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Question

以下是代码：

= form_for @form do |f|
  = f.fields_for :questions do |q|
    %p
      = q.object.content
      = q.fields_for :answers do |a|
        %p= a.text_area :content

text_area上的名称属性应该是form[questions_attributes][0][answer_attribute][content]，但它正在显示。 form[questions_attributes][0][answers][content]。

这是我的模特。

# answer.rb
  belongs_to :question

# question.rb
  has_one :answer
  accepts_nested_attributes_for :answer

# form.rb
  has_many :questions, :order => 'position ASC'
  accepts_nested_attributes_for :questions

所以我在日志中得到的是WARNING: Can't mass-assign protected attributes: answers

非常感谢任何帮助。谢谢！

更新

这是日志，所以你可以看到传递的内容：

Started POST "/forms/16" for 127.0.0.1 at Fri Mar 09 16:53:58 -0500 2012
  Processing by FormsController#update as HTML
  Parameters: {"commit"=>"Update Form", "utf8"=>"✓", "id"=>"16", "authenticity_token"=>"mcRJP8XgvE0Cl1JsPryER47+Hbx5DwpEveR1m0R7S6k=", "form"=>{"opportunity_id"=>"1", "questions_attributes"=>{"0"=>{"id"=>"101", "answers"=>{"content"=>"asdfasdf"}}, "1"=>{"id"=>"102", "answers"=>{"content"=>"asdfasdf"}}, "2"=>{"id"=>"103", "answers"=>{"content"=>"asdfasdf"}}, "3"=>{"id"=>"104", "answers"=>{"content"=>""}}, "4"=>{"id"=>"105", "answers"=>{"content"=>""}}, "5"=>{"id"=>"106", "answers"=>{"content"=>""}}, "6"=>{"id"=>"107", "answers"=>{"content"=>""}}, "7"=>{"id"=>"108", "answers"=>{"content"=>""}}}, "status"=>"Not Reviewed", "current_step"=>"", "account_id"=>"1"}}
  SQL (0.8ms)   SELECT name
 FROM sqlite_master
 WHERE type = 'table' AND NOT name = 'sqlite_sequence'

  Form Load (0.2ms)  SELECT "forms".* FROM "forms" WHERE "forms"."id" = 16 LIMIT 1
  Question Load (1.1ms)  SELECT "questions".* FROM "questions" WHERE "questions"."id" IN (101, 102, 103, 104, 105, 106, 107, 108) AND ("questions".form_id = 16) ORDER BY position ASC
WARNING: Can't mass-assign protected attributes: answers
WARNING: Can't mass-assign protected attributes: answers
WARNING: Can't mass-assign protected attributes: answers
WARNING: Can't mass-assign protected attributes: answers
WARNING: Can't mass-assign protected attributes: answers
WARNING: Can't mass-assign protected attributes: answers
WARNING: Can't mass-assign protected attributes: answers
WARNING: Can't mass-assign protected attributes: answers
Redirected to http://vol.dev/forms/16
Completed 302 Found in 208ms

更新2

当我在answers中向attr_accessible添加question.rb时，我得到ActiveRecord::UnknownAttributeError (unknown attribute: answers)

Answer 1

我将模型中的所有内容保留原样，但我按照以下形式进行了操作：

 = f.fields_for :questions do |q|
    = q.fields_for :answer, q.object.answer do |a|
      = a.hidden_field :question_id, :value => q.object.id
      = a.hidden_field :form_id, :value => @form.id
      %p
        = a.label :content, q.object.content
        %br
        = a.text_area :content

它完美无缺。如果有任何改进或任何事情可以随意发表评论。

Answer 2

你需要在form.rb

中有问题的attr_accessible

attr_accessible :questions_attributes

您可能还必须将form.rb中的所有其他字段添加到attr_accessible。

Answer 3

在我的结局Marc上有同样的问题。

这不适合你的两个原因是：

您的has_one与question之间的关联为answer，因此您需要在fields_for参数中使用单数版本：

q.fields_for :answer
您需要为问题建立答案（最好在您的控制器中）：

question.build_answer

你最后在你发布的新表单代码中做了这些，但我想我会解释为什么它起作用。

干杯，

JP

嵌套属性不能正确呈现fields_for属性

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更新2

3 个答案: