使用 simple_form 和 rails 4 创建多个嵌套表单 [英] Creating multiple nested forms using simple_form and rails 4

问题描述

我正在尝试使用以下模型创建一个简单的应用程序:类别--[has_many]--> 问题--[has_many]--> 答案

I'm trying to create a simple app with the following models: categories --[has_many]--> questions --[has_many]--> answers

我有以下代码来创建类别+问题(类别/_form.haml.html):

I have the following code for creating categories + questions(categories/_form.haml.html):

= simple_form_for(@category) do |f|
  = f.error_notification
  = f.input :title, label: "Category title: "
  = f.simple_fields_for :questions, @category.questions.build do |q|
    = q.input :content, label: "Question content: "
  = f.button :submit

而且我使用所有相同的代码来创建问题 + 答案(questions/_form.haml.html).我已经配置了所有关系、强参数、嵌套属性和控制器，它对我来说很好用.

And I'm using all the same code for creating questions + answers(questions/_form.haml.html). I have all the relations, strong parameters, nested attrs and controllers configured, it works just fine for me.

两个问题:

1. 如何在类别/_form.haml.html 中创建多个问题?

1. How to create multiple questions in categories/_form.haml.html?

如何同时创建类别+多个问题+每个问题的多个答案(在类别/_form.haml.html中)?

How to create category + multiple questions + multiple answers per each question at once(in categories/_form.haml.html)?

我花了几个小时试图弄清楚如何完成第二个，我能找到的所有信息都与 Rails 3.0 和 form_for 相关.他们都没有为我工作.

I've spent a few hours trying to figure out how to accomplish the second one and all the info I was able to find is related to Rails 3.0 and form_for. None of them worked for me.

这里最直接的解决方案应该是:

The most straightforward solution here should be something like:

= simple_form_for(@category) do |f|
  = f.error_notification
  = f.input :title, label: "Category title: "
  = f.simple_fields_for :questions, @category.questions.build do |q|
    = q.input :content, label: "Question content: "
    = q.simple_fields_for :answers, q.questions.build do |a|
      = a.input :content, label: "Answer content"
  = f.button :submit

但它给了我

undefined method `questions' for #<SimpleForm::FormBuilder:

我在这里遗漏了什么?

推荐答案

你弄错了:= q.simple_fields_for :answers, q.questions.build do |a|您在构建器对象 q 而不是模型对象上调用 questions 方法.可能你想要这个:

You got it wrong here: = q.simple_fields_for :answers, q.questions.build do |a| You are calling questions method on builder object q instead of a model object. Probably You want this:

= q.simple_fields_for :answers, q.object.questions.build

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