兩個域對象之間的多重關係

Question

我有兩個域類：Contract和Orgainisation。合同有一個contractor（這是Orgaisation的實例）和許多/一個/無beneficiaries（也是Orgaisation的實例）。我如何模擬這些關係？我想Contract自己既關係，這樣我可以這樣做：

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

我嘗試了一些東西，但一直得到錯誤（瞬時值，對於許多一對多的關係等沒有所屬的類...）合同

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

orgainisation

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

我如何表達這些關係？

編輯：我忘了提及合同 - 受益人應該是一個多對多的協會（我想重新使用合同的受益人）。

Answer 1

我的解決方案是使用描述性名稱來明確M：M加入類。在你的情況，似乎我們可以做一個類ProvidedService或類似的東西，並有：

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] 
}