gem 'approval'

class User < ApplicationRecord
  acts_as_approval_user
end

class Book < ApplicationRecord
  acts_as_approval_resource
end

class SomeProcess
  def self.perform
    # something
  end
end

staff = User.find_or_create_by(email: "[email protected]")

record  = Book.new(name: "Ruby Way", price: 2980)
request = staff.request_for_create(record, reason: "something")
request.save # Created Approval::Request record.

records = 10.times.map {|n| Book.new(name: "my_book_#{n}", price: 300) }
request = staff.request_for_create(records, reason: "something")
request.save!

staff = User.find_or_create_by(email: "[email protected]")

record  = Book.find(1).tap {|record| record.name = "new book title" }
request = staff.request_for_update(record, reason: "something")
request.save

records = Book.where(id: [1, 2, 3]).each {|record| record.price *= 0.5 }
request = staff.request_for_update(records, reason: "something")
request.save!

staff = User.find_or_create_by(email: "[email protected]")

record  = Book.find(1)
request = staff.request_for_destroy(record, reason: "something")
request.save

records = Book.where(id: [1, 2, 3])
request = staff.request_for_destroy(records, reason: "something")
request.save!

staff = User.find_or_create_by(email: "[email protected]")

record  = MyProcess.new(recipient: "[email protected]")
request = staff.request_for_perform(record, reason: "something")
request.save

admin = User.find_or_create_by(email: "[email protected]")

request = Approval::Request.first
respond = admin.approve_request(request, reason: "something")
respond.save! # Create/Update/Destroy resources

admin = User.find_or_create_by(email: "[email protected]")

request = Approval::Request.first
respond = admin.reject_request(request, reason: "something")
respond.save!

staff = User.find_or_create_by(email: "[email protected]")

request = Approval::Request.first
respond = staff.cancel_request(request, reason: "something")
respond.save!

admin = User.find_or_create_by(email: "[email protected]")

request = Approval::Request.first
admin.approval_comments.create(request: request, content: "Hello")

# config/initializers/approval.rb

Approval.configure do |config|
  # User Class Name (e.g: User, AdminUser, Member)
  config.user_class_name = "User"

  # Maximum characters of comment for reason (default: 2000)
  config.comment_maximum = 2000

  # Permit to respond to own request? (default: false)
  config.permit_to_respond_to_own_request = false
end