鉴于这些关系:
class Account < ActiveRecord::Base
has_many :employments
has_many :people, :through => :employments
accepts_nested_attributes_for :employments
end
class Employment < ActiveRecord::Base
belongs_to :account
belongs_To :person
end
我正在尝试列出一个帐户的就业记录:
<% form_for @account do |f| -%>
<% f.fields_for :employments do |e| -%>
<%= render :partial => 'employment', :collection => @account.employments, :locals => { :f => e } %>
<% end -%>
<% end -%>
我已经验证了 @account 中的就业表包含两条记录,但我得到了部分的四个副本,因为它重复了两次就业:
Employment Load (1.0ms) SELECT * FROM [employments] WHERE ([employments].account_id = 1)
Person Load (1.3ms) SELECT * FROM [people] WHERE ([people].[id] = 2)
Rendered accounts/_employment (17.9ms)
Person Load (1.5ms) SELECT * FROM [people] WHERE ([people].[id] = 1)
Rendered accounts/_employment (5.1ms)
Rendered accounts/_employment (2.2ms)
Rendered accounts/_employment (2.1ms)
谁能解释为什么会发生这种情况?
以下是一些附加信息:
_employment.html.erb
部分:
<div class="employment">
<span class="name"><%= link_to h(employment.person.name), person_path(employment.person) %></span>
<span class="role"><%=h employment.role %></span>
<span class="commands"><%= remove_child_link "Remove", f %></span>
</div>
remove_child_link
是我唯一需要生成表单域的地方。它为记录创建_delete
字段并连接一个将值更改为“1”的删除链接。不过,“角色”属性也可以是可编辑的。重要的是我不希望所有字段都是可编辑的。
此视图的accounts_controller
操作:
def edit
@account = Account.find(params[:id])
end
def update
@account = Account.find(params[:id])
respond_to do |format|
if @account.update_attributes(params[:account])
flash[:notice] = "#{@account.business_name} was successfully updated."
format.html { redirect_to @account }
else
format.html { render :action => "edit" }
end
end
end
本让我朝着正确的方向前进。一些运行时检查显示记录存储在object
变量中(我已经知道,但在不同的上下文中)。所以我可以将fields_for
子句重写为:
<% form_for @account do |f| -%>
<% f.fields_for :employments do |e| -%>
<div class="employment">
<span class="name"><%= link_to h(e.object.person.name), person_path(e.object.person) %></span>
<span class="role"><%=h e.object.role %></span>
<span class="commands"><%= remove_child_link "Remove", e %></span>
</div>
<% end -%>
<% end -%>