rails--rails/activemodel/test/cases/serialization_test.rb

require "cases/helper"
require 'active_support/core_ext/object/instance_variables'

class SerializationTest < ActiveModel::TestCase
  class User
    include ActiveModel::Serialization

    attr_accessor :name, :email, :gender, :address, :friends

    def initialize(name, email, gender)
      @name, @email, @gender = name, email, gender
      @friends = []
    end

    def attributes
      instance_values.except("address", "friends")
    end

    def method_missing(method_name, *args)
      if method_name == :bar
        'i_am_bar'
      else
        super
      end
    end

    def foo
      'i_am_foo'
    end
  end

  class Address
    include ActiveModel::Serialization

    attr_accessor :street, :city, :state, :zip

    def attributes
      instance_values
    end
  end

  setup do
    @user = User.new('David', 'david@example.com', 'male')
    @user.address = Address.new
    @user.address.street = "123 Lane"
    @user.address.city = "Springfield"
    @user.address.state = "CA"
    @user.address.zip = 11111
    @user.friends = [User.new('Joe', 'joe@example.com', 'male'),
                     User.new('Sue', 'sue@example.com', 'female')]
  end

  def test_method_serializable_hash_should_work
    expected = {"name"=>"David", "gender"=>"male", "email"=>"david@example.com"}
    assert_equal expected, @user.serializable_hash
  end

  def test_method_serializable_hash_should_work_with_only_option
    expected = {"name"=>"David"}
    assert_equal expected, @user.serializable_hash(only: [:name])
  end

  def test_method_serializable_hash_should_work_with_except_option
    expected = {"gender"=>"male", "email"=>"david@example.com"}
    assert_equal expected, @user.serializable_hash(except: [:name])
  end

  def test_method_serializable_hash_should_work_with_methods_option
    expected = {"name"=>"David", "gender"=>"male", "foo"=>"i_am_foo", "bar"=>"i_am_bar", "email"=>"david@example.com"}
    assert_equal expected, @user.serializable_hash(methods: [:foo, :bar])
  end

  def test_method_serializable_hash_should_work_with_only_and_methods
    expected = {"foo"=>"i_am_foo", "bar"=>"i_am_bar"}
    assert_equal expected, @user.serializable_hash(only: [], methods: [:foo, :bar])
  end

  def test_method_serializable_hash_should_work_with_except_and_methods
    expected = {"gender"=>"male", "foo"=>"i_am_foo", "bar"=>"i_am_bar"}
    assert_equal expected, @user.serializable_hash(except: [:name, :email], methods: [:foo, :bar])
  end

  def test_should_raise_NoMethodError_for_non_existing_method
    assert_raise(NoMethodError) { @user.serializable_hash(methods: [:nada]) }
  end

  def test_should_use_read_attribute_for_serialization
    def @user.read_attribute_for_serialization(n)
      "Jon"
    end

    expected = { "name" => "Jon" }
    assert_equal expected, @user.serializable_hash(only: :name)
  end

  def test_include_option_with_singular_association
    expected = {"name"=>"David", "gender"=>"male", "email"=>"david@example.com",
                "address"=>{"street"=>"123 Lane", "city"=>"Springfield", "state"=>"CA", "zip"=>11111}}
    assert_equal expected, @user.serializable_hash(include: :address)
  end

  def test_include_option_with_plural_association
    expected = {"email"=>"david@example.com", "gender"=>"male", "name"=>"David",
                "friends"=>[{"name"=>'Joe', "email"=>'joe@example.com', "gender"=>'male'},
                           {"name"=>'Sue', "email"=>'sue@example.com', "gender"=>'female'}]}
    assert_equal expected, @user.serializable_hash(include: :friends)
  end

  def test_include_option_with_empty_association
    @user.friends = []
    expected = {"email"=>"david@example.com", "gender"=>"male", "name"=>"David", "friends"=>[]}
    assert_equal expected, @user.serializable_hash(include: :friends)
  end

  class FriendList
    def initialize(friends)
      @friends = friends
    end

    def to_ary
      @friends
    end
  end

  def test_include_option_with_ary
    @user.friends = FriendList.new(@user.friends)
    expected = {"email"=>"david@example.com", "gender"=>"male", "name"=>"David",
                "friends"=>[{"name"=>'Joe', "email"=>'joe@example.com', "gender"=>'male'},
                           {"name"=>'Sue', "email"=>'sue@example.com', "gender"=>'female'}]}
    assert_equal expected, @user.serializable_hash(include: :friends)
  end

  def test_multiple_includes
    expected = {"email"=>"david@example.com", "gender"=>"male", "name"=>"David",
                "address"=>{"street"=>"123 Lane", "city"=>"Springfield", "state"=>"CA", "zip"=>11111},
                "friends"=>[{"name"=>'Joe', "email"=>'joe@example.com', "gender"=>'male'},
                           {"name"=>'Sue', "email"=>'sue@example.com', "gender"=>'female'}]}
    assert_equal expected, @user.serializable_hash(include: [:address, :friends])
  end

  def test_include_with_options
    expected = {"email"=>"david@example.com", "gender"=>"male", "name"=>"David",
                "address"=>{"street"=>"123 Lane"}}
    assert_equal expected, @user.serializable_hash(include: { address: { only: "street" } })
  end

  def test_nested_include
    @user.friends.first.friends = [@user]
    expected = {"email"=>"david@example.com", "gender"=>"male", "name"=>"David",
                "friends"=>[{"name"=>'Joe', "email"=>'joe@example.com', "gender"=>'male',
                            "friends"=> [{"email"=>"david@example.com", "gender"=>"male", "name"=>"David"}]},
                            {"name"=>'Sue', "email"=>'sue@example.com', "gender"=>'female', "friends"=> []}]}
    assert_equal expected, @user.serializable_hash(include: { friends: { include: :friends } })
  end

  def test_only_include
    expected = {"name"=>"David", "friends" => [{"name" => "Joe"}, {"name" => "Sue"}]}
    assert_equal expected, @user.serializable_hash(only: :name, include: { friends: { only: :name } })
  end

  def test_except_include
    expected = {"name"=>"David", "email"=>"david@example.com",
                "friends"=> [{"name" => 'Joe', "email" => 'joe@example.com'},
                             {"name" => "Sue", "email" => 'sue@example.com'}]}
    assert_equal expected, @user.serializable_hash(except: :gender, include: { friends: { except: :gender } })
  end

  def test_multiple_includes_with_options
    expected = {"email"=>"david@example.com", "gender"=>"male", "name"=>"David",
                "address"=>{"street"=>"123 Lane"},
                "friends"=>[{"name"=>'Joe', "email"=>'joe@example.com', "gender"=>'male'},
                           {"name"=>'Sue', "email"=>'sue@example.com', "gender"=>'female'}]}
    assert_equal expected, @user.serializable_hash(include: [{ address: {only: "street" } }, :friends])
  end
end