我有一个rails3表单,允许用户编辑答案列表,作为评估的一部分
我使用fields_for
循环生成每个文本输入:
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”=&gt; 143,“b”=&gt; 42})
答案 0 :(得分:18)
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 %>
答案 1 :(得分:6)
将Hash转换为OpenStruct对象解决了我的问题。
<% form.fields_for :answers, OpenStruct.new(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>