nested_parameters_test.rb

require 'test_helper'
require 'action_controller/parameters'

class NestedParametersTest < ActiveSupport::TestCase
  test "permitted nested parameters" do
    params = ActionController::Parameters.new({
      :book=> {
        :title=> "Romeo and Juliet",
        :authors=> [{
          :name=> "William Shakespeare",
          :born=> "1564-04-26"
        }, {
          :name=> "Christopher Marlowe"
        }],
        :details=> {
          :pages=> 200,
          :genre=> "Tragedy"
        }
      },
      :magazine=> "Mjallo!"
    })

    permitted = params.permit :book=> [ :title, { :authors=> [ :name ] }, { :details=> :pages } ]

    assert permitted.permitted?
    assert_equal "Romeo and Juliet", permitted[:book][:title]
    assert_equal "William Shakespeare", permitted[:book][:authors][0][:name]
    assert_equal "Christopher Marlowe", permitted[:book][:authors][1][:name]
    assert_equal 200, permitted[:book][:details][:pages]
    assert_nil permitted[:book][:details][:genre]
    assert_nil permitted[:book][:authors][1][:born]
    assert_nil permitted[:magazine]
  end

  test "nested arrays with strings" do
    params = ActionController::Parameters.new({
      :book=> {
        :genres=> ["Tragedy"]
      }
    })

    permitted = params.permit :book=> :genres
    assert_equal ["Tragedy"], permitted[:book][:genres]
  end

  test "nested array with strings that should be hashes" do       
    params = ActionController::Parameters.new({
      :book=> {
        :genres=> ["Tragedy"]
      }
    })

    permitted = params.permit :book=> { :genres=> :type }
    assert permitted[:book][:genres].empty?
  end

  test "nested array with strings that should be hashes and additional values" do    
    params = ActionController::Parameters.new({
      :book=> {
        :title=> "Romeo and Juliet",
        :genres=> ["Tragedy"]
      }
    })

    permitted = params.permit :book=> [ :title, { :genres=> :type } ]
    assert_equal "Romeo and Juliet", permitted[:book][:title]
    assert permitted[:book][:genres].empty?
  end

  test "nested string that should be a hash" do
    params = ActionController::Parameters.new({
      :book=> {
        :genre=> "Tragedy"
      }
    })

    permitted = params.permit :book=> { :genre=> :type }
    assert_nil permitted[:book][:genre]
  end

  test "fields_for_style_nested_params" do
    params = ActionController::Parameters.new({
      :book => {
        :authors_attributes => {
          :'0' => {:name => 'William Shakespeare', :age_of_death => '52' },
          :'1' => { :name => 'Unattributed Assistant' }
        }
      }
    })
    permitted = params.permit :book => { :authors_attributes => [ :name ] }

    assert_not_nil permitted[:book][:authors_attributes]['0']
    assert_not_nil permitted[:book][:authors_attributes]['1']
    assert_nil permitted[:book][:authors_attributes]['0'][:age_of_death]
    assert_equal 'William Shakespeare', permitted[:book][:authors_attributes]['0'][:name]
    assert_equal 'Unattributed Assistant', permitted[:book][:authors_attributes]['1'][:name]
  end
end