Dealing with Service Objects

Conversation starter about working with service objects in Rails, given at Ruby/Rails Sofia meetup

Transcript

1. Dealing with Service Objects Radoslav Stankov 23/11/2016
2. Radoslav Stankov @rstankov http://rstankov.com http://github.com/rstankov
3. https://www.youtube.com/watch?v=p5EIrSM8dCA
9. https://www.youtube.com/watch?v=v6UhbI84nmA
15. ActiveRecord Objects
16. ActiveRecord Objects Other
 Objects Other
 Objects Other
 Objects Other
 Objects Other
 Objects Other
 Objects Other
 Objects
17. Service Objects
18. UseCase Objects
19. Interactors Objects
20. Operation Objects
21. module DoStuff extend self def call(...) ... end private ... end
22. module UserDeactivator extend self def call(user, active: active) return if user.active == active user.update! active: active user.posts.update_all active: active user.votes.update_all active: active user.comments.update_all active: active user.following_association.update_all active: active user.followers_association.update_all active: active end end
23. Validations?
24. module SendPrivateMessage extend self def call(message, recipient, sender) return :invalid unless recipient.present? return :invalid unless recipient.receive_private_messages? message = Message.new message, sender, recipient return :not_saved unless message.save MessageMailer.user_message(message).deliver_later Metrics.track_create message, by: sender :success end end
25. Forms?
26. class RegistrationController < ApplicationController def create @user = User.new(user_params) @user.account = Account.new(account_params) @user.account.owner = @user if @user.valid? && @user.account.valid? @user.save! @user.account.save! AccountWasCreated.perform_later(account) redirect_to user_path(@user) else render :new end end end
27. class RegistrationController < ApplicationController def create @registration = RegistrationForm.new(registration_params) if @registration.save redirect_to user_path(@registration.user) else render :new end end end
28. class RegistrationController < ApplicationController def create @registration = RegistrationForm.new(registration_params) @registration.save respond_with @registration end end
29. class RegistrationForm include ActiveModel::Model attr_reader :user, :account attr_accessor :first_name, :last_name, :email, :name, :plan, :te # user validation validates :first_name, presence: true validates :last_name, presence: true validates :email, presence: true, email: true # account validation validates :account_name, presence: true # form custom validation validates :plan, inclusion: {in AccountPlan::VALUES} validates :terms_of_service, acceptance: true # ensure uniqueness
30. validates :account_name, presence: true # form custom validation validates :plan, inclusion: {in AccountPlan::VALUES} validates :terms_of_service, acceptance: true # ensure uniqueness validate :ensure_unique_user_email validate :ensure_unique_account_name def initialize @user = User.new @account = Account.new owner: @user end def update(attributes) attributes.each do |name, value| public_send "#{name}=", value end if valid? & user.update(user_attributes) && account.update(acco account.users << user AccountWasCreated.perform_later(account) else
31. def update(attributes) attributes.each do |name, value| public_send "#{name}=", value end if valid? & user.update(user_attributes) && account.update(acco account.users << user AccountWasCreated.perform_later(account) else false end end private def ensure_unique_user_email errors.add :email, 'already taken' if User.where(email: email). end def ensure_unique_account_name errors.add :name, 'already taken' if Account.where(name: name). end
32. else false end end private def ensure_unique_user_email errors.add :email, 'already taken' if User.where(email: email). end def ensure_unique_account_name errors.add :name, 'already taken' if Account.where(name: name). end def user_attributes {first_name: first_name, last_name: last_name, email: email} end def account_attributes {plan: plan, name: name} end end
33. https://github.com/RStankov/MiniForm
34. class RegistrationForm include MiniForm::Model model :user, attributes: %i(first_name last_name email), save: t model :account, attributes: %i(name plan), save: true attributes :terms_of_service validates :plan, inclusion: {in AccountPlan::VALUES} validates :terms_of_service, acceptance: true def initialize @user = User.new @account = Account.new owner: @user end def perform account.users << user AccountWasCreated.perform_later(account) end end
35. Readability?
36. Authorization?
37. Pipelines?
38. Trailbrazer? http://trailblazer.to/gems/operation/2.0/