Rails 3，将局部变量传递给部分[重复]

可能的重复：
Rails：对将局部变量传递给局部变量的语法感到困惑 https://stackoverflow.com/questions/4402556/rails-confused-about-syntax-for-passing-locals-to-partials

我想将局部变量（模型中没有相关字段）传递给局部变量。

# infos/index.html.erb

<%= render :partial => 'info', :locals => {:info => first, :img_style => "original"} %> 

:img_style 将是图像的 html 样式。

# infos/_info.html.erb
<% first = @infos.shift %>
<%= image_tag(info.image.url, :class => img_style),  info %> 
# and here goes code for normal iteration
<% @infos.each do |e| %>
# etc

但它不起作用，它返回错误：

# GET /infos/
undefined local variable or method `img_style' for #<#<Class:0xc471f34>:0xc470cc4>

不做多余的部分就可以完成吗？

对不起我的英语不好。 ：P

EDIT:

模型信息没有 :img_style 字段

# db/schema.rb
  create_table "infos", :force => true do |t|
    t.string   "title"
    t.text     "description"
    t.integer  "place_id"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.string   "image_file_name"
    t.string   "image_content_type"
    t.integer  "image_file_size"
    t.datetime "image_updated_at"
    t.text     "short"
  end

EDIT2:

甚至简单

<%= img_style %>

不工作。

应用程序堆栈跟踪

app/views/infos/_info.html.erb:3:in `_app_views_infos__info_html_erb___1029249744_92158380_1472718'
app/views/infos/index.html.erb:7:in `_app_views_infos_index_html_erb__184644561_92172050_0'
app/controllers/infos_controller.rb:8:in `index'

EDIT3:

Views

# infos/index.html.erb
<div >
  <h1><%= t('info.infos') %></h1>
  <div id="left">
    <% first = @infos.shift %>
    <div>
      <% @aimg_style = "original"%>
      <%= render 'info', :locals => {@img_style => @aimg_style } %>
    </div>
    <ul>
      <% @infos.each do |e| %>
        <li>
          <div>
            <%= render :partial => 'info', :object => e %>
          </div>
        </li>
      <% end %>
    </ul>
    <%= will_paginate @infos %>

# infos/_info.html.erb
<%#= link_to thumbnail(info, "listTabsImg", false, img_style), info %>
  <%#= image_tag(info.image.url()) %>
  <%= img_style %>
<p>
  <strong class="nameBox"><%= link_to info.title, info %></strong>
  <span><%= info.short %>...</span>
  <%= link_to "#{t('more')} »", info %>
</p>

FINALLY

这不起作用：

# infos/index.html.erb
<% first = @infos.shift %>
<div class="boxEvent">
  <% @aimg_style = "original"%>
  <%= first %>
  <%= render 'info', :locals => {:info => first, :img_style => @aimg_style } %>
</div>

这有效：

# infos/index.html.erb
  <% @infos.each do |e| %>
    <li>
      <div class="boxEvent">
        <%= render :partial => 'info', :locals => {:info => e, :img_style => "original"} %>
      </div>
    </li>
  <% end %>

有人知道为什么吗？

实际上我只是在 Rails 3 中使用这个语法：

render "a_partial", :a_local_variable => whatever, :another_variable => another