Password doesn't get updated for user in rails after reseting

I previously had a page as settings to update the user details in rails. On that time the password gets updated without any issue. But now I used a password reset option for the users who forgot their password. They will receive a mail and then they reset the password. After adding this feature both the updating inside the account and via mail does not happen.

password_reset controller:

def update

  @user = User.find_by_password_reset_token!(params[:id])
  if @user.password_reset_sent_at < 2.hour.ago
    flash[:notice] = 'Password reset has expired'

    redirect_to new_password_reset_path

  elsif @user.update_attributes(params[:user])// this condition fails. I don't know why it fails.

    flash[:notice] = 'Password has been reset!'
    redirect_to new_session_path
  else
   redirect_to new_session_path
  end

user.rb

  validates :password, presence: true, length: { minimum: 6 } 
  validates :password_confirmation, presence: true 
  before_save { |user| user.email = email.downcase }
  before_save :create_remember_token


  private

    def create_remember_token
      self.remember_token = SecureRandom.urlsafe_base64
    end

    def generate_token(column)
      begin
        self[column] = SecureRandom.urlsafe_base64
      end while User.exists?(column => self[column])
    end

These filters I used in user controller

 before_filter :signed_in_user, only: [:edit, :update, :requestuser]
 before_filter :correct_user,   only: [:edit, :update]
 before_filter :admin_user,     only: :destroy

I am new to rails and learning. Need help. The same filter I used before password reset I dont know why it fails. It first worked for few days now it fails.