Rails 3，将局部变量传递给partial [英] Rails 3, passing local variable to partial

问题描述

可能重复:
Rails:对于将本地人传递给局部人的语法感到困惑

Possible Duplicate:
Rails: confused about syntax for passing locals to partials

我想将局部变量(在模型中没有相关字段)传递给局部变量.

I want to pass local variable(which doesn't have relevant field in model) to partial.

# infos/index.html.erb

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

:img_style将是图像的html样式.

:img_style will be html style for image.

# 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

但是它不起作用，它返回错误:

But it does not work, it returns error:

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

可以做到而不必制作多余的局部片段吗?

It can be done without making redundant partials?

对不起，我的英语. :P

Sorry for my English. :P

好的模型信息没有:img_style字段

Well model Info don't have :img_style field

# 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

甚至很简单

<%= img_style %>

不起作用.

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'

观看次数

# 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>

最后

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?

推荐答案

我实际上只是在Rails 3中使用这种语法:

I actually just use this syntax in Rails 3:

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

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