Rails 项目：NoMethodError：字符串的未定义方法"标识符"

Question

我最近继承了一个Rails+Spine.JS项目。尽管它的主题不是非常神秘的（面向市场：人们制作自己的邮件列表，在发送内容之前准备内容，实际发送内容等），但它的实现是特定的，并且依赖于多个Rails覆盖（如下面问题2中指定的）。

我有两个问题需要帮助。

问题一：

关键是：在Spine.JS应用程序（前端）中，我们得到了发票的预览操作，该操作应该（而且确实）打开一个新的选项卡来执行。在我真的这么做之前，一切看起来都很正常。没有太多毫无意义的解释，下面是发生的事情：

Started GET "/me/invoices/22/preview?oauth_token=XE03DFCGyCDYjdu8oWuU9zrN56Z6Wr7eZDuIjCbT&origin=http://localhost:9294" for 94.26.14.131 at 2013-12-08 00:55:27 +0200
  Oauth2Token Load (0.3ms)  SELECT `oauth_tokens`.* FROM `oauth_tokens` WHERE `oauth_tokens`.`type` IN ('Oauth2Token') AND (invalidated_at IS NULL AND authorized_at IS NOT NULL and token = 'XE03DFCGyCDYjdu8oWuU9zrN56Z6Wr7eZDuIjCbT') LIMIT 1
Processing by InvoicesController#preview as HTML
  Parameters: {"oauth_token"=>"XE03DFCGyCDYjdu8oWuU9zrN56Z6Wr7eZDuIjCbT", "origin"=>"http://localhost:9294", "id"=>"22"}
  User Load (0.4ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 270932 LIMIT 1
  Invoice Load (0.2ms)  SELECT `receipts`.* FROM `receipts` WHERE `receipts`.`type` IN ('Invoice') AND `receipts`.`id` = 22 LIMIT 1
Completed 500 Internal Server Error in 8.3ms
NoMethodError (undefined method `identifier' for "preview":String):
  newrelic_rpm (3.6.9.171) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:157:in     `render_with_newrelic'
  actionpack (3.2.16) lib/action_view/renderer/renderer.rb:36:in `render_template'
  actionpack (3.2.16) lib/action_view/renderer/renderer.rb:17:in `render'
  actionpack (3.2.16) lib/abstract_controller/rendering.rb:110:in `_render_template'
  actionpack (3.2.16) lib/action_controller/metal/streaming.rb:225:in `_render_template'
  actionpack (3.2.16) lib/abstract_controller/rendering.rb:103:in `render_to_body'
  actionpack (3.2.16) lib/action_controller/metal/renderers.rb:28:in `render_to_body'
  actionpack (3.2.16) lib/action_controller/metal/compatibility.rb:50:in `render_to_body'
  actionpack (3.2.16) lib/abstract_controller/rendering.rb:88:in `render'
  actionpack (3.2.16) lib/action_controller/metal/rendering.rb:16:in `render'
  actionpack (3.2.16) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
  activesupport (3.2.16) lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
  /usr/local/rvm/rubies/ruby-2.0.0-p353/lib/ruby/2.0.0/benchmark.rb:296:in `realtime'

如您所见，单词preview是控制器操作的名称。

删除NewRelic没有帮助。然后错误被替换为：

NoMethodError (undefined method `formats' for "preview":String):

顺便说一句，Ruby版本为2.0.0-p353，Rails版本为3.2.16。Rails项目有一些自定义，比如大多数操作的OAuth参数，因为Rails应用程序主要是Node.JS项目的服务器存储单元。

查看API文档（如：http://www.rubydoc.info/docs/rails/3.1.1/ActionView/Template)给我留下的印象是determine_template Rails方法（在第二种情况下是一个未指定的方法，没有newrelic_rpm）不会返回ActionView::Template，而是返回String。你知道为什么会这样吗？

问题二：

调用rake cucumber实际上在大多数情况下都会产生这样的结果：

stack level too deep (SystemStackError)

以前的开发人员确实将其作为ActiveRecord::Base:的扩展

module ActiveRecord
  class Base
    include Documentable
    ...
    def self.has_url
      include Rails.application.routes.url_helpers
      self.default_url_options = Rails.application.default_url_options
      define_method :url do
        send "#{self.class.to_s.underscore}_url", self
      end
    end
  end
end

当然，这可能是原因。我已经尝试过用ActiveRecord::Concern方法替换那个（相当过时的）方法来扩展ActiveRecord，遗憾的是，这没有什么区别。我已经对这个项目进行了相当广泛的编译，这是其中唯一一个真正包含Rails模块的地方，所以现在应该是这个错误的唯一候选者，是吗？

对于这两个问题，我都不知所措。我在Rails方面有一定的经验（大约15个项目），从未遇到过这样的一年级问题。

感谢您的关注。任何想法都将不胜感激，即使我已经尝试过了。

更新#1：

根据请求，在ApplicationController中粘贴before_filter。

  def remove_oauth_params
    params.reject! {|k,_| %w[oauth_token bearer_token access_token].include? k}
  end
  def save_action
    @current_action = params[:action]
  end
  def set_access_header
    if request.path == "/users/sign_out"
      headers["Access-Control-Allow-Credentials"] = "true"
      headers["Access-Control-Allow-Headers"] = %w{Origin Accept Content-Type X-Requested-With X-CSRF-Token X-File-Name X-File-Size Cache-Control}.join(",")
      headers["Access-Control-Allow-Methods"] = "DELETE"
      headers["Access-Control-Allow-Origin"] = "http://#{Settings.app_domain}"
    else
      headers["Access-Control-Allow-Origin"]  = "*"
      headers["Access-Control-Allow-Methods"] = %w{GET POST PUT DELETE PATCH}.join(",")
      headers["Access-Control-Allow-Headers"] = %w{Origin Accept Content-Type X-Requested-With X-CSRF-Token X-File-Name X-File-Size Cache-Control}.join(",")
    end
    head(:ok) if request.request_method == "OPTIONS"
  end
  def set_limit_and_offset
    @limit = params.delete(:limit).to_i
    @limit = default_limit unless (1..default_limit).include?(@limit)
    @offset = params.delete(:offset).to_i
    @offset = 0 unless @offset > 0
  end

至于InvoiceController，相当基本：

class InvoicesController < ApplicationController
  oauthenticate :interactive => false
  layout "invoice"
  def preview
    @i = Invoice.find(params[:id])
    @origin = params[:origin]
  end
end

更新#2：

$ rake cucumber --trace
** Invoke cucumber (first_time)
** Invoke cucumber:ok (first_time)
** Invoke db:test:prepare (first_time)
** Invoke db:abort_if_pending_migrations (first_time)
** Invoke environment (first_time)
** Execute environment
[deprecated] I18n.enforce_available_locales will default to true in the future. If you really want to skip validation of your locale you can set I18n.enforce_available_locales = false to avoid this message.
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:abort_if_pending_migrations
** Execute db:test:prepare
** Invoke db:test:load (first_time)
** Invoke db:test:purge (first_time)
** Invoke environment 
** Invoke db:load_config 
** Execute db:test:purge
** Invoke environment 
** Execute db:test:load
** Invoke db:test:load_schema (first_time)
** Invoke db:test:purge 
** Execute db:test:load_schema
** Invoke db:schema:load (first_time)
** Invoke environment 
** Invoke db:load_config 
** Execute db:schema:load
** Invoke db:seed (first_time)
** Execute db:seed
** Invoke db:abort_if_pending_migrations 
building users for ce and ce-int brands
building example CE app owner
building CE beta app
** Execute cucumber:ok
/usr/local/rvm/rubies/ruby-2.0.0-p353/bin/ruby -S bundle exec cucumber  --profile default
Using the default profile...
[deprecated] I18n.enforce_available_locales will default to true in the future. If you really want to skip validation of your locale you can set I18n.enforce_available_locales = false to avoid this message.
Feature: Creation of robinson entries
  Create a robinson entry to prevent recipients from being mailed
  Background:                                                          # features/blocked_address/blocked_address_creation.feature:4
    Given there is the example customer with id 200                    # features/step_definitions/data_steps.rb:41
      stack level too deep (SystemStackError)
      features/blocked_address/blocked_address_creation.feature:5:in `Given there is the example customer with id 200'

Answer 1

编辑：有关解决方案，请参阅dimitkos注释

恐怕我没有简单的答案，但只有两个调试建议：

对于问题1:

• 包括Ruby调试器
• 在控制台中，调用app.get "/me/invoices/22/preview?oauth_token=XE03DFCGyCDYjdu8oWuU9zrN56Z6Wr7eZDuIjCbT&origin=http://localhost:9294"
• 一路往上爬，看看字符串是从哪里来的

至于2：你使用git进行源代码管理吗？

如果是，现在是试用git bisect的最佳时机。您可以找到一个rake cucumber仍然有效的旧提交，git可以帮助您在很短的步骤内找到破坏它的提交。更多信息：使用Git调试-二进制搜索