Customized Devise

redirection for signup and update

# in routes.rb
devise_for :users, :controllers => { :registrations => "registrations" }

class RegistrationsController < Devise::RegistrationsController
  protected

  def after_sign_up_path_for(resource)
    # anywhere you want to go
  end

  def after_update_path_for(resource)
    # anywhere you want to go
  end  
end

update resource without password

# override the update_with_password method in Resource

def update_with_password(params={})
  current_password = params.delete(:current_password)

  if params[:password].blank?
    params.delete(:password)
    params.delete(:password_confirmation) if params[:password_confirmation].blank?
  end
  # result = if valid_password?(current_password)
  result = if params[:password].blank? && params[:password_confirmation].blank? || valid_password?(current_password) 
    update_attributes(params)
  else
    self.attributes = params
    self.valid?
    self.errors.add(:current_password, current_password.blank? ? :blank : :invalid)
    false
  end

  clean_up_passwords
  result
end