作为评估的一部分,我有一个rails3表单,允许用户编辑答案列表.
我使用fields_for循环来生成每个文本输入：
我使用fields_for循环来生成每个文本输入：
app / models / assessment.rb：
class Assessment < ActiveRecord::Base serialize :answers,Hash # answers is a t.text field used to store all answers. end
app / view / assessment / new.html.erb：
<p>Initialized answers: <%= @assessment.answers %></p>
<% item_counter = 0 %>
<% form.fields_for :answers do |answer_fields| %>
<% item_id = "item" + item_counter.to_s %>
<% item_counter = item_counter + 1 %>
<div class="field">
<%= answer_fields.label "the appropriate question,omitted for brevity" %>
<br/>
<% @assessment.answers[item_id] = "" %>
<%= answer_fields.text_field item_id,:value => @assessment.answers[item_id] %>
</div>
<% end %>
问题：fields_for循环执行零迭代,不打印任何字段.
(尽管“初始化答案：”正确显示：{“a”=> 143,“b”=> 42})
解决方法
这应该做.在本地测试
<p>Initialized answers: <%= @assessment.answers %></p>
<% @assessment.answers.each do |key,value| %>
<%= form.fields_for :answers,@assessment.answers[key] do |answer_fields| %>
<div class="field">
<%= answer_fields.label key %>
<br/>
<%= answer_fields.text_field key,:value => value %>
</div>
<% end %>
<% end %>