Grails域控制器中的依赖项注入

我正在尝试创建一个自定义约束。我已将逻辑放在服务中：

class RegExpManagerService {

    boolean transactional = false
    def messageSource

    def lookupRegexp(regExpression,Locale locale) {

       def pattern = messageSource.getMessage( regExpression,null,locale )
       return pattern
    }

    def testRegexp(regExpression,text,Locale locale) {
       return text ==~ lookupRegexp(regExpression,locale)
    }
}

并尝试将其注入我的域控制器：

class Tag extends IbidemBaseDomain {

    def regExpManagerService
    static hasMany=[itemTags:ItemTag]
    static mapping = {
        itemTags fetch:"join"
    }

    //Long id
    Date dateCreated
    Date lastUpdated
    String tag
    // Relation
    Tagtype tagtype
    // Relation
    Customer customer
    // Relation
    Person updatedByPerson
    // Relation
    Person createdByPerson

    static constraints = {
        dateCreated(nullable: true)
        lastUpdated(nullable: true)
        tag(blank: false,validator: {val,obj ->
                regExpManagerService.testRegexp(obj.tagtype.regexpression,val,local)
        })
        tagtype(nullable: true)
        customer(nullable: true)
        updatedByPerson(nullable: true)
        createdByPerson(nullable: true)
    }
    String toString() {
        return "${tag}" 
    }
}

当执行约束时，我得到以下错误：

2009-08-24 18:50:53,562 [http-8080-1] ERROR errors.GrailsExceptionResolver  - groovy.lang.MissingPropertyException: No such property: regExpManagerService for class: org.maflt.ibidem.Tag
org.codehaus.groovy.runtime.InvokerInvocationException: groovy.lang.MissingPropertyException: No such property: regExpManagerService for class: org.maflt.ibidem.Tag

---

约束闭包是静态的，因此它无法看到实例字段“regExpManagerService”。但是您有正在验证的对象，因此您可以从以下位置访问它：

   tag(blank: false,validator: {val,obj ->
      obj.regExpManagerService.testRegexp(obj.tagtype.regexpression,val,local)
   })