post_via_redirect is deprecated and will be removed in Rails 5.1

Question

I look at the Rails Tutorial Book and in chapter 8, when I run the bin / rails test, I received this message:

 DEPRECATION WARNING: `post_via_redirect` is deprecated and will be removed in Rails 5.1. Please use follow_redirect! manually after the request call for the same behavior.

The code generating this message is located at test/integration/user_signup_test.rb:

      test "valid signup information" do
        get signup_path
        assert_difference 'User.count', 1 do
          post_via_redirect users_path, user: { name:  "Example User",
                                        email: "[e-mail]",
                                        password:              "password",
                                        password_confirmation: "password" }
        end
        assert_template 'users/show'
      end

How to fix it?

Answer 1

Fixed code

test "valid signup information" do
  get signup_path
  assert_difference 'User.count', 1 do
    post users_path, params: { user: { name:  "Example User",
                                        email: "[e-mail]",
                                        password:              "password",
                                        password_confirmation: "password" } } 
    follow_redirect!
  end
  assert_template 'users/show'
end

NOTE. I also added a hash paramsas suggested by Rails 5.