Rails 渲染中的 :locals 是什么？
这是渲染的 API 定义：
render(options = {}, locals = {}, &block)
Returns the result of a render that’s dictated by the options hash. The primary options are:
:partial - See ActionView::Partials.
:file - Renders an explicit template file (this used to be the old default), add :locals to pass in those.
:inline - Renders an inline template similar to how it’s done in the controller.
:text - Renders the text passed in out.
这里没有解释 locals 的目的是什么？当地人有什么用？
Here is the API definition for render:
render(options = {}, locals = {}, &block)
Returns the result of a render that’s dictated by the options hash. The primary options are:
:partial - See ActionView::Partials.
:file - Renders an explicit template file (this used to be the old default), add :locals to pass in those.
:inline - Renders an inline template similar to how it’s done in the controller.
:text - Renders the text passed in out.
There is no explanation about what's the purpose of locals here? What's locals for?
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将局部变量传递给部分模板，而不是控制器实例变量。
请参阅布局和渲染指南中的第 3.4.4 节“传递局部变量”。
To pass local variables to the partial template, as opposed to controller instance variables.
See Section 3.4.4, Passing Local Variables in the Layouts and Rendering Guide.
例如：
<%= render :partial => “帐户”%>这意味着该部分已经有一个名为
@account的实例变量，并且您将其传递给该部分。<%= 渲染：部分 => “帐户”，：locals => {：帐户=> @buyer } %>这意味着您将一个名为
@buyer的本地实例变量传递给account部分，并且account部分中的变量称为@帐户。即，哈希{ :account =>; @buyer }for:locals仅用于将局部变量传递给局部变量。您还可以以相同的方式使用关键字as：<%= 渲染：部分 => “合同”，：as => ：协议这与：
相同
<%= 渲染：部分 => "合同", :locals => {：协议=> @contract }For example:
<%= render :partial => "account" %>This means there is already an instance variable called
@accountfor the partial and you pass it to the partial.<%= render :partial => "account", :locals => { :account => @buyer } %>This means you pass a local instance variable called
@buyerto theaccountpartial and the variable in theaccountpartial is called@account. I.e., the hash{ :account => @buyer }for:localsis just used for passing the local variable to the partial. You can also use the keywordasin the same way:<%= render :partial => "contract", :as => :agreementwhich is the same as:
<%= render :partial => "contract", :locals => { :agreement => @contract }