Ruby on rails Rails作为json的性能问题

我有一组活动模型记录。阵列中最多有75个对象。然而，该模型具有多个关联和关系。现在我正在重写as_json方法，以便只包含必要的字段。加载60个对象大约需要13秒。我怎样才能加快速度？我尝试过删除一些更复杂的查询，比如get_vehicles，假设我可以稍后加载，但这似乎对性能没有显著帮助

 def as_json
 hash = {}
 hash["title"] = calendar_title
 #hash["description"] = calendar_description
 hash["start"] = start_at.strftime("%Y-%m-%d")
 hash["end"] = end_at.strftime("%Y-%m-%d")
 hash["url"] = "/admin/appointments/#{id}"
 hash["base_amount"] = base_amount
 hash["start_at"] = start_at
 hash["end_at"] = end_at
 hash["tech_id"] = technician_id
 hash["asset_id"] = asset_id
 hash["customer_name"] = customer.full_name(false)
# hash["customer_id"] = customer_id
 hash["id"] = id
# hash["cust_addresses"] = customer.addresses
 hash["address"] = address
#   client_host = ClientHost::Location.find_by_id(address.client_host_locations_id)
# hash["customer_email"] = customer.email
# hash["customer_wholesale"] = customer.wholesale?
# hash["customer_tax_exempt"] = customer.tax_exempt?
# hash["vehicles"] = self.get_vehicles
end

def get_vehicles

vehicles = []
self.appointment_vehicles.each do |av|
  hash = {}
  hash["appointment_vehicle"] = av
  hash["total_amount"] = av.total_amount
  hash["vehicle"] = av.vehicle
  hash["package_display_title"] = av.package.display_title
  hash["package_amount"] = av.package.amount
  hash["upgrades"] = self.get_upgrades(av.upgrades)
  vehicles.push(hash)
end
return vehicles

---

结束

我不确定能不能把你带到这里，但我会好好挖掘一下

require 'oj'
def get_vehicles
  vehicles = self.appointment_vehicles.map do |av|
    {
      appointment_vehicle: av,
      total_amount: av.total_amount,
      vehicle: av.vehicle,
      package_display_title: av.package.display_title,
      package_amount: av.package.amount,
      upgrades: self.get_upgrades(av.upgrades)
    }
  end

  vehicles
  # Oj.dump(vehicles) <-- if you need this hash as json
end

需要“oj”
def get_车辆
车辆=自行预约_车辆.map do | av|
{
预约车辆：av，
总金额：平均总金额，
车辆：av.vehicle，
包装显示标题：av.package.display标题，
套餐金额：平均套餐金额，
升级：自我升级（av.升级）
}
结束
车辆
#转储（车辆）您可以显示查询以从数据库检索记录吗？