ActiveAdmin-如何从局部访问实例变量？ [英] ActiveAdmin -- How to access instance variables from partials?

问题描述

我似乎无法局部访问实例对象。示例：

I can't seem to access instance objects in partials. Example:

在控制器中，我有：

ActiveAdmin.register Store do
  sidebar "Aliases", :only => :edit do
    @aliases = Alias.where("store_id = ?", params[:id])
    render :partial => "store_aliases"
  end
end

然后在_store_aliases.html.erb中部分我有：

Then in the _store_aliases.html.erb partial I have:

<% @aliases.each do |alias| %>
  <li><%= alias.name %></li>
<% end %>

这不起作用。唯一有效的方法（在我将逻辑放在视图中时，这样做是很恐怖的：

This doesn't work. The only thing that does work (which is horrible to do as I'm putting logic in a view is this:

  <% @aliases = Alias.where("store_id = ?", params[:id]) %> 
  <% @aliases.each do |alias| %>
     <li><%= alias.name %></li>
  <% end %>

推荐答案

渲染部分时，您需要主动定义提供给该部分的变量。更改行

When rendering a partial you need to actively define the variables that are given to that partial. Change your line

render :partial => "store_aliases"

至

render :partial => "store_aliases", :locals => {:aliases => @aliases }

在您的部分变量中，然后可以作为局部变量（而不是实例变量）访问变量。通过删除 @ 。

Inside your partial the variables is then accessible as a local variable (not an instance variable!). You need to adjust your logic inside the partial by removing the @.

<% aliases.each do |alias| %>
  <li><%= alias.name %></li>
<% end %>

要进一步阅读，请参阅 API文档（特别是 3.3.4传递局部变量部分）。

For further reading have a look at the API documentation (specifically the section "3.3.4 Passing Local Variables").

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