RailsでのServiceの使い方2

Implement in Controller

bash

vi app/controllers/bank_accounts_controller.rb

bank_accounts_controller.rb

def transfer_money
  from = BankAccount.find 1
  to = BankAccount.find 2
  BankAccount.transaction do
    to.money += from.money
    from.money = 0
    from.save!
    to.save!
  end

  render text: 'success'
end

Implement in Model

vi app/controllers/bank_accounts_controller.rb

bank_accounts_controller.rb

def transfer_money
  BankAccount.transfer_money(1, 2)

  render text: 'success'
end

bash

vi app/models/bank_account.rb

app/models/bank_account.rb

class BankAccount < ActiveRecord::Base
  class << self
    def transfer_money(f, t)
      from = BankAccount.find f
      to = BankAccount.find t
      self.transaction do
        to.money += from.money
        from.money = 0
        from.save!
        to.save!
      end
    end
  end
end

Implement in Service

bash

mkdir app/services

bash

vi config/application.rb 

Add this line.
It might not need it.
You can check like this.

irb

puts ActiveSupport::Dependencies.autoload_paths

application.rb

config.autoload_paths += %W(#{config.root}/app/services)

restart rails

bash

rails s -b 0.0.0.0

bash

vi app/services/bank_account_transfer_service.rb

bank_account_transfer_service.rb

class BankAccountTransferService
  def initialize(f, t)
    @from = BankAccount.find f
    @to = BankAccount.find t
  end

  def transfer_money
    BankAccount.transaction do
      @to.money += @from.money
      @from.money = 0
      @from.save!
      @to.save!
    end
  end
end

bash

vi app/controllers/bank_accounts_controller.rb

bank_accounts_controller.rb

def transfer_money
  bat_service = BankAccountTransferService.new(1,2)
  bat_service.transfer_money

  render text: 'success'
end