Class 与自身有嵌套关联

Question

我有一个 class 与自身的嵌套关联：

class Location < ActiveRecord::Base
  has_many :location_gateways
  has_many :gateways, through: :location_gateways, class_name: "Location", :dependent => :destroy 
  accepts_nested_attributes_for :gateways, reject_if: :all_blank, allow_destroy: true
  belongs_to :location, optional: true
end

连接型号：

class LocationGateway < ActiveRecord::Base
  belongs_to :location, :class_name => "Location"
  belongs_to :gateway, :class_name => "Location"
end

现在我想制作一个可以创建位置和一些网关的表单，但是当我提交它时出现 Gateway must exist 错误（对 Location.new 的调用）

我假设这是因为模型 Gateway 不存在。我怎样才能让 rails 明白它应该创建另一个 Location 而不是 Gateway？

Answer 1

找不到解决此错误的方法。我必须制作一个新的 class Gateway 继承自 Location 并向 Locations (STI) 添加 type。

Class 与自身有嵌套关联

Class with nested association to itself

ruby-on-rails-5

nested-attributes