那些遇到过的问题

Rails中的XML Builder:"错误的参数数量"错误,我无法追踪

Pla*_*Ton 2 xml ruby-on-rails

铁路新手,我花了好几个小时试图寻找一个bug.任何帮助非常感谢.

我正在尝试创建一个rails页面,这样如果用户输入/ info/who_bought/1页面输出HTML,并且如果他们输入/info/who_bought/1.xml,页面将返回一个XML文件.(简而言之,我正在使用'带有Rails的敏捷Web开发'一书中的第11章)

HTML格式的输出工作正常,但如果我输入xml我一直得到'错误的参数数量(1为0)'错误页面.下载实际的电子书并直接复制/粘贴所有代码; 仍面临同样的问题.谷歌没有提到任何代码错误.

下面的代码和完整堆栈跟踪.如果有人有任何想法,我会非常感激.简而言之 - 什么可能导致xml.builder返回'1 for 0 arguments'错误？

非常感谢,行李

# app/controllers/info_controller.rb
class InfoController < ApplicationController
    def who_bought
        @product = Product.find(params[:id])
        @orders = @product.orders
        respond_to do |format|
            format.html
            format.xml {render :layout => false }
        end
    end

    protected
    def authorize
    end
end


# app/views/info/who_bought.xml.builder
xml.order_list(:for_product => @product.title) do
    for o in @orders
        xml.order do
            xml.name(o.name)
            xml.email(o.email)
        end
    end
end


# app/models/product.rb
class Product < ActiveRecord::Base
    has_many :orders, :through => :line_items
    has_many :line_items
    validates_presence_of :title, :description, :image_url
    validates_numericality_of :price
    validates_uniqueness_of :title
    validates_length_of :title,
                        :minimum => 10
    validates_format_of :image_url,
                        :with => %r{\.(gif|jpg|png)$}i,
                        :message => 'must be a URL for GIF, JPG ' +
                                'or PNG image.'
    validate :price_must_be_at_least_a_cent

    def price_must_be_at_least_a_cent
        errors.add(:price, 'should be at least 0.01') if price.nil? || price < 0.01
    end

    def self.find_products_for_sale
        find(:all, :order => "title")
    end

end

# config/routes.rb
ActionController::Routing::Routes.draw do |map|
  map.resources :users
  map.resources :line_items
  map.resources :orders
  map.resources :products
  map.connect ':controller/:action'
  map.connect ':controller/:action/:id'
  map.connect ':controller/:action/:id.:format'
end


# Full trace
/usr/lib/ruby/1.8/builder/xmlbase.rb:134:in `to_xs'
/usr/lib/ruby/1.8/builder/xmlbase.rb:134:in `_escape'
/usr/lib/ruby/1.8/builder/xmlbase.rb:87:in `text!'
/usr/lib/ruby/1.8/builder/xmlbase.rb:144:in `_newline'
/usr/lib/ruby/1.8/builder/xmlbase.rb:60:in `method_missing'
app/views/info/who_bought.xml.builder:2
vendor/rails/activerecord/lib/active_record/associations/association_collection.rb:359:in `method_missing'
vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:212:in `method_missing'
vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:212:in `each'
vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:212:in `send'
vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:212:in `method_missing'
vendor/rails/activerecord/lib/active_record/associations/association_collection.rb:359:in `method_missing'
app/views/info/who_bought.xml.builder:1
vendor/rails/actionpack/lib/action_view/renderable.rb:39:in `send'
vendor/rails/actionpack/lib/action_view/renderable.rb:39:in `render'
vendor/rails/actionpack/lib/action_view/template.rb:73:in `render_template'
vendor/rails/actionpack/lib/action_view/base.rb:256:in `render'
vendor/rails/actionpack/lib/action_controller/base.rb:1177:in `render_for_file'
vendor/rails/actionpack/lib/action_controller/base.rb:940:in `render_without_benchmark'
vendor/rails/actionpack/lib/action_controller/benchmarking.rb:51:in `render'
vendor/rails/activesupport/lib/active_support/core_ext/benchmark.rb:8:in `realtime'
vendor/rails/actionpack/lib/action_controller/benchmarking.rb:51:in `render'
app/controllers/info_controller.rb:6
vendor/rails/actionpack/lib/action_controller/mime_responds.rb:135:in `call'
vendor/rails/actionpack/lib/action_controller/mime_responds.rb:135
vendor/rails/actionpack/lib/action_controller/mime_responds.rb:164:in `call'
vendor/rails/actionpack/lib/action_controller/mime_responds.rb:164:in `respond'
vendor/rails/actionpack/lib/action_controller/mime_responds.rb:158:in `each'
vendor/rails/actionpack/lib/action_controller/mime_responds.rb:158:in `respond'
vendor/rails/actionpack/lib/action_controller/mime_responds.rb:107:in `respond_to'
app/controllers/info_controller.rb:5:in `who_bought'
vendor/rails/actionpack/lib/action_controller/base.rb:1256:in `send'
vendor/rails/actionpack/lib/action_controller/base.rb:1256:in `perform_action_without_filters'
vendor/rails/actionpack/lib/action_controller/filters.rb:617:in `call_filters'
vendor/rails/actionpack/lib/action_controller/filters.rb:610:in `perform_action_without_benchmark'
vendor/rails/actionpack/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
vendor/rails/actionpack/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
vendor/rails/actionpack/lib/action_controller/rescue.rb:136:in `perform_action_without_caching'
vendor/rails/actionpack/lib/action_controller/caching/sql_cache.rb:13:in `perform_action'
vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
vendor/rails/activerecord/lib/active_record/query_cache.rb:8:in `cache'
vendor/rails/actionpack/lib/action_controller/caching/sql_cache.rb:12:in `perform_action'
vendor/rails/actionpack/lib/action_controller/base.rb:524:in `send'
vendor/rails/actionpack/lib/action_controller/base.rb:524:in `process_without_filters'
vendor/rails/actionpack/lib/action_controller/filters.rb:606:in `process_without_session_management_support'
vendor/rails/actionpack/lib/action_controller/session_management.rb:134:in `process'
vendor/rails/actionpack/lib/action_controller/base.rb:392:in `process'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:184:in `handle_request'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:112:in `dispatch_unlocked'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:125:in `dispatch'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:124:in `synchronize'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:124:in `dispatch'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:134:in `dispatch_cgi'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:41:in `dispatch'
/usr/lib/ruby/1.8/mongrel/rails.rb:76:in `process'
/usr/lib/ruby/1.8/mongrel/rails.rb:74:in `synchronize'
/usr/lib/ruby/1.8/mongrel/rails.rb:74:in `process'
/usr/lib/ruby/1.8/mongrel.rb:159:in `process_client'
/usr/lib/ruby/1.8/mongrel.rb:158:in `each'
/usr/lib/ruby/1.8/mongrel.rb:158:in `process_client'
/usr/lib/ruby/1.8/mongrel.rb:285:in `run'
/usr/lib/ruby/1.8/mongrel.rb:285:in `initialize'
/usr/lib/ruby/1.8/mongrel.rb:285:in `new'
/usr/lib/ruby/1.8/mongrel.rb:285:in `run'
/usr/lib/ruby/1.8/mongrel.rb:268:in `initialize'
/usr/lib/ruby/1.8/mongrel.rb:268:in `new'
/usr/lib/ruby/1.8/mongrel.rb:268:in `run'
/usr/lib/ruby/1.8/mongrel/configurator.rb:282:in `run'
/usr/lib/ruby/1.8/mongrel/configurator.rb:281:in `each'
/usr/lib/ruby/1.8/mongrel/configurator.rb:281:in `run'
/usr/bin/mongrel_rails:129:in `run'
/usr/lib/ruby/1.8/mongrel/command.rb:212:in `run'
/usr/bin/mongrel_rails:282
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Joh*_*ohn 5

这是Rails 3.1,Builder 3.0与fast_xs gem或hpricot(捆绑fast_xs)之间的冲突.有些人无法重现它的原因是他们的Gemfile中没有fast_xs或hpricot.

不幸的是,由于这是一场三方冲突,所以每个人都认为这是另一个图书馆的错:

在此期间,在堆上堆叠另一个猴子补丁并添加config/initializers/unbreak_string_to_xs.rb以下内容:

class String
  def fast_xs_absorb_args(*args); fast_xs; end
  alias_method :to_xs, :fast_xs_absorb_args
end
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(从这个回答到重复.)

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