make current_user available in authorizations.rb

application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery
  helper_method :current_user
  private
  def current_user
    @current_user ||= User.find(session[:user_id]) if session[:user_id]
  end

end

authorizations_controller.rb

class AuthorizationsController < ApplicationController

  def index
    @authorizations = Authorization.all
  end

  def create
    auth = request.env['omniauth.auth']
    current_user.authorizations.find_or_create_by_provider(auth['provider'], auth['uid'])
    redirect_to root_url, :notice => "Authorizations successfull"
  end

  def destroy
    @authorization = current_user.authorizations.find(params[:id])
    @authorization.destroy
    redirect_to root_url, :notice => "Successfully destroyed authorizations"
  end

  def failure
  end
end

heroku logs

M", "provider"=>"twitter"}
2012-08-17T14:18:33+00:00 app[web.1]: Completed 500 Internal Server Error in 0ms
2012-08-17T14:18:33+00:00 app[web.1]: 
2012-08-17T14:18:33+00:00 app[web.1]: NoMethodError (undefined method `authorizations' for nil:NilClass):
2012-08-17T14:18:33+00:00 app[web.1]: 
2012-08-17T14:18:33+00:00 app[web.1]:   app/controllers/authorizations_controller.rb:9:in `create'

当前用户是nil, 逻辑错啦.