Ruby-on-rails 渲染部分 :collection => @array 指定变量名
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Render partial :collection => @array specify variable name
提问by botbot
I am rendering a partial like this:
我正在渲染这样的部分：
$("#box_container").html("<%= escape_javascript( render :partial => 'contacts/contact_tile', :collection => @contacts) %>")
Problem is that my partial is expecting the variable 'contact'.
问题是我的部分期望变量“联系”。
ActionView::Template::Error (undefined local variable or method `contact'
I simply want to tell the partial to expect a variable contact. Should iterate through @contactsas contact. How do I do that?
我只是想告诉部分期待一个变量contact。应该遍历@contactsas contact。我怎么做？
回答by botbot
Found this is also helpful from the docs. You aren't limited to having the variable named after the partial:
从文档中发现这也很有帮助。您不仅限于以部分命名的变量：
http://guides.rubyonrails.org/layouts_and_rendering.html
http://guides.rubyonrails.org/layouts_and_rendering.html
To use a custom local variable name within the partial, specify the :as option in the call to the partial:
要在部分中使用自定义局部变量名称，请在对部分的调用中指定 :as 选项：
<%= render :partial => "product", :collection => @products, :as => :item %>
With this change, you can access an instance of the @products collection as the item local variable within the partial."
通过此更改，您可以访问 @products 集合的实例作为部分中的项目局部变量。”
回答by matthew.tuck
The documentation at http://guides.rubyonrails.org/layouts_and_rendering.htmlsays:
http://guides.rubyonrails.org/layouts_and_rendering.html 上的文档说：
When a partial is called with a pluralized collection, then the individual instances of the partial have access to the member of the collection being rendered via a variable named after the partial.
当使用复数集合调用局部时，局部的各个实例可以通过以局部命名的变量访问正在呈现的集合成员。
So it will be passed a variable called "contact_tile" instead of "contact". Perhaps you can just rename your partial.
所以它将传递一个名为“contact_tile”而不是“contact”的变量。也许你可以重命名你的部分。
If this naming is important, you could do it explicitly without the collection option by something like:
如果此命名很重要，您可以通过以下方式在不使用集合选项的情况下显式执行此操作：
@contacts.each { |contact| render :partial => 'contacts/contact_tile', :locals => {:contact => contact } }
(although as a commenter pointed out, this may not be as performant)
（尽管正如评论者指出的那样，这可能没有那么高效）
回答by Manish Shrivastava
Latest syntax are :
最新的语法是：
index.html.erb
index.html.erb
<%= render partial: "product", collection: @products %>
_product.html.erb
_product.html.erb
<p>Product Name: <%= product.name %></p>
@productsis used in partial as product
@products部分用作 product
Where @products can be considered as Product.alland productcan be considered as a row of product i.e. Product.firstas looped all product one by one.
其中@products 可以被视为Product.all并且product可以被视为一行产品，即Product.first一个一个循环的所有产品。
