在Rails 4中使用fields_for ...不会保存新字段

时间：2016-06-06 21:18:27

标签： ruby-on-rails ruby-on-rails-4 fields-for

我正在尝试在我正在处理的项目中使用fields_for帮助方法。原始表单工作并保存得很好。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？！

这是我的上市模式：

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. 以下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

    5. 但是现在我在列表中显示NoMethodError显示错误。我为商业属性创建了一个部分。现在他们不应该被包括在内，因为他们处于强大的障碍中，或者我完全误解了这一点？！

    这是部分：

        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。

    列表中的NameError显示

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

    未定义的局部变量或方法`listing_commercial_attribute＆＃39;对于＃＆lt;＃：0x007f86606f6a10＆gt; 你的意思是？ listing_collection_url

    • 燃气管道尺寸：＆lt;％= listing_commercial_attribute.gas_pipe_size（@listing）％＆gt;
    • 安培：＆lt;％= listing_commercial_attribute.amperage（@listing）％＆gt;
    • 地下室天花板高度：＆lt;％= listing_commercial_attribute.basement_celing_height（@listing）％＆gt;
    • 天花板高度：＆lt;％= listing_commercial_attribute.ceiling_height（@listing）％＆gt;
    • 门尺寸：＆lt;％= listing_commercial_attribute.door_size（@listing）％＆gt;
    • 分区：＆lt;％= listing_commercial_attribute.zoning（@listing）％＆gt;

    模板包含跟踪：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

    我一直收到这个错误：

    在ListingsController＃show

    中的ActiveRecord :: RecordNotFound

    无法找到具有＆＃39; id＆＃39; = 5755

    的ListingCommercialAttribute

    它正在搜索id为5755的commercial属性，但这是列表ID。我不知道该在那里传递什么...

1 个答案:

答案 0 :(得分：1)

  1. 不要在两个模型上定义accepts_nested_attributes_for。仅在父模型上。否则，您将遇到循环依赖问题。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，而你的关联稍微偏离。您有has_one : listing_commerical_attribute，因此您需要f.fields_for : listing_commerical_attribute。
  3. 强参数应首先要求您的父对象，然后包含嵌套对象。此外，您必须将_attributes附加到嵌套属性名称的末尾。

    4. 所以，对于3：

    def listing_params
  params.require(:listing)
        .permit(:id,
                # ...
                listing_commercial_attribute_attributes: [ # Note: _attributes
                  :gas_pipe_size,
                  # ...
                ])
end
    1. 在创建/编辑操作中，请务必使用强参数方法设置参数：@listing.attributes = listing_params。

      2. 在accepts_nested_attributes_for和Strong Parameters上的文档中阅读更多内容。

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