Rails 3 - 创建视图以插入多条记录 [英] Rails 3 - Create View to Insert Multiple Records

问题描述

我有一个看似简单的查询.我需要创建一个基于单个模型接受多个记录的视图.在我的例子中，模型是 Project，它有 1 个外键(人)和 2 个字段时间、角色.我需要创建一个视图(表单)来插入 5 个角色.

<%= form_for(@project) do |f|％＞<% 5.times do |index|%><div class="field"><%= f.label:位置%><br/><%= f.text_field "fields[#{index}][stime]" %>

<%结束%><div class="actions"><%= f.submit %>

<%结束%>

我收到一条错误消息:未定义的方法`fields[0][stime]'

我不认为嵌套模型的 railscasts 是我需要的.

我将如何创建这个?

项目模型代码如下:

class 项目 <ActiveRecord::Base归属于:人attr_accessible :role, :stime结尾

新方法的 Projects_Controller 代码如下:

def new@project = Project.new结尾

解决方案

我看到你正计划建立一些一对多的关系(Product has_many :roles).

这里有一些建议.

首先看一下accepts_nested_attributes_for 方法.您需要将其添加到您的模型中才能执行批量创建.

其次，fields_for 是什么您需要设计嵌套表单.

我会给你一些批量创建简单Product has_many :line_items 案例的例子:

<%= form_for @product do |f|％＞<%= f.fields_for :line_items, [LineItem.new]*5 做 |li_fields|％＞<%= li_fields.text_field :数量 %><%= li_fields.text_field :price %><br><%结束%><%= f.submit 创建订单项"；％＞<%结束%>

您所需要的只是在控制器中编写如下内容:

@product.update_attributes params[:product]

和 5 个 line_items 将同时创建.

不要忘记将 association_attributes 列入白名单(请参阅日志中的 params 以查看它).但我认为，如果您遇到批量分配错误，您无论如何都会这样做:)

希望能帮到你.

I have what seems like a simple query. I need to create a view that will accept multiple records based on a single model. In my case the model is Project, which has 1 foreign key (person) and 2 fields time, role. I need to create a view (form) to insert 5 roles.

<%= form_for(@project) do |f| %>
 <% 5.times do |index|%>
  <div class="field">
    <%= f.label :position %><br />
    <%= f.text_field "fields[#{index}][stime]" %>
  </div>

 <% end %>
 <div class="actions">
     <%= f.submit %>
 </div>  
<% end %>

I get an error message: undefined method `fields[0][stime]'

I do not think the railscasts for nested models is what I need.

How would I go about creating this?

EDIT: The Project model code is below:

class Project < ActiveRecord::Base
   belongs_to :person
   attr_accessible :role, :stime
end

The Projects_Controller code for the new method is below:

def new
 @project = Project.new
end

解决方案

I see you're planning to make some 1-to-many relationship (Product has_many :roles).

Here's some advices.

First, take a look at the accepts_nested_attributes_for method. You need to add it to your model to be able to perform mass-create.

Second, fields_for is what you need to design nested forms.

I'll give you some example of mass-creating for a simple Product has_many :line_items case:

<%= form_for @product do |f| %>
    <%= f.fields_for :line_items, [LineItem.new]*5 do |li_fields| %>
      <%= li_fields.text_field :quantity %>
      <%= li_fields.text_field :price %>
      <br>
    <% end %>
  <%= f.submit "Create line items" %>
<% end %>

All you need is to write in you controller something like:

@product.update_attributes params[:product]

and 5 line_items will be created at once.

Don't forget to white-list association_attributes (see params in your logs to see it). But I think if you get the mass-assignment error you'll do it anyway :)

I hope it helps.

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