Devise: Disable password confirmation during sign-up

Question

I am using Devise for Rails. In the default registration process, Devise requires users to type the password twice for validation and authentication. How can I disable it?

Answer 1

To disable password confirmation you can simply remove the password_confirmation field from the registration form. This disables the need to confirm the password entirely!

1. Generate devise views if you haven't: rails g devise:views
2. Remove the password_confirmation section in app\views\devise\registrations\new.html.erb

One way to do it:

<%# Disable password confirmation so that the user doesn't have to enter a password twice %>
<% if false %>
  <div class="field">
    <%= f.label :password_confirmation %><br />
    <%= f.password_field :password_confirmation, autocomplete: "new-password" %>
  </div>
<% end %>

---

The reason why this works lies in lib/devise/models/validatable.rb in the Devise source:

module Devise
  module Models
    module Validatable


      def self.included(base)

        base.class_eval do
          #....SNIP...
          validates_confirmation_of :password, :if => :password_required?
        end
      end

      #...SNIP...

      def password_required?
        !persisted? || !password.nil? || !password_confirmation.nil?
      end
    end
  end
end

Note that the validation is only triggered if password_required? returns true, and password_required? will return false if the password_confirmation field is nil.

Because where the password_confirmation field is present in the form, it will always be included in the parameters hash , as an empty string if it is left blank, the validation is triggered. However, if you remove the input from the form, the password_confirmation in the params will be nil, and therefore the validation will not be triggered.