如何维护已删除对象的关联?

我有个目标 PortStock ,我一直在跟踪via OrderHistory port_stock 对象,我创建一个 order_history 与之关联的对象 港口股票 .

港口股票

港口股票 对象,我仍然希望能够检索(并显示)所有 订单历史 港口股票

我现在就是这样做的,但当 @port_stock 已删除:

@port_stock = current_user.port_stocks.friendly.find(params[:id])
@stock = @port_stock.stock
@order_histories = OrderHistory.joins(:port_stock).where(port_stocks: { ticker: @stock.ticker}).group_by { |o| o.port_stock }

思想?

编辑1

我的

# == Schema Information
#
# Table name: port_stocks
#
#  id                :bigint(8)        not null, primary key
#  portfolio_id      :integer
#  stock_id          :integer
#  volume            :integer
#  action            :integer
#  position          :integer          default("open")
#  ticker            :string
#

class PortStock < ApplicationRecord
  extend FriendlyId
  friendly_id :ticker
  belongs_to :portfolio
  belongs_to :stock
  has_many :order_histories

  enum action: [ :buy, :sell ]
  enum position: [ :open, :closed ]
end

我的 订单历史记录

# == Schema Information
#
# Table name: order_histories
#
#  id                :bigint(8)        not null, primary key
#  port_stock_id     :integer
#  num_units         :integer
#  action            :integer
#  created_at        :datetime         not null
#  updated_at        :datetime         not null
#

class OrderHistory < ApplicationRecord
  belongs_to :port_stock
  enum action: [ :buy, :sell ]
end