Question

在我的应用程序中，我有一组1000个左右的“HouseProto”域对象，它们在我的“HouseInstance”对象中有一堆静态属性。

在规模上，可能会有很多HouseInstance对象，每个对象都在HouseProtos上建模。以下是我尝试对HouseInstance域对象进行建模的方法。

class HouseInstance {
    @Delegate
    HouseProto houseProto
    User agent
    static belongsTo=[world: World]
    static constraints = {
        agent nullable:true
    }
}

HouseProto有很多字段，如“squareFeet”和“bedroomCount”等。我使用@Delegate注释，因为我希望能够做类似

的事情

houseInstance.streetAddress

而不是

houseInstance.houseProto.streetAddress

但这在编译时失败了。埋在控制台输出结尾处的是对HouseProto（一个hasMany Set）的“features”字段的引用，该字段暗示可能与它有关。删除委托注释，但一切正常。（Feature是属于HouseProto的域类。）

我的问题是@Delegate注释是否与Domain类不兼容，因为它因某些原因干扰了GORM？如果它可以编译，它似乎会做我想要的。

HouseProto或多或少看起来像这样：

class HouseProto {
    def houseService

    String streetAddress
    Owner owner
    Integer sqft
    Double acreage
    Integer bedroom
     ...
    Double kitchenQuality =0
    Double loanBalance =0
    Neighborhood neighborhood

    String toString() {
        "$streetAddress"
    }
    static hasMany = [features: Feature]
    static constraints = {
        streetAddress nullable: false, unique: true;
        owner nullable: true
        sqft nullable: false
        neighborhood nullable: false

    } 
  }

运行时控制台输出以此开头：

ERROR org.springframework.boot.context.embedded.tomcat.TomcatStarter - Error starting Tomcat context. Exception: org.springframework.beans.factory.BeanCreationException. Message: Error creating bean with name 'grailsCacheFilter': Cannot create inner bean '(inner bean)#5ec1152d' of type [grails.plugin.cache.web.filter.simple.MemoryPageFragmentCachingFilter] while setting bean property 'filter'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name '(inner bean)#5ec1152d': Unsatisfied dependency expressed through method 'setUrlMappingsHandlerMapping' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'urlMappingsHandlerMapping': Unsatisfied dependency expressed through method 'setWebRequestInterceptors' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'openSessionInViewInterceptor': Cannot resolve reference to bean 'hibernateDatastore' while setting bean property 'hibernateDatastore'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateDatastore': Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.grails.orm.hibernate.HibernateDatastore]: Constructor threw exception; nested exception is org.hibernate.MappingException: collection element mapping has wrong number of columns: com.grapevine.negotiator2.HouseInstance.features type: object

与目标虚拟机断开连接，地址：'127.0.0.1:57570'，传输：'socket'

ERROR org.springframework.boot.SpringApplication - Application      startup failed

Answer 1

据我所知，域名不支持@Delegate，您可以使用HouseInstance和HouseProto实施

的特征获得更多好运

使用@Delegate

1 个答案: