grails - 两个领域对象之间的多重关系

Question

我有两个域类:Contract和Orgainisation。契约(Contract)具有一个contractor(这是Orgaisation的一个实例)和许多/一个/没有beneficiaries(这也是Orgaisation的实例)。如何建立这些关系的模型？我希望Contract拥有这两种关系，以便可以执行以下操作:

contractInstance = new Contract()
contractInstance.addToBeneficiaries(name: 'A Company')
contractInstance.addToBeneficiaries(name: 'Other Company')
contractInstance.contractor = new Orgaisation('Antoher Company')
contractInstance.save()

我尝试了一些尝试，但仍收到错误消息( transient 值，对于多对多关系没有所属类，等等)

契约(Contract)

static belongsTo = [contractor:Organisation]
static hasMany = [beneficiaries:Organisation]

组织化

static hasMany = [contractorContracts:Contract, beneficiariesContracts:Contract]

我如何代表这些关系？

编辑:我忘了提到契约(Contract)受益人应该是一个多对多的协会(我想重用契约(Contract)中的受益人)。

Answer 1

我的解决方案是使用描述性名称明确显示M:M加入类。在您的情况下，似乎我们可以创建一个ProvidedService或类似的类，并具有:

Contract {
  static belongsTo = [contractor: Organization]
  static hasMany = [benefits: ProvidedService]
}
Organization {
  static hasMany = [contractorContracts: Contract, receivedServices: ProvidedService]
}
ProvidedService {
  //Feasibly there could be differences in the service provided to each beneficiary of a contract which could go in here.
  static belongsTo = [contract: Contract, serviceRecipient: Organization]
}