在 Rails 4 中使用 fields_for ......不会保存新字段

Question

我正在尝试在我正在处理的项目中使用 fields_for 辅助方法。原始表格可以正常工作并保存得很好。新属性不保存，我得到一个 NoMethodError 和一个未定义的方法。我错过了什么？！

这是我的列表模型：

class Listing < ActiveRecord::Base
has_one :listing_commerical_attribute
accepts_nested_attributes_for :listing_commerical_attribute, :allow_destroy => true

这是我的 listing_commercial_attribute 模型：

class ListingCommercialAttribute < ActiveRecord::Base
  belongs_to :listing
  accepts_nested_attributes_for :listing
end

这是我的控制器：

def new
  @listing.build_listing_commercial_attribute

  respond_to do |format|
    format.html # new.html.erb
    format.json { render json: @listing }
  end
end

private

def commercial_params
  params.require(:commerical_listing_attribute)
      .permit(:gas_pipe_size,
              :amperage,
              :basement_ceiling_height,
              :ceiling_height,
              :door_size,
              :zoning,
              :previous_use,
              :community_board,
              :delivery_date,
              :key_money,
              :security_deposit,
              :price_per_sq_ft,
              :did_size)
end

这是我的 _form.html.erb：

<h2 class="text-center">Commercial</h2>
 <%= f.fields_for :listing_commerical_attributes do |ff| %>
<div class="field">
  <%= ff.label :gas_pipe_size, "Gas Pipe Size", class: "general-text-label" %>
  <%= ff.number_field :gas_pipe_size, class: "general-text-field" %>
</div>
<div class="field">
  <%= ff.label :amperage, "Amperage", class: "general-text-label" %>
  <%= ff.number_field :amperage, class: "general-text-field" %>
</div>
<div class="field">
  <%= ff.label :ceiling_height, "Ceiling Height", class: "general-text-label" %>
  <%= ff.number_field :ceiling_height, class: "general-text-field" %>
</div>
<div class="field">
  <%= ff.label :basement_ceiling_height, "Basement Ceiling Height", class: "general-text-label" %>
  <%= ff.number_field :basement_ceiling_height, class: "general-text-field" %>
</div>
<div class="field">
  <%= ff.label :door_size, "Door Size", class: "general-text-label" %>
  <%= ff.number_field :door_size, class: "general-text-field" %>
</div>
<div class="field">
  <%= ff.label :zoning, "Zoning", class: "general-text-label" %>
  <%= ff.text_field :zoning, class: "general-text-field" %>
</div>
<div class="field">
  <label for="tenant_improvements" class="general-text-label">Tenant Improvements <small>(If Applicable)</small></label>
  <%= ff.text_area :tenant_improvements, :rows => "4", class: "general-text-area" %>
</div>
<div class="field">
  <label for="previous_use" class="general-text-label">Previous Use <small>(If Applicable)</small></label>
  <%= ff.text_area :previous_use, :rows => "4", class: "general-text-area" %>
</div>
<div class= "field">
  <%= ff.label :community_board, "Community Board", class: "general-text-label" %>
  <%= ff.text_field :community_board, class: "general-text-field" %>
</div>
<div class="field">
  <%= ff.label :delivery_date, "Delivery Date", class: "general-text-label" %>
  <div class="input-group">
    <span class="input-group-addon"><i class="nklyn-icon-calendar"></i></span>
    <%= ff.text_field :delivery_date, :class => "datepicker general-text-field" %>
</div>
<div class="field">
  <%= ff.label :key_money, "Key Money", class: "general-text-label" %>
  <div class="input-group">
    <span class="input-group-addon"><i class="nklyn-icon-money-bills"></i></span>
    <%= f.text_field :key_money, class: "general-text-field", value: number_with_precision(f.object.price, delimiter: ',', precision: 0) %>
  </div>
</div>
<div class="field">
  <%= ff.label :security_deposit, "Security Deposit", class: "general-text-label" %>
  <div class="input-group">
    <span class="input-group-addon"><i class="nklyn-icon-money-bills"></i></span>
    <%= f.text_field :security_deposit, class: "general-text-field", value: number_with_precision(f.object.price, delimiter: ',', precision: 0) %>
  </div>
</div>
<div class="field">
  <%= ff.label :price_per_sq_ft, "Price Per Sq Ft", class: "general-text-label" %>
  <div class="input-group">
    <span class="input-group-addon"><i class="nklyn-icon-money-bills"></i></span>
    <%= f.text_field :price_per_sq_ft, class: "general-text-field", value: number_with_precision(f.object.price, delimiter: ',', precision: 0) %>
  </div>
</div>
<div class="field">
  <%= ff.label :did_size, "Drive In Doors Size", class: "general-text-label" %>
  <%= ff.number_field :did_size, class: "general-text-field" %>
</div>
<% end %>

