How to fix ArgumentError: wrong number of arguments (given 0, expected 1) - RoR

Question

I'm beginner and in the mailer code Ruby on Rails I have an error "ArgumentError: wrong number of arguments (given 0, expected 1)" between my code and his test.

Error:

UtilisateurMailerTest#test_account_activation:

ArgumentError: wrong number of arguments (given 0, expected 1)
    app/mailers/utilisateur_mailer.rb:8:in `account_activation'
    test/mailers/utilisateur_mailer_test.rb:6 

utilisateur_mailer_test.rb:

class UtilisateurMailerTest < ActionMailer::TestCase
  test "account_activation" do
           mail = UtilisateurMailer.account_activation
(line6)    assert_equal "Account activation", mail.subject
           assert_equal ["to@example.org"], mail.to
           assert_equal ["from@example.com"], mail.from
           assert_match "Hi", mail.body.encoded
  end

utilisateur_mailer.rb: ........

Line8:
  def account_activation(utilisateur)
    @utilisateur = utilisateur
    mail to: utilisateur.email, subject: "Activation du compte"
  end

I've tryed to delete ", mail.subject" and the subject: "Activation du compte" and it returns: ArgumentError: wrong number of arguments (given 1, expected 2..3)

I'm a novice.. thanks for your answers!

Answer 1

has you can see the error message is telling you that one of your method is waiting for an argument but nothing was passed to it.

In your utilisateur_mailer_test.rb , you can see that you are calling the method account_activation that you created in the utilisateur_mailer.rb .

As you can see this method needs an utilisateur parameter to be executed but when you are calling this method inside of your utilisateur_mailer_test.rb , you are not passing anything to it: mail = UtilisateurMailer.account_activation

You must specify an utilisateur argument here by creating a user through a factory using FactoryBot with Faker for example.

Good luck: :)

Answer 2

I faced this issue while upgrading from Rails v5.2.3 to v5.2.4 and fixed it by upgrading the following gem

gem 'awesome_nested_set', '~> 3.2.0'