Ruby on Rails fb_graph在从delayed_job执行时失败，方法字节大小未定义

Question

我正在使用omniauth和delayed_job的组合来与Facebook集成。我有一个Authentication型号，看起来有点像这样：

class Authentication < ActiveRecord::Base
  def account
    @account ||= FbGraph::User.me(token)
  end
  def post_to!(opts = {})
    account.feed!(opts)
  end
end

然后从控制台我可以做这样的事情：

auth.post_to :message => 'Foo bar', :link => 'http://google.com'

一切都很完美，我的Facebook订阅源上也发布了更新。

然而，在应用程序中，我创建了一个自定义的延迟作业，它正是这样做的，只是每次都会失败，并出现以下错误堆栈：

undefined method `bytesize'' for nil:NilClass
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/activesupport-3.1.3/lib/active_support/whiny_nil.rb:48:in `method_missing''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient/http.rb:830:in `block in escape''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/activesupport-3.1.3/lib/active_support/core_ext/string/output_safety.rb:142:in `gsub''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/activesupport-3.1.3/lib/active_support/core_ext/string/output_safety.rb:142:in `gsub''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient/http.rb:829:in `escape''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient/http.rb:822:in `block in escape_query''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient/http.rb:818:in `each''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient/http.rb:818:in `collect''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient/http.rb:818:in `escape_query''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient/http.rb:809:in `create_query_part_str''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient/http.rb:538:in `set_content''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient/http.rb:447:in `init_request''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient/http.rb:705:in `new_request''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient.rb:997:in `create_request''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient.rb:866:in `do_request''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient.rb:756:in `request''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/httpclient-2.2.4/lib/httpclient.rb:666:in `post''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/fb_graph-2.4.7/lib/fb_graph/node.rb:55:in `block in post''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/fb_graph-2.4.7/lib/fb_graph/node.rb:122:in `handle_response''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/fb_graph-2.4.7/lib/fb_graph/node.rb:54:in `post''
  /Users/aaron/.rvm/gems/ruby-1.9.2-p290@bb/gems/fb_graph-2.4.7/lib/fb_graph/connections/feed.rb:15:in `feed!''
  /Users/aaron/Sites/bb/app/models/authentication.rb:40:in `post_to!''
  /Users/aaron/Sites/bb/lib/share_activity_job.rb:39:in `block in perform''
  /Users/aaron/Sites/bb/lib/share_activity_job.rb:11:in `each''
  /Users/aaron/Sites/bb/lib/share_activity_job.rb:11:in `perform''

我已经正式到了把昂贵的电脑扔出窗外的地步。有人能深入了解它为什么失败，为什么在控制台执行时可以工作，但在自定义delayed_job执行时失败吗？

非常感谢您的帮助。非常感谢。

Answer 1

解决方案很简单。您必须在代码中使用to_str：

auth.post_to message: message.to_str, link: 'http://google.com'