Java 为什么groovy/grails没有添加外键约束

当我运行groovy/grails应用程序时，address字段和visitingAddres会在数据库中正确地创建外键约束。但是，我添加了court字段，应用程序不会自动为该字段创建外键约束

class Municipality {

static hasMany = [ cases : Case ]
Court court
Address address
Address visitingAddress

    
static constraints = {

    
    address nullable: false
    visitingAddress nullable: false
    cases nullable: true
    court nullable: false 

}

  This is how the table is looking:       

     municipality | CREATE TABLE `municipality` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
   `address_id` bigint(20) NOT NULL,
  `visiting_address_id` bigint(20) NOT NULL,
  `court_id` bigint(20) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `FK_hdo14fu6i4yo9fma1bfd4jfh7` (`address_id`),
  KEY `FK_esxb2ag360tnvpvcwgntk65ys` (`visiting_address_id`),
  CONSTRAINT `FK_esxb2ag360tnvpvcwgntk65ys` FOREIGN KEY (`visiting_address_id`) REFERENCES `address` (`id`),
  CONSTRAINT `FK_hdo14fu6i4yo9fma1bfd4jfh7` FOREIGN KEY (`address_id`) REFERENCES `address` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=latin1 |

---

需要一个默认值

加：

静态映射={ 法院违约价值：“1” }