grails - Grails mappedBy

Question

我在 Grails 中做一个简单的程序，并且遇到了多对多关系的问题。我有一个机场课程：

class Airport 
{
   static hasMany = [outgoingFlights:Flight, incomingFlights:Flight]
   static mappedBy = [outgoingFlights:'departureAirport', 
                      incomingFlights:'arrivalAirport']
}

和一个飞行类：

class Flight
{
   Airport departureAirport
   Airport arrivalAirport
}

出于某种原因，它给了我一个非常长且奇怪的 mappedBy 错误消息。mappedBy 代码有问题还是我还需要做其他事情？谢谢。

Answer 1

请试试这个：

class Flight
{
   static belongsTo = [departureAirport: Airport, arrivalAirport: Airport ]
   Airport departureAirport
   Airport arrivalAirport
}

重新创建您的数据库。