com/technologies/javascript/ home.asp\ ",\ "owner_id\ ":7181,\ "id\ ": 27724,\ "owner_type\ ":\ "Box\ "},{\ "position\ ": 4,\ "name\ ":\ "Dean Edwards Base.js\ ",\ "url\ ": \ "http:/ /dean.edwards.name/weblog/ 2006/03/base/\ ",\ "owner_id\ ":7181,\ "id\ ": 27723,\ "owner_type\ ":\ "Box\ "}],\ "column_id\ ": 3538,\ "style\ ":\ "yellow_green\ "}" Wednesday, July 14, 2010

JSON in ActiveRecord Don’t Over think! There Are Tools For
Everything Use Them Wednesday, July 14, 2010

JSON in ActiveRecord data = "{\"position\": 1,\"name\":\"Prototype Framework\",\"url\": \"http://prototypejs.org/\", \"owner_id\":7181,\"id\":
27726,\"owner_type\":\"Box \"}" Bookmark.new.from_json(data) # => #<Bookmark id: nil, owner_id: nil, url: "http:// prototypejs.org/", name: "Prototype Framework", created_at: nil, position: 0, owner_type: nil, updated_at: nil> Don’t Over think! There Are Tools For Everything Use Them Wednesday, July 14, 2010

The Backend ( part 2 - web app controller )

Changing State Wednesday, July 14, 2010

Changing State CREATE READ UPDATE DELETE DB HTTP INSERT SELECT
UPDATE DELETE POST GET PUT DELETE Wednesday, July 14, 2010

Changing State CREATE READ UPDATE DELETE DB HTTP INSERT SELECT
UPDATE DELETE POST GET PUT DELETE Representational State Transfer (REST) Wednesday, July 14, 2010

Resource Routes Wednesday, July 14, 2010

Resource Routes 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

Resource Routes 1 line 7 actions 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

Resource Routes 1 line 7 actions Collections & Members 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

Resource Routes 1 line 7 actions Collections & Members Current
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

Resource Routes 1 line 7 actions Collections & Members Current
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

Generated URLs $ rake routes CONTROLLER=users GET /users(.:format) {:controller=>"users", :action=>"index"}
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

class BoxesController < ApplicationController def create @box = current_user.columns.find(params[:column_id]).boxes.create! render
: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

Configure Mime Types Mime::Type.register_alias "text/html", :iphone Mime::Type.register_alias "text/html", :myiphoneapp_html Mime::Type.register_alias
"application/json", :myiphoneapp_json Wednesday, July 14, 2010

class ApplicationController < ActionController::Base protect_from_forgery before_filter :set_myiphone_app_request after_filter :brand_response_headers protected
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

The Frontend ( part 1 - core data model )

ObjC RESTful Resource Wednesday, July 14, 2010

ObjC RESTful Resource http:/ /code.google.com/p/json-framework/ http:/ /allseeing-i.com/ASIHTTPRequest/ Wednesday, July 14,
2010

MyApp Singletons // Hard core singleton pattern. [[UIApplication sharedApplication] openURL:...]
[[NSURLCredentialStorage sharedCredentialStorage] allCredentials] // Simple class method singleton pattern. [MyApp mom] // NSManagedObjectModel [MyApp moc] // NSManagedObjectContext [MyApp mocImport] // NSManagedObjectContext [MyApp psc] // NSPersistentStoreCoordinator [MyApp userAgent] // NSString [MyApp queue] // ASINetworkQueue [MyApp myUrlFor:action] // NSURL Wednesday, July 14, 2010

@implementation MyApp + (NSManagedObjectModel *)mom { static NSManagedObjectModel *mom; if
(mom == nil) { mom = [[NSManagedObjectModel mergedModelFromBundles:nil] retain]; } return mom; } + (NSManagedObjectContext *)moc { static NSManagedObjectContext *moc; if (moc == nil) { NSPersistentStoreCoordinator *psc = [self psc]; if (psc != nil) { moc = [[NSManagedObjectContext alloc] init]; [moc setPersistentStoreCoordinator:psc]; [moc setUndoManager:nil]; [moc setStalenessInterval:3.0]; } } return moc; } + (NSManagedObjectContext *)mocImport { // Do same thing above, make sure undo mgr is nil. } + (NSPersistentStoreCoordinator *)psc { static NSPersistentStoreCoordinator *psc; if (psc == nil) // Normal PSC code here. return psc; } @end Core Data Wednesday, July 14, 2010

#pragma mark Network + (ASINetworkQueue *)queue { static ASINetworkQueue *queue;
if (queue == nil) { queue = [[ASINetworkQueue queue] retain]; [queue go]; } return queue; } + (NSURL *)myUrlFor:(NSString *)action { return [NSURL URLWithString:[NSString stringWithFormat:@"http://%@/%@", [self siteHost], action]]; } #pragma mark Device/Bundle // http://www.drobnik.com/touch/2009/07/determining-the-hardware-model/ + (NSString *)userAgent { static NSString *ua; if (ua == nil) { NSString *appVersion = [self appVersion]; NSString *platformString = [[UIDevice currentDevice] platformString]; NSString *systemVersion = [UIDevice currentDevice].systemVersion; ua = [[NSString stringWithFormat:@"HomeMarks iPhone/%@ (%@; %@)", appVersion,platformString,systemVersion] retain]; } return ua; } Misc Wednesday, July 14, 2010

