欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  php教程

rails render partial 参数 变量说明

程序员文章站 2022-05-07 11:11:07
...
1. 默认参数

Ruby代码

<%= render :partial => "account" %>


默认本地有个变量@account, 传递过去,render到的partial(_account.erb)有个变量account

2. 单独参数 locals
locals传递一组hash参数hash 值是本地的变量,hash的key是partial里的变量

Ruby代码

<%= render :partial => "account", :locals => { :account => @buyer } %>  
  
<% for ad in @advertisements %>  
  <%= render :partial => "ad", :locals => { :ad => ad } %>  
<% end %>


上面两个render分别
传递本地变量@buyer到_account.erb里叫account的参数
传递本地变量ad到_ad.erb里叫ad

3

根据1默认参数下面两个是一样的

Ruby代码

<%= render :partial => "contract", :locals => { :contract  => @contract } %>  
  
<%= render :partial => "contract" %>




4. as使用

用来改变传递之后,partial里变量的名称,如下,render方式是一样的。

Ruby代码

<%= render :partial => "contract", :as => :agreement  
  
<%= render :partial => "contract", :locals => { :agreement => @contract }


传递@contract到_contract.erb里,partial里的变量名为agreement

5. object使用

object最简单,就是把一个变量原名传递到partial里,
所以什么都记不清楚的时候,就用object多写点都能表达

如下:

Ruby代码

<%= render :partial => "account", :object => @buyer %>  
  
<% for ad in @advertisements %>  
  <%= render :partial => "ad", :object => ad %>  
<% end %>


传递@buyer到_account.erb的partial里变量名还是@buyer
传递ad到_ad.erb的partial里变量名还是ad

6 object和as合用

Ruby代码

<%= render :partial => "contract", :object => @contract, :as => :contract %>  
  
<%= render :partial => "contract" %>



7 collection

Ruby代码

<%= render :partial => "ad", :collection => @advertisements %>



@advertisements是一个array,partial里_ad.erb有个ad变量是@advertisements的成员。就是_ad.erb不用写loop只是一条广告显示。

Ruby代码

<%= render :partial => "ad", :collection => @advertisements, :spacer_template => "ad_divider" %>


同上,循环显示_ad.erb _ad_divider.erb 显示@advertisements.size次其中partial_ad_counter是默认计数器表示第几条广告

8 默认

看你要partial的变量是一组记录还是一条记录,会对应约定用locals和collection

Ruby代码

#@account是一条记录  
# <%= render :partial => "accounts/account", :locals => { :account => @account} %>  
<%= render :partial => @account %>  
  
# @posts是一组记录  
# <%= render :partial => "posts/post", :collection => @posts %>  
<%= render :partial => @posts %>


这是很人性的约定,可有时候就是忘了

9 一些漂亮的简写

Ruby代码

#<%= render :partial => "account" %>可用下面代替  
<%= render "account" %>  
  
#<%= render :partial => "account", :locals => { :account => @buyer } %>可用下面代替  
<%= render "account", :account => @buyer %>  
  
# @account是一条记录  
# <%= render :partial => "accounts/account", :locals => { :account => @account } %>可用下面代替  
<%= render(@account) %>  
  
# @posts是一组记录  
# <%= render :partial => "posts/post", :collection => @posts %>可用下面代替  
<%= render(@posts) %>



10 layout

Ruby代码

<%# app/views/users/index.html.erb &>  
Here's the administrator:  
<%= render :partial => "user", :layout => "administrator", :locals => { :user => administrator } %>  
  
Here's the editor:  
<%= render :partial => "user", :layout => "editor", :locals => { :user => editor } %>  
  
<%# app/views/users/_user.html.erb &>  
Name: <%= user.name %>  
  
<%# app/views/users/_administrator.html.erb &>  
<div id="administrator">  
  Budget: $<%= user.budget %>  
  <%= yield %>  
</div>  
  
<%# app/views/users/_editor.html.erb &>  
<div id="editor">  
  Deadline: <%= user.deadline %>  
  <%= yield %>  
</div>