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我有一个观察者，当记录（预订）的状态发生变化时，他会创建一些记录（票证）。运行应用程序时它工作正常。但不会在迁移期间或在 rails 控制台中运行。我能理解，它应该

这是在 application.rb

# Activate observers that should always be running.
config.active_record.observers = :booking_observer

这是观察者（booking_observer.rb）

编码：utf-8

class BookingObserver < ActiveRecord::Observer
  require 'logger'

  def create_ticket(booking, passenger, leg)
    ticket = Ticket.factory(booking, passenger, leg)
    begin
      ticket.save!
    rescue Exception => e
      booking.logger.error "Can't save #{leg} ticket: #{e}"
    end
  end

  def after_update(booking)
    if booking.changed? && booking.changed_attributes()["status"]!=Booking::CONFIRMED && booking.status==Booking::CONFIRMED.to_sym
      passengers = booking.passengers.all
      passengers.each do |passenger|
        booking.logger.error "Passenger: #{passenger}"
        create_ticket(booking, passenger, Booking::DEPARTURE_LEG)
        create_ticket(booking, passenger, Booking::RETURN_LEG) if booking.booking_type.to_sym != :ow
      end
    end
  end
end

这是一个示例迁移

class CreateTicketsForValidBookings < ActiveRecord::Migration
  def up
    bookings = Booking.where("departure_date < ?", 1.minute.ago).where(status: "confirmed")
    bookings.each do |booking|
      booking.status="migrating"
      booking.save
      booking.status="confirmed"
      booking.save
    end
  end

  def down
    bookings = Booking.where("departure_date < ?", 1.minute.ago).where(status: "migrating")
    bookings.each do |booking|
      booking.status="confirmed"
      booking.save
    end
  end
end

在我发现的每一个帖子中，人们都试图禁用观察者。好吧，就我而言，它是倒退的

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1 回答 1

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事实证明，您必须在每个环境的基础上启用观察者。这三个文件

config/enviroments/development.rb
config/enviroments/test.rb
config/enviroments/production.rb

必须激活应该始终运行的观察者。

config.active_record.observers = :booking_observer
于 2012-08-16T05:24:36.250 回答