This is the third part of a multi-part series about moving from devise to the Rails generated authentication system

• Part 1 - Setup and Sessions
• Part 2 - User Sign-in
• Part 3 - Password Recovery
• Part 4 - Email Confirmation Setup
• Part 5 - User Sign-up
• Part 6 - Trackable Module and Tests

The next feature to support is password recovery. Rails' authentication generator + has_secure_password provides a lot of the plumbing for us.

These routes are added (reminder, we're putting these above the existing devise routes) based on the generator:

resources :passwords, only: [:new, :create, :edit, :update], param: :token

A PasswordsController is a near copy/paste from the generator as well:

class PasswordsController < ApplicationController
  rate_limit to: 10, within: 3.minutes, only: [:create, :update], with: lambda {
    redirect_to new_password_path, alert: "Try again later."
  }

  before_action :set_user_by_token, only: [:edit, :update]

  def new
  end

  def edit
  end

  def create
    if (user = User.find_by(email: params.expect(:email)))
      UserMailer.reset_password_instructions(user).deliver_later
    end

    redirect_to new_session_path, notice: "Password reset instructions sent (if user with that email address exists)."
  end

  def update
    if @user.update(password_params)
      redirect_to new_session_path, notice: "Password has been reset."
    else
      redirect_to edit_password_path(params[:token]), alert: "Passwords did not match."
    end
  end

  private
  
  def password_params
    params.expect(:password, :password_confirmation)
  end

  def set_user_by_token
    @user = User.find_by_password_reset_token!(params[:token])
  rescue ActiveSupport::MessageVerifier::InvalidSignature
    redirect_to new_password_path, alert: "Password reset link is invalid or has expired."
  end
end

The biggest change from the default is the email uses UserMailer.reset_password_instructions. Instead of a dedicated password mailer, I chose to use an existing UserMailer.

def reset_password_instructions(user)
  @user = user
  mail subject: "Reset your password", to: user.email
end

The email view is a reused template from devise with a change to the link to point to the new controller.

<p><%= link_to 'Change my password', edit_password_url(@user.password_reset_token) %></p>

The controller views are also copy/pasted devise views that already exist with the form pointing to passwords_path and password_path(params[:token]) for the new and edit actions, respectively.

That completes this feature. Commit to the brand and move on to what's next... Part 3 - New user email confirmations