English 中文(简体)
铁路3.1 - 奇怪的Heroko错误
原标题:Rails 3.1 - Strange Heroku Error

我在赫洛库身上得到了以下信息 但不是本地的 似乎很奇怪,有什么想法吗?

2012-05-22T11:49:53+00:00 app[web.1]: ActionView::Template::Error (undefined method `<=>  for nil:NilClass):
2012-05-22T11:49:53+00:00 app[web.1]:     1: <h3>Product Tracklisting</h3>
2012-05-22T11:49:53+00:00 app[web.1]:     2: 
2012-05-22T11:49:53+00:00 app[web.1]:     3:    <ol id="track-list" data-update-url=<%= sort_producttracklistings_url %>>
2012-05-22T11:49:53+00:00 app[web.1]:     4:    <% @product.producttracklistings.sort_by { |producttracklisting| producttracklisting.position }.each  do |products_track| %>
2012-05-22T11:49:53+00:00 app[web.1]:     5:    
2012-05-22T11:49:53+00:00 app[web.1]:     6:    <%= content_tag_for :li, products_track do %>
2012-05-22T11:49:53+00:00 app[web.1]:     7: 
2012-05-22T11:49:53+00:00 app[web.1]:   app/views/products/_tracklisting.html.erb:4:in `_app_views_products__tracklisting_html_erb___857430611_70068520180420 
2012-05-22T11:49:53+00:00 app[web.1]:   app/views/products/show.html.erb:32:in `_app_views_products_show_html_erb___556626077_70068514945180 
2012-05-22T11:49:53+00:00 app[web.1]:   app/controllers/products_controller.rb:91:in `show 

我想这可能是因为 data- update-urllt;\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

最佳回答

来源于(第4行)。

每个 product production list 是否有 position position ?

问题回答

排在线里

<% @product.producttracklistings.sort_by { |producttracklisting| producttracklisting.position }.each  do |products_track| %>

由于某些 product productlation list , position nil 形式存在 position





相关问题
rails collection_select vs. select

collection_select and select Rails helpers: Which one should I use? I can t see a difference in both ways. Both helpers take a collection and generates options tags inside a select tag. Is there a ...

SSL slowness in EC2

We ve deployed our rails app to EC2. In our setup, we have two proxies on small instances behind round-robin DNS. These run nginx load balancers for a dynamically growing and shrinking farm of web ...

Auth-code with A-Za-z0-9 to use in an URL parameter

As part of a web application I need an auth-code to pass as a URL parameter. I am currently using (in Rails) : Digest::SHA1.hexdigest((object_id + rand(255)).to_s) Which provides long strings like : ...

RubyCAS-Client question: Rails

I ve installed RubyCAS-Client version 2.1.0 as a plugin within a rails app. It s working, but I d like to remove the ?ticket= in the url. Is this possible?

activerecord has_many :through find with one sql call

I have a these 3 models: class User < ActiveRecord::Base has_many :permissions, :dependent => :destroy has_many :roles, :through => :permissions end class Permission < ActiveRecord::...

Ordering a hash to xml: Rails

I m building an xml document from a hash. The xml attributes need to be in order. How can this be accomplished? hash.to_xml

Text Editor for Ruby-on-Rails

guys which text editor is good for Rubyonrails? i m using Windows and i was using E-Texteditor but its not free n its expired now can anyone plese tell me any free texteditor? n which one is best an ...

How to get SQL queries for each user where env is production

I’m developing an application dedicated to generate statistical reports, I would like that user after saving their stat report they save sql queries too. To do that I wrote the following module: ...