Rails 3：创建身份验证时更新用户属性

class AuthenticationsController < ApplicationController

  def index
    @title = \"Authentications\"
    @authentications = current_user.authentications if current_user
  end

  def create
    # creates omniauth hash and looks for an previously established authentication
    omniauth = request.env[\"omniauth.auth\"]
    authentication = Authentication.find_by_provider_and_uid(omniauth[\'provider\'], omniauth[\'uid\'])
    # if previous authentication found, sign in user
    if authentication
      flash[:notice] = \"Signed in successfully\"
      sign_in_and_redirect(:user, authentication.user)
    #  for users already signed in (current_user), create a new authentication for the user
    elsif current_user
      current_user.apply_share(omniauth)
      current_user.authentications.create(:provider => omniauth[\'provider\'], :uid => omniauth[\'uid\'], :token => (omniauth[\'credentials\'][\'token\'] rescue nil),
                                           :secret => (omniauth[\'credentials\'][\'secret\'] rescue nil))
      flash[:notice] = \"authentications successful\"
      redirect_to authentications_url
    # new user is created and authentications are built through apply_omniauth(omniauth)
    else
      user = User.new
      user.apply_omniauth(omniauth)
      if user.save
        flash[:notice] = \"Signed in successfully\"
        sign_in_and_redirect(:user, user)
      # if validations fail to save user, redirects to new user registration page 
      # new twitter authentications redirect so user can enter their password
      else
        session[:omniauth] = omniauth
        redirect_to new_user_registration_url
      end
     end
   end

  def destroy
    @authentication = current_user.authentications.find(params[:id])
    @authentication.destroy
    flash[:notice] = \"Successfully destroyed authentication.\"
    redirect_to authentications_url
  end

end

## user model

 # set share booleans to true depending on \'provider\' type
  def apply_share(omniauth)
    case omniauth[\'provider\']
      when \'facebook\'
        self.facebook_share = true
      when \'twitter\'
        self.twitter_share = true
     end
   end

 # from authentications controller, new user split into type of provider
 def apply_omniauth(omniauth)
   case omniauth[\'provider\']
   when \'facebook\'
     self.apply_facebook(omniauth)
   when \'twitter\'
     self.apply_twitter(omniauth)
   end
   # builds authentication with provider, uid, token, and secret
   authentications.build(hash_from_omniauth(omniauth))
  end

 protected

 # sets new user attributes from facebook
 def apply_facebook(omniauth)
   self.name = omniauth[\'user_info\'][\'name\']
   self.email = omniauth[\'user_info\'][\'email\'] if email.blank?
   self.facebook_share = true
 end

 # sets new user attributes from twitter 
 def apply_twitter(omniauth)
   if (extra = omniauth[\'extra\'][\'user_hash\'] rescue false)
     # Example fetching extra data. Needs migration to User model:
     # self.firstname = (extra[\'name\'] rescue \'\')
     self.name = (extra[\'name\'] rescue \'\')
     self.bio = (extra[\'description\'] rescue \'\') 
   end
   self.twitter_share = true

 end

 # set authentication attributes to those from \'omniauth\' hash
 def hash_from_omniauth(omniauth)
   {
     :provider => omniauth[\'provider\'],
     :uid => omniauth[\'uid\'],
     :token => (omniauth[\'credentials\'][\'token\'] rescue nil),
     :secret => (omniauth[\'credentials\'][\'secret\'] rescue nil)
   }
 end
end


## new methid with :before add => :apply_share
def apply_share(authentication) 
  case authentication[\'provider\'] 
    when \'facebook\' 
      self.facebook_share = true 
    when \'twitter\'
      self.twitter_share = true 
    end 
  self.save
end