使用 fields_for 创建多条记录 - Rails [英] Create Multiple records with fields_for - Rails

问题描述

我有两个模型，task 和 list_items.一个 task 有_many list_items.但是我希望能够创建 task 和许多 list_items 如果用户想要所有这些都在一种形式中.这是目前的样子:

I have two models, task and list_items. a task has_many list_items. But I want to be able to be able to create task and many list_items if the user wants all in one form. Here is what it looks like currently:

<%= form_for @task, url: account_assignment_tasks_path(@assignment), method: :create do |form| %>
  <%= form.text_field :description, class: "form-input #{error_class}" %>

  <%= fields_for :list_items, @all_list_items do |list_item_form| %>
      <%= list_item_form.text_field :description, class: "form-input list-item", data: { list_item_field: "true" } %>
    <% end %>
<% end %>

任务控制器

 def new
   @task = @assignment.tasks.new
   @list_item = @task.list_items.build
   @all_list_items = []
 end

基本上我要做的是创建多个列表项和一项创建任务.但是现在如果我提交表单，我会收到这个错误

Basically what I'm trying to do is create multiple list items and one task on create. But right now I'm getting this error if I submit the form

undefined method `description' for []:Array

有人知道我做错了什么以及我如何做到这一点吗?

Does anybody know what I'm doing wrong and how I can achieve this?

推荐答案

[]:Array 的未定义方法 `description'

undefined method `description' for []:Array

为了描述错误的原因，fields_for 接受 record_object 作为第二个参数，fields_for 用它来构造强>领域.这里传递的是 @all_list_items，它是一个数组，会导致错误.

To describe the reason for the error, fields_for accepts record_object as a second parameter which fields_for uses it to construct the fields. Here you are passing @all_list_items which is an array and that results in the error.

错误的解决方法:

你应该通过 @list_item 而不是 @all_list_items

You should pass @list_item instead of @all_list_items

<%= fields_for :list_items, @list_item do |list_item_form| %>

实际问题的解决方案:

因为你想创建多个list_items，你应该这样做

As you want to create multiple list_items, you should do

def new
  @task = @assignment.tasks.new
  x.times do
    @list_item = @task.list_items.build
  end
  @all_list_items = []
end

其中x是你要创建多少个list_items，比如你要创建三个list_items，那么替换x 和 3.

where x is how many list_items you want to create, for example if you want to create three list_items, then replace x with 3.

或

使用 cocoon gem 动态创建嵌套表单.

Use cocoon gem to dynamically create nested forms.

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