<% events_array.each_with_index do |event,index| %>
<%= render partial: "events/activities/#{event.action}",locals: {event: event,index: index} %>
<section class="card-overlay valign-wrapper">
<div class="valign col s12 m6 l4 card-container">
<%= render partial: 'nodes/node',locals: {node: event.eventable.node,node_counter: index} %>
</div>
</section>
<% end %>
这称为节点/节点部分(为了简洁而被截短)：
<div class="col s12 m6 l4 card-container">
<div class="card" id="card-<%= node_counter %>">
<!-- Card Content -->
<div class="card-content" style="background-image: url('<%= node.media.try(:thumbnail_url) %>');">
我现在得到这个错误：
undefined local variable or method `node_counter' for #<#<Class:0x007f9067394f50>:0x007f9063b7d8b0>
在这一行：
<div class="card" id="card-<%= node_counter %>">
为什么我的渲染部分的本地选项：…不关心这个？
请注意,其他部分渲染的以前的本地声明工作正常,没有错误,因此不知道为什么这不起作用.
编辑1
这是在app / views / nodes / _node.html.erb中找到的完整部分
<div class="col s12 m6 l4 card-container">
<div class="card" id="card-<%#= node_counter %>">
<!-- Card Content -->
<div class="card-content" style="background-image: url('<%= node.media.try(:thumbnail_url) %>');">
<video id="video_<%= node_counter %>" class="card-video video-js vjs-default-skin" controls preload="none" data-setup="{}">
<source src="<%= node.media.try(:zc_mp4_url) %>" type='video/mp4' />
<p class="vjs-no-js">To view this video please enable JavaScript,and consider upgrading to a web browser that <a href="http://videojs.com/html5-video-support/" target="_blank">supports HTML5 video</a></p>
</video>
<a class="video-close"><i class="icon-close"></i></a>
<div class="card-attr">
<!-- Favorites -->
<%= show_favorites_button(node,node_counter) %>
<%= favorites_count(node) %>
<!-- Comments -->
<%= comments_count(node) %>
</div>
<!-- Tagged Users -->
<div class="card-tagged-users">
<%= render partial: "nodes/tagged_user",collection: node.tagged_users %>
<span class="tagged-count"><%= node.cached_num_user_tags %></span>
</div>
<h3 class="card-title"><%= node.name %></h3>
</div>
<!-- End Tagged Users -->
<!-- Card Meta -->
<div class="card-Meta">
<aside>
<%= image_tag node.user.avatar.url,class: "card-author-avatar",alt: "" %>
</aside>
<section>
<h6 class="card-author-name"><%= node.user.name %></h6>
<time class="card-date"><%= node.created_at.strftime("%B %d,%Y") %></time>
<p class="card-desc"><%= node.media.description %>
</section>
</div>
<!-- End Card Meta -->
<!-- Card Comments -->
<div class="card-comments-container">
<h4 class="card-comments-title"><%= pluralize(node.comments_count,"Comment") %></h4>
<a class="card-comments-expand"><i class="icon-arrow-down"></i></a>
<div class="card-comments">
<%= render partial: "nodes/comment",collection: node.comments.includes(:user).order(created_at: :desc) %>
</div>
</div>
<!-- End Card Comments -->
<!-- Card Input -->
<div class="card-input">
<%= simple_form_for([node,Comment.new],html: { id: "new_comment_card-#{node_counter}"},remote: true) do |f| %>
<%= f.error_notification %>
<%= f.input_field :message,as: :text,id: "card-input-field-card-#{node_counter}",class: "input-field",placeholder: "Share your thoughts",cols: "30",rows: "10","data-behavior" => "submit_on_enter" %>
<%= f.button :submit,"Submit",name: "card_id",value: "card-#{node_counter}",id: "submit-card-#{node_counter}",class: "comment-submit",data: { disable_with: "Submitting Comment..." } %>
<% end %>
</div>
<!-- End Card Input -->
<!-- End Card Content -->
</div>
</div>
编辑2
所以,在更好的错误里面,在我称之为部分的视图范围内的REPL,即这个问题中的第一个代码片段,我在控制台上玩过,看到第二个部分的局部变量不是尽管他们的价值观返回合法价值：
>> node !! #<NameError: undefined local variable or method `node' for #<#<Class:0x007fbf389e01c0>:0x007fbf30cd3358>> >> event.eventable.node => #<Node id: 3,name: "Outro",family_tree_id: 1,user_id: 1,media_id: 3,media_type: "Video",created_at: "2015-07-25 04:28:39",updated_at: "2015-08-01 23:11:26",Circa: nil,is_comment: nil,cached_Votes_total: 0,cached_Votes_score: 0,cached_Votes_up: 0> >> node_counter !! #<NameError: undefined local variable or method `node_counter' for #<#<Class:0x007fbf389e01c0>:0x007fbf30cd3358>> >> index => 0 >>
为什么这项任务不会发生？
解决方法
<％= render partial：'nodes / node',object：event.eventable.node,locals：{new_node_counter：index}％>
我相信你将需要为node_counter使用不同的变量名.如果您需要使用node_counter变量,因为其他页面使用此部分,您可以随时在部分“nodes / node”的顶部执行以下操作：
<％node_counter = node_counter || new_node_counter％>
以下是http://guides.rubyonrails.org/layouts_and_rendering.html的相关摘录：
Every partial also has a local variable with the same name as the partial (minus the underscore). You can pass an object in to this local variable via the :object option:
<%= render partial: "customer",object: @new_customer %>…
Rails also makes a counter variable available within a partial called by the collection,named after the member of the collection followed by _counter. For example,if you’re rendering @products,within the partial you can refer to product_counter to tell you how many times the partial has been rendered. This does not work in conjunction with the as: :value option.
原文地址：https://www.jb51.cc/ruby/271594.html
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