grails - Grails / GORM中的错误：已删除的对象将通过级联重新保存

之前看起来好像很多次，我已经看过其中的几个，包括Peter Ledbrook的“GORM Gotchas (Part 2)”，但在我的案例中似乎仍然无法解决。我的user有projects个project，而user属于skill。然后有一个projects与project相关联，但skill不属于project。当我尝试从user中移除foundUser.removeFromProjects(foundProject1)时，我收到了该错误。域类如下：


    package grailstuts

    class User {
        String name

        static constraints = { name(nullable: true) }

        static mapping = { projects cascade: "all-delete-orphan" }

        static hasMany = [ projects: Project ]
    }


    package grailstuts

    class Project {
        String title

        static constraints = { title(nullable: true) }

        static belongsTo = [ user: User ]
    }


    package grailstuts

    class Skill {
        String name

        static constraints = { name(nullable: true) }

        static mapping = { projects cascade: "all-delete-orphan" }

        static hasMany = [ projects: Project ]
    }

当我按如下方式运行集成测试时，包含given:... when:... then:...的部分似乎有问题。


    package grailstuts

    import spock.lang.*

    class SkillIntegrationSpec extends Specification {
        void "adding and deleting projects"() {
            given: "A user, and projects added to the user"
            def user = new User().save(failOnError: true)
            def project1 = new Project(title: "java, groovy")
            def project2 = new Project(title: "java, scala")
            user.addToProjects(project1)
            user.addToProjects(project2)

            when: "Projects are also added to skill entry"
            def java = new Skill(name: 'java').save(failOnError: true)
            java.addToProjects(project1)
            java.addToProjects(project2)
            def groovy = new Skill(name: 'groovy').save(failOnError: true)
            groovy.addToProjects(project1)
            def scala = new Skill(name: 'scala').save(failOnError: true)
            scala.addToProjects(project2)

            then: "Each skill entry has its corresponding projects"
            Skill.findByName("java").projects.size() == 2
            Skill.findByName("groovy").projects.size() == 1
            Skill.findByName("scala").projects.size() == 1

            when: "Some projects are deleted from the database"
            def foundUser = User.get(user.id)
            def foundProject1 = Project.findByTitle("java, groovy")
            foundUser.removeFromProjects(foundProject1)

            then: "The deleted projects are also reflected in the skill entry"
            Skill.findByName("java").projects.size() == 1
            Skill.findByName("groovy").projects.size() == 0
            Skill.findByName("scala").projects.size() == 1
        }
    }

上述测试中的第一个when:...块验证正常。在我尝试从project中删除user时，在第二个{{1}}块中，即错误似乎发生的时间。错误看起来像这样......


    | Running 1 integration test... 1 of 1
    | Failure:  adding and deleting projects(grailstuts.SkillIntegrationSpec)
    |  org.springframework.dao.InvalidDataAccessApiUsageException: deleted object would be re-saved by cascade (remove deleted object from associations): [grailstuts.Project#2]; nested exception is org.hibernate.ObjectDeletedException: deleted object would be re-saved by cascade (remove deleted object from associations): [grailstuts.Project#2]
        at org.grails.datastore.gorm.GormStaticApi.methodMissing_closure2(GormStaticApi.groovy:102)
        at grailstuts.SkillIntegrationSpec.adding and deleting projects(SkillIntegrationSpec.groovy:34)
    Caused by: org.hibernate.ObjectDeletedException: deleted object would be re-saved by cascade (remove deleted object from associations): [grailstuts.Project#2]
        ... 2 more
    | Completed 1 integration test, 1 failed in 0m 0s
    | Tests FAILED  - view reports in C:\Grails\grailstuts\target\test-reports

我正在使用：


    Grails version: 2.3.1
    Groovy version: 2.1.8
    JVM version: 1.7.0_45

花了不少时间挖掘一些解决方案，但还没有运气。任何帮助将受到高度赞赏。谢谢！

Grails / GORM中的错误：已删除的对象将通过级联重新保存

1 个答案: