Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
FormObject for building complex forms
Search
Dmytro Piliugin
November 30, 2013
Programming
2
110
FormObject for building complex forms
FormObject for building complex forms
Dmytro Piliugin
November 30, 2013
Tweet
Share
Other Decks in Programming
See All in Programming
Reduxモダナイズ 〜コードのモダン化を通して、将来のライブラリ移行に備える〜
pvcresin
2
690
アメ車でサンノゼを走ってきたよ!
s_shimotori
0
200
Go言語の特性を活かした公式MCP SDKの設計
hond0413
1
200
CSC305 Lecture 03
javiergs
PRO
0
240
Go Conference 2025: Goで体感するMultipath TCP ― Go 1.24 時代の MPTCP Listener を理解する
takehaya
7
1.6k
実践AIチャットボットUI実装入門
syumai
7
2.5k
Swift Concurrency - 状態監視の罠
objectiveaudio
2
480
階層構造を表現するデータ構造とリファクタリング 〜1年で10倍成長したプロダクトの変化と課題〜
yuhisatoxxx
3
940
After go func(): Goroutines Through a Beginner’s Eye
97vaibhav
0
240
CSC305 Lecture 05
javiergs
PRO
0
210
iOSアプリの信頼性を向上させる取り組み/ios-app-improve-reliability
shino8rayu9
0
160
CSC509 Lecture 02
javiergs
PRO
0
410
Featured
See All Featured
Fireside Chat
paigeccino
40
3.7k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
36
2.5k
Thoughts on Productivity
jonyablonski
70
4.9k
How STYLIGHT went responsive
nonsquared
100
5.8k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
32
2.2k
Into the Great Unknown - MozCon
thekraken
40
2.1k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
162
15k
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.9k
Being A Developer After 40
akosma
91
590k
Distributed Sagas: A Protocol for Coordinating Microservices
caitiem20
333
22k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
33
2.5k
Transcript
FormObject for building complex forms Dmytro Piliugin @suaron
[email protected]
MVC Model Controller View
MVC Model Controller View
MVC Model Controller View FromObject
None
None
None
1 class SignupsController < ApplicationController! 2 def new! 3 @signup_form
= SignUpForm.new! 4 end! 5 ! 6 def create! 7 @signup_form = SignUpForm.new(params)! 8 if @signup_form.save! 9 redirect_to home_path! 10 else! 11 render :new! 12 end! 13 end! 14 end
1 class SignUpForm! 2 include ActiveModel::Model! 3 ! 4 attr_reader
:user! 5 attr_reader :items! 6 ! 7 def initialize(params = {})! 8 @user = User.new(user_params(params))! 9 @items = build_items(items_params(params))! 10 end! 11 ! 12 def build_items(items_attributes)! 13 items_attributes.map do |attributes|! 14 Item.new(attributes)! 15 end! 16 end! 17 ! 18 def user_params(params)! 19 params.fetch(:user, {}).slice(:email).to_hash! 20 end! 21 ! 22 def items_params(params)! 23 params.fetch(:user, {}).fetch(:items, {}).values.map do |item_hash|! 24 item_hash.slice(:title).to_hash! 25 end! 26 end! 27 ! 28 end
1 class SignUpForm! 2 include ActiveModel::Model! 3! 4 ...! 5
! 6 def save! 7 valid? && persist! 8 end! 9 ! 10 validate :at_least_one_item_should_be_presence! 12 def at_least_one_item_should_be_presence! 13 if @items.empty?! 14 errors.add(:items, 'at least one should be present')! 14 end! 15 end! 16 ! 17 def valid?! 18 super! 19 @user.valid?! 20 @items.each(&:valid?)! 21 errors.empty? && @user.errors.empty? \! 22 && @items.all?{ |item| item.errors.empty? }! 23 end! 24 ! 25 ...! 26! 27 end
1 class SignUpForm! 2 include ActiveModel::Model! 3 ! 4 ...!
18 ! 19 def save! 20 valid? && persist! 21 end! 22 ! 23 ...! 34! 41 private! 42 def persist! 43 ActiveRecord::Base.transaction do! 44 company = Company.create!! 45 order = company.orders.create!! 46 ! 47 @user.company = company! 48 @user.save!! 49 ! 50 @items.each do |item|! 51 item.order = order! 52 item.save!! 53 end! 54 ! 55 return true! 56 end! 57 end! 58 ! 59 ...! 87! 88 end
41 private! 42 def persist! 43 ActiveRecord::Base.transaction do! 44 company
= Company.create!! 45 order = company.orders.create!! 46 ! 47 @user.company = company! 48 @user.save!! 49 ! 50 @items.each do |item|! 51 item.order = order! 52 item.save!! 53 end! 54 ! 55 AdminMailer.delay.notify(order.id)! 56 ! 57 return true! 58 end! 59 end
41 private! 42 def persist! 43 ActiveRecord::Base.transaction do! 44 company
= Company.create!! 45 order = company.orders.create!! 46 ! 47 @user.company = company! 48 @user.save!! 49 ! 50 @items.each do |item|! 51 item.order = order! 52 authorize_and_save(item)! 53 end! 54 ! 55 return true! 56 end! 57 end! 58 ! 59 def authorize_and_save(object)! 60 if current_ability.can?(:create, object)! 61 object.save!! 62 else! 63 errors.add(:security, "not authorised")! 64 raise ActiveRecord::Rollback! 65 end! 66 end
slides: https://speakerdeck.com/suaron/ formobject-for-building-complex-forms/ code: http://github.com/suaron/fo
References • http://railscasts.com/episodes/416-form-objects • http://matthewrobertson.org/blog/2012/09/20/ decoupling-rails-forms-from-the-database/ • http://robots.thoughtbot.com/activemodel-form- objects •
http://pivotallabs.com/form-backing-objects-for-fun- and-profit/
Q/A