Rails嵌套具有预定义字段作为复选框的表单 [英] Rails nested forms with pre-defined fields as checkboxes

问题描述

我正在制作一个包含Room和RoomAttribute模型的酒店应用程序.这两个模型通过联接表在彼此之间具有many_to_many关系.每个模型的属性如下:

I'm making a hotel app that includes Room and RoomAttribute models. The two models have a many_to_many relationship between each other through a join table. The attributes for each model are as follows:

• Room – room_number，room_type(例如豪华"或套房")和price.
• RoomAttributes – name(例如无线互联网"，有线电视"，浴缸").

• Room – room_number, room_type (e.g. "deluxe" or "suite"), and price.
• RoomAttributes – name (e.g. "Wireless Internet", "Cable TV", "Bath Tub").

用户将首先创建一组房间属性，以便每次创建新房间时都可以将其选择为复选框.例如，有些房间可能有无线上网，有些则没有. app/views/rooms/new.html.erb的代码是(我很抱歉使用原始html).

The user will first create a set of room attributes, so that these can be selected as checkboxes every time a new room is created. For example, some rooms may have wireless internet and some don't. The code for app/views/rooms/new.html.erb is (my apologies for using raw html).

<form action="<%= rooms_path %>" method="post">
  <input type="hidden" name="authenticity_token" value="<%= form_authenticity_token %>">

  <label for="room_number">Room Number:</label>
  <input type="text" name="room[room_number]" id="room_number"> <br>

  <label for="room_type">Type:</label>
  <input type="text" name="room[room_type]" id="room_type"> <br>

  <label for="price">Price:</label>
  <input type="text" name="room[price]" id="price"> <br>

  <label for="room_attributes">Attributes:</label>
  <ul>
    <% @room_attributes.each do |room_attribute| %>
      <li>
        <input type="checkbox" name="room[room_attributes_ids][]" value="<%= room_attribute.id %>"> 
        <%= room_attribute.name %>
      </li>
    <% end %>
  </ul>

  <input type="submit" value="Submit">
</form>

我正在使用Rails 4，并且想就以下几点寻求建议:

I'm using Rails 4 and I'd like to ask for advice on the following:

• 使用表单助手或 formtastic 设置表单，以便它已经输出了所有预定义的房间属性，用户只需通过复选框选择要包含在会议室中的属性即可.
• 为此编写RoomController#create方法，以便将嵌套的RoomAttribute模型设置为房间属性.我的app/models/room.rb中是否需要accepts_nested_attributes_for :room_attributes?

• 在这种情况下如何合并强参数.我读过我应该使用

• Set up the form using form helpers or formtastic so that it already outputs all the pre-defined room attributes and users can simply select which attributes to include in the room via checkboxes.
• Write RoomController#create method for this so that it sets the nested RoomAttribute models as room attributes. Do I need accepts_nested_attributes_for :room_attributes in my app/models/room.rb?

• How to incorporate strong parameters in this scenario. I've read that I should use

params.require(:room).permit(:room_number, :room_type, :price, room_attributes_attributes: [:id]) 

但这对我不起作用.

谢谢！ :)

推荐答案

我能够通过简单地阅读Rails 4文档来解决它.我的Room模型的每个实例都有一个方法room_attribute_ids=.请注意，Rails将room_attributes单一化为room_attribute并在参数后附加了_ids，而我以前的实现使用了复数形式和:name_of_associated_model_attributes => [:id]约定.

I was able to solve it by simply digging into the Rails 4 documentation. Every instance of my Room model has a method room_attribute_ids=. Notice that Rails singularized room_attributes to room_attribute and appended an _ids for the param, whereas my previous implementation used the pluralized one and the :name_of_associated_model_attributes => [:id] convention.

因此，我在new.html.erb中列出了房间属性，如下所示:

Thus I list the room attributes in new.html.erb as follows:

<label for="room_attributes">Attributes:</label>
<ul>
  <% @room_attributes.each do |room_attribute| %>
    <li>
      <input type="checkbox" name="room[room_attribute_ids][]" value="<%= room_attribute.id %>"> 
      <%= room_attribute.name %>
    </li>
  <% end %>
</ul>

然后在控制器中，我定义了一个私有方法来为嵌套属性应用强参数:

Then in the controller I defined a private method to apply strong parameters for the nested attribute:

def room_params
  params.require(:room).permit(:room_number, :room_type, :price, :room_attribute_ids => [])
end

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