Custom form models

README

http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/ 

O rly? Duplikacja atrybutów, duplikacja walidacji, pozdro z walidacja typu uniqueness of albo cokolwiek innego co hituje bazy per model.

controller.rb

class SignUpController
  def new
    @form = SignUpForm.new()
  end

  def create
    @form = SignUpForm.new(params[:sign_up_form])
    if @form.valid?
      @form.save!
    else
      render :new
    end
  end
end

model.rb

class User
end

class Account
  belongs_to :user
end

class Actor
  belongs_to :user
  belongs_to :actor
end

class SignUpForm
  extend ActiveModel::Naming
  include ActiveModel::Conversion

  attr_reader :user
  attr_reader :actor
  attr_reader :account

  def initialize(attrs = {})
    @user = User.new(attrs[:user])

    @account = Account.new(attrs[:account])
    @account.user = @user

    @actor = Actor.new.tap do |a|
      a.user = @user
      a.account = @account
      a.role = "owner"
    end
  end

  def persisted?
    false
  end

  def valid?
    [@user, @account, @actor].map(&:valid?).inject(true){|a,b| a && b}
  end

  def save!
    User.transaction do
      @user.save!
      @account.save!
      @actor.save!
    end
  end
end

new.html.haml

= semantic_form_for @form do |f|
  = f.fields_for :user, @form.user do |ff|
    = ff.input :email
    = ff.input :password
    = ff.input :password_confirmation
    = ff.input :name

  = f.fields_for :account, @form.account do |ff|
    = ff.input :name, :label => "Account name"
    = ff.input :domain

  = f.actions do
    = f.action :submit, :as => :button, :label => "Sign up"