Question

我很难看到我在这里做错了什么..

我有一个订单模型，需要能够容纳一个产品，产品需要是多态的。

我有一个名为orthosis_specification的产品/型号，出于某种原因，当我在fields_for创建中使用它时，我收到此错误。

迁移 -

class CreateOrders < ActiveRecord::Migration
  def change
    create_table :orders do |t|
      t.datetime :order_date
      t.datetime :date_required
      t.boolean :correct
      t.references :user, index: true, foreign_key: true
      t.references :practitioner, index: true, foreign_key: true
      t.references :product, polymorphic: true
      t.references :shipping_address, index: true, foreign_key: true
      t.references :invoice_address, index: true, foreign_key: true
      t.timestamps null: false
    end
  end
end

订单控制器 -

  def new
    @order = Order.new
    @order.build_patient
    @order.build_product #Also tried: @order.build_orthosis_specification
  end

订单型号 -

class Order < ActiveRecord::Base
  has_one :patient
  belongs_to :product, polymorphic: true
  accepts_nested_attributes_for :patient,
                                reject_if: proc { |attributes| attributes['first_name'].blank? },
                                allow_destroy: true
  accepts_nested_attributes_for :product,
                                reject_if: proc { |attributes| attributes['transfer_name'].blank? },
                                allow_destroy: true

  def to_s
    name
  end
end

矫形器规格模型 -

class OrthosisSpecification < ActiveRecord::Base
    has_one :order, :as => :product, class_name: 'Order'
end

订单查看 -

  <%= form_for(@order) do |f| %>
  <% if @order.errors.any? %>
  <% end %>

<%= f.fields_for :orthosis_specification do |fa| %>

实际错误讯息 -

undefined method `build_orthosis_specification' for #<Order:0x007f8950e29970>

矫形器规格迁移 -

class CreateOrthosisSpecifications < ActiveRecord::Migration
  def change
    create_table :orthosis_specifications do |t|
      t.string :transfer_name
      t.string :modifications
      t.string :primary_mods
      t.string :top_opening
      t.string :side_opening
      t.string :chape_position
      t.string :scan_file
    end
  end
end

非常感谢任何帮助，谢谢！

Answer 1

多态关联不会生成build_xxx方法。只有在您知道要创建的产品类型时，才能创建新产品：

#Creating a new OrthosisSpecification product associated with @order :
@order.product = OrthosisSpecification.new

文档：http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html

多态关联未定义方法`build_product＆＃39;

1 个答案: