Ruby-on-rails 渲染部分 :object 与 :locals
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render partial :object vs :locals
提问by Chris Muench
<%= render :partial => 'partial/path', :locals => {:xyz => 'abc'} %>
vs
对比
<%= render :partial => 'partial/path', :object => @some_object %>
I think the first one make a local variable named xyzavailable in the partial and the second one makes a local variable named objectavailable in the partial. So what is the difference? (Besides localsallows more than one variable)
我认为第一个使名为局部变量的局部变量xyz在部分中可用，第二个使名为局部变量的局部变量object在局部中可用。那么区别是什么呢？（除了locals允许多个变量）
采纳答案by Wizard of Ogz
In the second case using :object will define a variable with the same name as the partial by default. If my partial template is named _user.html.erb then there will be a local variable named "user" defined in the template.
在第二种情况下，使用 :object 将默认定义一个与部分名称相同的变量。如果我的部分模板名为 _user.html.erb，那么模板中将定义一个名为“user”的局部变量。
You can specify a different variable name with :as => "another_name".
您可以使用 :as => "another_name" 指定不同的变量名称。
This is documented here: http://api.rubyonrails.org/classes/ActionView/PartialRenderer.html, here: http://apidock.com/rails/ActionView/PartialRenderer
此处记录：http: //api.rubyonrails.org/classes/ActionView/PartialRenderer.html，此处：http: //apidock.com/rails/ActionView/PartialRenderer
...and for older Rails (version <= v3.09): http://apidock.com/rails/ActionView/Partials
...对于较旧的 Rails（版本 <= v3.09）：http://apidock.com/rails/ActionView/Partials
回答by nathanvda
The second form
第二种形式
render :partial => 'account', :object => @some_account
will make sure the accountvariable in the partial will be set to @some_account.
You can rename the variable using the :asoption.
将确保account部分中的变量将设置为@some_account. 您可以使用该:as选项重命名变量。
The biggest advantage of the :localsis that
最大的优点:locals就是
- you have very clear control over the objects and names
- you can assign more than 1 variable
- 您可以非常清楚地控制对象和名称
- 您可以分配 1 个以上的变量
So you could do something like
所以你可以做类似的事情
render partial => 'some_view', :locals => { :user => account.user, :details => some_details_we_retrieved }
making a clear seperation possible when needed.
在需要时进行明确的分离。
The disadvantage of the :localsapproach is that it is more verbose, and sometimes a simple
这种:locals方法的缺点是比较冗长，有时也很简单
render :partial => 'account'
is identical to
等同于
render :partial => 'account', :locals => {:account => @account }
So use the one which suits you the best (or where it suits the best).
因此，请使用最适合您的（或最适合您的）。
回答by Ryan
If you're using Rails 3+, there's an even easier syntax to use:
如果您使用的是 Rails 3+，则可以使用更简单的语法：
# Instead of <%= render partial: "account", locals: { account: @buyer } %>
<%= render 'account', account: @buyer %>
Source: Action View Partials