---

更新

1. 我对 ListingCommercialAttribute 模型进行了更改并删除了接受嵌套属性。

2. 我将 f.fields_for 更改为单数而不是复数。

3. 我在父级之后添加了嵌套属性（见下文）

   def listing_params
      params.require(:listing)
         .permit(:access,
             :address,
             :apartment,
             :cats_ok,
             :cross_streets,
             :dogs_ok,
             :latitude,
             :longitude,
             :amenities,
             :date_available,
             :bathrooms,
             :bedrooms,
             :description,
             :fee,
             :exclusive,
             :featured,
             :rental,
             :residential,
             :landlord_contact,
             :listing_agent_id,
             :sales_agent_id,
             :neighborhood_id,
             :pets,
             :photo,
             :photo_tag,
             :primaryphoto,
             :price,
             :square_feet,
             :station,
             :status,
             :subway_line,
             :term,
             :title,
             :utilities,
             :move_in_cost,
             :owner_pays,
             :private,
             :office_id,
             :full_address,
             :zip,
             :convertible,
             :landlord_llc,
             :pinned,
             :image,
             listing_commercial_attribute_attributes: [
             :gas_pipe_size,
             :amperage,
             :basement_ceiling_height,
             :ceiling_height,
             :door_size,
             :zoning,
             :previous_use,
             :community_board,
             :delivery_date,
             :key_money,
             :security_deposit,
             :price_per_sq_ft,
             :did_size])
   end
   

4. 这是我的新控制器操作：

   def edit
      @listing.attributes = listing_params
   end
   
   def create
      @listing.attributes = listing_params
   
      respond_to do |format|
        if @listing.save
           format.html { redirect_to @listing, notice: 'Listing was successfully created.' }
           format.json { render json: @listing, status: :created, location: @listing }
        else
           format.html { render action: "new", notice: "Correct the mistakes below to create the new listing" }
           format.json { render json: @listing.errors, status: :unprocessable_entity }
       end
     end
   end
   

但现在我在 Listings#show 错误中收到 NoMethodError。我为商业属性创建了一个部分。既然它们在强大的参数中，难道不应该将它们包括在内吗？还是我完全误解了这一点？！

这是部分内容：

    Gas Pipe Size: <%= listing_commercial_attributes.gas_pipe_size(@listing) %>
    Amperage: <%= listing_commercial_attribute.amperage(@listing) %>
    Basement Ceiling Height: <%= listing_commercial_attribute.basement_celing_height(@listing) %>
    Ceiling Height: <%= listing_commercial_attribute.ceiling_height(@listing) %>
    Door Size: <%= listing_commercial_attribute.door_size(@listing) %>
    Zoning: <%= listing_commercial_attribute.zoning(@listing) %>
    Build to Suit: <%= listing_commercial_attribute.build_to_suit(@listing) %>
    Previous Use: <%= listing_commercial_attribute.previous_use(@listing) %>
    Community Board: <%= listing_commercial_attribute.community_board(@listing) %>
    Delivery Date: <%= listing_commercial_attribute.delivery_date(@listing) %>
    Key Money: <%= listing_commercial_attribute.key_money(@listing) %>

---

更新 #2

我把它改成了单数。

这是完整的错误。

Listings中的NameError#show

显示 /Users/Code/app/views/listings/_commercial_attributes.html.erb 其中第 1 行提出：

# 的未定义局部变量或方法 `listing_commercial_attribute' 你的意思是？ Listing_collection_url

• 燃气管道尺寸：
• 安培数：
• 地下室天花板高度：
• 天花板高度：
• 门尺寸：
• 分区：

模板包含的痕迹：app/views/listings/_listing_content_area.html.erb、app/views/listings/show.html.erb

---

更新 #3

  def show
      @my_listing_collections = ListingCollection.with_agent(current_agent).order("created_at DESC")
      @listing_commercial_attributes = ListingCommercialAttribute.find(params[:id])
      @regions = Region.order(name: :asc)
      @listing = Listing.includes(:photos, :likes, :interested_agents).find(params[:id])

      if @listing.private && cannot?(:create, Listing)
        redirect_to listings_path, notice: 'This listing is no longer available'
      else
        agent = Agent.where(id: params[:agent_id]).first
        @page = Listings::ShowView.new(@listing, agent)

        respond_to do |format|
          format.html
        end
      end
    end

我不断收到此错误：

ListingsController#show 中的 ActiveRecord::RecordNotFound

找不到 'id'=5755 的 ListingCommercialAttribute

它正在搜索 id 为 5755 的商业属性，但那是列表 id。我不知道该传递什么...

Answer 1

1. 不要在两个模型上定义accepts_nested_attributes_for。仅在父模型上。否则你会遇到循环依赖问题。在这种情况下，父模型看起来像是一个列表，因此请从 ListingCommercialAttribute 中删除 accepts_nested_attributes_for :listing。
2. f.fields_for 的第一个参数应该是关联的名称，而您的名称稍有偏差。你有has_one : listing_commerical_attribute，所以你想要f.fields_for : listing_commerical_attribute。
3. Strong 参数应该首先需要您的父对象，然后再包括嵌套对象。此外，您必须将 _attributes 附加到嵌套属性名称的末尾。

所以，对于 3：

def listing_params
  params.require(:listing)
        .permit(:id,
                # ...
                listing_commercial_attribute_attributes: [ # Note: _attributes
                  :gas_pipe_size,
                  # ...
                ])
end

4. 在创建/编辑操作中，请务必从强参数方法中设置参数：@listing.attributes = listing_params。

在accepts_nested_attributes_for 和Strong Parameters 的文档中了解更多信息。