rails render partial parameter variable description

1. Default parameters

Ruby code

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

By default, there is a local variable @account, which is passed to the partial (_account.erb) rendered to has a variable account

2. Separate parameters locals
locals is passed The hash value of the group hash parameter is a local variable, and the hash key is a variable in the partial

Ruby code

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

The two renders above are
pass the local variable @buyer to the parameter called account in _account.erb
Pass the local variable ad to _ad.erb and call it ad

3

According to 1 default parameter, the following two are the same

Ruby code

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

4. as use

to change after passing , the name of the variable in the partial is as follows, and the rendering method is the same.

Ruby code

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

Pass @contract to _contract.erb, the variable in partial is called agreement

5. The easiest way to use object

object is to pass the original name of a variable to partial,
So when you can’t remember anything clearly, just use object and write more to express it

as follows:

Ruby code

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

Pass @buyer to the variable name in the partial of _account.erb or @buyer
Pass ad The variable name in the partial of _ad.erb is still ad

6 object and as are combined

Ruby code

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

7 collection

Ruby code

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

@advertisements is an array, partial There is an ad variable in _ad.erb which is a member of @advertisements. That is, _ad.erb does not need to write loop, it is just an advertisement display.

Ruby code

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

Same as above, loop to display _ad.erb _ad_divider.erb to display @advertisements.size times where partial_ad_counter is the default counter indicating which advertisement

8 default

depends on the variable you want to be partial. A group of records is still a record, and locals and collections will be used according to the agreement

Ruby code

#@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 %>

This is a very human agreement, but sometimes we just forget

9 some beautiful abbreviations

Ruby code

#<%= 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 code

<%# app/views/users/index.html.erb &>  
Here&#39;s the administrator:  
<%= render :partial => "user", :layout => "administrator", :locals => { :user => administrator } %>  
  
Here&#39;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>