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rails render partial 参数 变量说明

热度:61   发布时间:2023-12-09 08:34:43.0

这里的conventions总是容易记不清楚 就是locals collection object 
1. 默认参数 

Ruby代码

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

<%= 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" %> 

<%= 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 } 

<%= 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 %> 

<%= 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" %> 

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

<%= render :partial => "contract" %> 


7 collection 

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

<%= 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" %> 

<%= 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 %> 

#@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) %> 

#<%= 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 &> 

Budget: $<%= user.budget %> 
<%= yield %> 


<%# app/views/users/_editor.html.erb &> 

Deadline: <%= user.deadline %> 
<%= yield %> 


<%# 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 &>

Budget: $<%= user.budget %>
<%= yield %>


<%# app/views/users/_editor.html.erb &>

Deadline: <%= user.deadline %>
<%= yield %>
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