rails render partial 参数 变量说明
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>
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