Rails:带索引的fields_for? [英] Rails: fields_for with index?
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问题描述
是否存在执行fields_for_with_index
的方法(或实现类似功能的方法)?
Is there a method (or way to pull off similar functionality) to do a fields_for_with_index
?
示例:
<% f.fields_for_with_index :questions do |builder, index| %>
<%= render 'some_form', :f => builder, :i => index %>
<% end %>
正在渲染的部分内容需要知道fields_for
循环中的当前索引.
That partial being rendered needs to know what the current index is in the fields_for
loop.
推荐答案
实际上,按照Rails文档的详细说明,这将是更好的方法:
This would actually be a better approach, following Rails documentation more closely:
<% @questions.each.with_index do |question,index| %>
<% f.fields_for :questions, question do |fq| %>
# here you have both the 'question' object and the current 'index'
<% end %>
<% end %>
发件人: http://railsapi.com/doc/rails-v3.0.4/classes/ActionView/Helpers/FormHelper.html#M006456
还可以指定 要使用的实例:
It’s also possible to specify the instance to be used:
<%= form_for @person do |person_form| %>
...
<% @person.projects.each do |project| %>
<% if project.active? %>
<%= person_form.fields_for :projects, project do |project_fields| %>
Name: <%= project_fields.text_field :name %>
<% end %>
<% end %>
<% end %>
<% end %>
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