rails render partial 参数 变量说明
这里的conventions总是容易记不清楚 就是locals collection object1. 默认参数
<%= 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
<%= 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
<%= 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。
<%= 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：
<%= 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
<%= render :partial => "contract", :object => @contract, :as => :contract %><%= render :partial => "contract" %>
7 collection
<%= 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。
<%= 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
#@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
#<%= 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
<%# 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>
参考文档：
http://apidock.com/rails/ActionController/Base/render
http://johnnyhg.iteye.com/blog/499182
http://apidock.com/rails/ActionView/Helpers/UrlHelper/link_to
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