Taming Core Data Wednesday, July 14, 2010

Taming Core Data Set the class for all your models
and generate classes! Wednesday, July 14, 2010

and generate classes! Subclass NSManagedObject to your name space. Wednesday, July 14, 2010

and generate classes! Subclass NSManagedObject to your name space. Make all your generated model classes subclass from above. Wednesday, July 14, 2010

Less Wizardry @implementation MyManagedObject #pragma mark Reflection + (NSEntityDescription *)entity
{ return [[[MyApp mom] entitiesByName] objectForKey:NSStringFromClass(self)]; } + (NSFetchRequest *)fetchRequestForEntity { NSFetchRequest *fetchRequest = [[[NSFetchRequest alloc] init] autorelease]; [fetchRequest setEntity:[self entity]]; return fetchRequest; } @end Wednesday, July 14, 2010

Less Wizardry @implementation MyManagedObject #pragma mark Finders + (MyManagedObject *)objectWithID:(NSString
*)anId { if (anId == nil) return nil; NSURL *myURL = [NSURL URLWithString:anId]; NSManagedObjectID *myId = [[MyApp psc] managedObjectIDForURIRepresentation:myURL]; return (MyManagedObject *)[[MyApp moc] objectWithID:myId]; } - (NSString *)objectIDURLString { return [[[self objectID] URIRepresentation] absoluteString]; } @end x-coredata:/ /EB8922D9- DC06-4256-A21B-DFFD47D7E6DA/MyEntity/p3 Wednesday, July 14, 2010

Create/Import Helpers @implementation MyManagedObject #pragma mark Creators + (id)newObject:(NSDictionary *)attributes
{ return [self newObject:attributes inContext:nil]; } + (id)newObject:(NSDictionary *)attributes inContext:(NSManagedObjectContext *)context { NSManagedObjectContext *moc = context ? context : [MyApp moc]; id mobj = [[self alloc] initWithEntity:[self entity] insertIntoManagedObjectContext:moc]; if (attributes != nil) { for (id key in attributes) { [mobj setValue:[attributes valueForKey:key] forKey:key]; } } return mobj; } @end Wednesday, July 14, 2010

The Frontend ( part 2 - external api ) Wednesday,
July 14, 2010

// Assumes MyRequest & MyFormRequest subclasses of // ASIHTTPRequest and
ASIFormDataRequest (minimal use). @implementation ASIHTTPRequest (MyAdditions) #pragma mark Designated Initializer - (id)initWithMyURL:(NSURL *)newURL { self = [self initWithURL:newURL]; self.username = [MyApp userEmail]; self.password = [MyApp userPass]; self.useCookiePersistance = NO; self.useSessionPersistance = NO; self.useKeychainPersistance = NO; self.allowCompressedResponse = YES; self.shouldRedirect = NO; self.requestMethod = @"GET"; self.delegate = [MyApp appDelegate]; self.didFinishSelector = @selector(globalRequestFinished:); self.didFailSelector = @selector(globalRequestFailed:); [self addRequestHeader:@"HTTP_ACCEPT" value:@"application/json"]; [self addRequestHeader:@"User-Agent" value:[MyApp userAgent]]; return self; } #pragma mark Utility + (NSURL *)urlFor:(NSString *)action { NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://%@/%@",[MyApp siteHost],action]]; return url; } + (MyRequest *)myRequestFor:(NSString *)action { Customize To Your API Wednesday, July 14, 2010

} #pragma mark Utility + (NSURL *)urlFor:(NSString *)action { NSURL
*url = [NSURL URLWithString:[NSString stringWithFormat:@"http://%@/%@",[MyApp siteHost],action]]; return url; } + (MyRequest *)myRequestFor:(NSString *)action { MyRequest *request = [[[MyRequest alloc] initWithMyURL:[self urlFor:action]] autorelease]; return request; } + (MyFormRequest *)myFormRequestFor:(NSString *)action withParams:(NSDictionary *)params { MyFormRequest *request = [[[MyFormRequest alloc] initWithMyURL:[self urlFor:action]] autorelease]; if (params != nil) { for (id key in params) { [request setPostValue:[params objectForKey:key] forKey:key]; } } request.requestMethod = @"POST"; return request; } + (MyFormRequest *)myPutRequestFor:(NSString *)action withParams:(NSDictionary *)params { MyFormRequest *request = [self myFormRequestFor:action withParams:params]; request.requestMethod = @"PUT"; return request; } + (MyRequest *)myDeleteRequestFor:(NSString *)action { MyRequest *request = [self myRequestFor:action]; request.requestMethod = @"DELETE"; return request; } @end Wednesday, July 14, 2010

