文本哈希上的 Rails3 fields_for:未按预期工作 [英] Rails3 fields_for on text Hash: not working as expected

问题描述

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 循环来生成每个文本输入:

app/models/assessment.rb :

班级评估

app/view/assessments/new.html.erb:

<p>初始化答案:<%= @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 适当的问题，为简洁起见省略" %><br/><[e-mail][item_id] = ""%><%= answer_fields.text_field item_id, :value =>@assessment.answers[item_id] %>

<%结束%>

问题:fields_for 循环执行零迭代，没有字段被打印.
(尽管初始化答案:"显示正确:{"a"=>143, "b"=>42})

解决方案

这应该可以.本地测试.

<p>初始化答案:<%= @assessment.answers %></p><% @assessment.answers.each do |key, value|％＞<%= form.fields_for :answers, @assessment.answers[key] 做 |answer_fields|％＞<div class="field"><%= answer_fields.label 键 %><br/><%= answer_fields.text_field 键，:value =>值％＞

<%结束%><%结束%>

I have a rails3 form that allows the user to edit a list of answers, as part of an assessment.
I use a fields_for loop to generate each text input:

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/assessments/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 %>

PROBLEM: The fields_for loop does zero iteration, no field gets printed.
( despite "Initialized answers:" showing correctly: {"a"=>143, "b"=>42} )

解决方案

This should do. Tested locally.

<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 %>

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