級聯刪除與Grails中的多對多映射關係

Question

我有關於多對多映射的問題。

[案例]

• 帳戶擁有共同體（所有者）
• 社區有許多客戶（會員）

當我刪除社區的情況下，所有者帳戶也被刪除。

我不希望所有者帳戶被刪除。

我的映射是錯誤的？

[域類]

class Account { 

String name 

static hasMany = [communities: Community] 
static belongsTo = [Community] 
} 

class Community { 

String name 
Account owner 

static hasMany = [members: Account] 
} 

[TestCode]

def admin = new Account(name: 'admin').save(flush:true) 
def user = new Account(name: 'user').save(flush:true) 

def c = new Community(name: 'TestCommunity') 

c.owner = admin 

c.addToMembers(admin) 
c.addToMembers(user)    
c.save(flush:true) 

c.removeFromMembers(user) 
c.save(flush:true) 

c.delete(flush:true) 

[休眠日誌]

Hibernate: insert into account (id, version, name) values (null, ?, ?) 
Hibernate: insert into community (id, version, name, owner_id) values (null, ?, ?, ?) 
Hibernate: update account set version=?, name=? where id=? and version=? 
Hibernate: insert into community_members (community_id, account_id) values (?, ?) 
Hibernate: update account set version=?, name=? where id=? and version=? 
Hibernate: update community set version=?, name=?, owner_id=? where id=? and version=? 
Hibernate: delete from community_members where community_id=? and account_id=? 
Hibernate: delete from community_members where community_id=? 
Hibernate: delete from community where id=? and version=? 
Hibernate: delete from account where id=? and version=?   <== not expected !! 

Answer 1

你必須提供休眠相當於on delete set null映射

已經有一個關於它的問題。請參閱它的進一步細節How do I override the cascade delete for a relation in Grails GORM?