局部渲染

Question

我在我的应用程序上使用了数百次带有局部渲染的渲染，但我遇到了一个问题，我不明白为什么。

我正在递归调用部分。

#index.html.slim
= render partial: 'medias/special_content', locals: {shops: @shops, shop: @shop}

#medias/_special_content.html.slim
= render partial: 'medias/more_specific', locals: {shops: shops, shop: shop}

#medias/_more_specific.html.slim
- if shops.nil?
  #Some code

这是我的错误：

undefined local variable or method `shops' for #<#

<Class:0x0000000775c360>:0x007f027cff5c28>
    app/views/medias/_more_specific.html.slim:130:in
    `_app_views_medias__more_specific_html_slim___1518734296928926472_69824330512820' 
actionpack (3.2.17) lib/action_view/template.rb:145:in `block in render' 
activesupport (3.2.17) lib/active_support/notifications.rb:125:in `instrument' 
actionpack (3.2.17) lib/action_view/template.rb:143:in `render' 
actionpack (3.2.17) lib/action_view/renderer/partial_renderer.rb:265:in `render_partial' 
actionpack (3.2.17) lib/action_view/renderer/partial_renderer.rb:238:in `block in render' 
actionpack (3.2.17) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument' 
activesupport (3.2.17) lib/active_support/notifications.rb:123:in `block in instrument' 
activesupport (3.2.17) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (3.2.17) lib/active_support/notifications.rb:123:in `instrument' 
actionpack (3.2.17) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument' 
actionpack (3.2.17) lib/action_view/renderer/partial_renderer.rb:237:in `render' 
actionpack (3.2.17) lib/action_view/renderer/renderer.rb:41:in `render_partial' 
actionpack (3.2.17) lib/action_view/renderer/renderer.rb:15:in `render' 
actionpack (3.2.17) lib/action_view/helpers/rendering_helper.rb:24:in `render' 
app/views/medias/_special_content.html.slim:20:in 
...

Answer 1

如果它与错误源自的部分相同，那么看起来您正在从其他地方渲染more_specific 部分（即不是来自special_content 文件）并且没有通过@987654323 传递所需的变量@。因为否则，我认为这个错误是不可能的。

您也可以尝试简单的render 语法，如下所示：

render path_to_parent_partial, shops: @shops, shop: @shop # in index
render path_to_child_partial, shops: shops, shop: shop # in parent

但首先，在您的项目中搜索 'more_specific' 并查看您没有传递 shops 变量的位置。您还可以检查 Rails Server 日志输出以查看正在呈现哪些视图文件。

Answer 2

您可以在#medias/_more_specific.html.slim 中直接调用@shops，因为它是实例变量，因此在这里也可以使用。

• 如果@shops.blank？