Import On Launch @implementation ASIHTTPRequest (MyAdditions) + (void)getUserDataFor:(id)aDelegate { MyRequest
*request = [self myRequestFor:@"myhome.json"]; request.delegate = aDelegate; request.didFinishSelector = @selector(didGetUserData:); request.didFailSelector = @selector(didNotGetUserData:); if ([MyApp userEtag] != nil) { [request addRequestHeader:@"If-None-Match" value:[MyApp userEtag]]; } [[MyApp queue] addOperation:request]; } @end Wednesday, July 14, 2010

Import On Launch - (void)didGetUserData:(MyRequest *)request { if ([request isNotModified])
{ [[MyApp appDelegate] didGetUserData]; return; } else { [MyApp setUserEtag:[[request responseHeaders] objectForKey:@"Etag"]]; [self importUserData:[request responseJSON]]; [[MyApp appDelegate] didGetUserData]; } } The Controller (request delegate) Wednesday, July 14, 2010

Import On Launch - (void)didGetUserData:(MyRequest *)request { if ([request isNotModified])
{ [[MyApp appDelegate] didGetUserData]; return; } else { [MyApp setUserEtag:[[request responseHeaders] objectForKey:@"Etag"]]; [self importUserData:[request responseJSON]]; [[MyApp appDelegate] didGetUserData]; } } The Controller (request delegate) "GET /myhome.json HTTP/1.1" 200 5115 "-" "MyApp iPhone/1.0 (iPhone 3GS; 3.1.3)" "GET /myhome.json HTTP/1.1" 304 - "-" "MyApp iPhone/1.0 (iPhone 3GS; 3.1.3)" Apache Logs Wednesday, July 14, 2010

Import On Launch Wednesday, July 14, 2010

Import On Launch class UsersController < ApplicationController def home if
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

Import On Launch class UsersController < ApplicationController def home if
stale?(:etag => current_user) respond_to do |format| format.html { render :layout => 'application' } format.hmiphoneapp_json { render :json => current_user } end end end end @implementation MyAppDelegate - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(clearEtag:) name:NSManagedObjectContextDidSaveNotification object:[HMApp moc]]; //... } - (void)clearEtag:(NSNotification *)notification { [MyApp removeUserEtag]; } @end Wednesday, July 14, 2010

@implementation MyManagedObject #pragma mark MyRequest Handling - (void)createRemoteFinished:(MyRequest *)request {
if ([request isSuccessfulMyAppText]) { NSInteger *remoteInt = [[request responseString] integerValue]; NSNumber *remoteId = [NSNumber numberWithInteger:remoteInt]; [self setValue:remoteId forKey:@"remoteId"]; [self save]; } } @end Models Drive Wednesday, July 14, 2010

@implementation MyManagedObject #pragma mark MyRequest Handling - (void)createRemoteFinished:(MyRequest *)request {
if ([request isSuccessfulMyAppText]) { NSInteger *remoteInt = [[request responseString] integerValue]; NSNumber *remoteId = [NSNumber numberWithInteger:remoteInt]; [self setValue:remoteId forKey:@"remoteId"]; [self save]; } } @end @implementation HMColumn + (void)createRemote { HMColumn *newColumn = [[self class] newObject:nil]; //... [newColumn save]; [MyRequest columnCreate:newColumn]; [newColumn release]; } @end Models Drive Wednesday, July 14, 2010

@implementation HMColumn + (void)createRemote { HMColumn *newColumn = [[self class]
newObject:nil]; //... [newColumn save]; [MyRequest columnCreate:newColumn]; [newColumn release]; } @end @implementation MyRequest + (void)columnCreate:(HMColumn *)column { MyFormRequest *request = [self myFormRequestFor:@"columns" withParams:nil]; request.delegate = column; request.didFinishSelector = @selector(createRemoteFinished:); request.didFailSelector = @selector(createRemoteFailed:); [[HMApp queue] addOperation:request]; } @end Wednesday, July 14, 2010

@implementation HMBox - (void)colorize { if ([[self changedValues] hasKey:@"style"] &&
[self save]) [HMRequest boxColorize:self]; } @end @implementation ASIHTTPRequest (MyAdditions) + (NSString *)box:(HMBox *)box action:(NSString *)action { return [NSString stringWithFormat:@"boxes/%@/%@",[[box remoteId] stringValue],action]; } + (void)boxColorize:(HMBox *)box { NSString *action = [self box:box action:@"colorize"]; NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:box.style,@"color",nil]; MyFormRequest *request = [self myPutRequestFor:action withParams:params]; [[MyApp queue] addOperation:request]; } @end Models Drive (box example) Wednesday, July 14, 2010

The End ( liked my talk – buy my app
- write a review ) Wednesday, July 14, 2010

Synchronizing Core Data With Rails

Synchronizing Core Data With Rails

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