Question

我将项目设置如下。我想删除一个项目，我得到以下内容：

2010-09-29 11:45:22,902 [http-8080-1] ERROR errors.GrailsExceptionResolver  - deleted object would be re-saved by cascade (remove deleted object from associatio
ns): [Project#204]
org.hibernate.ObjectDeletedException: deleted object would be re-saved by cascade (remove deleted object from associations): [Project#204]
        at ProjectController$_closure6.doCall(ProjectController:50)
        at ProjectController$_closure6.doCall(ProjectController)
        at org.jsecurity.web.servlet.JSecurityFilter.doFilterInternal(JSecurityFilter.java:382)
        at org.jsecurity.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:180)
        at java.lang.Thread.run(Thread.java:619)

有没有办法让hibernate告诉我哪个对象有引用回到将被重新保存的Project对象。我的项目设置导致了这个循环异常有什么问题？

public class Project implements Comparable
{  
    static belongsTo = [employee:Employee]

    static hasMany = [roles:Role]
    static constraints = {

    }
    static mapping = {
          description type:"text"
          roles lazy:false, cascade:"all,delete-orphan"
          client lazy:false, cascade:"all,delete-orphan"
          employer lazy:false, cascade:"all,delete-orphan"
    }
}


class Employee implements Comparable
{
    static hasMany = [employeeDesiredSkills:EmployeeDesiredSkill,
                      employeeDesiredTools:EmployeeDesiredTool,
                      employeeAreasOfExpertise:EmployeeAreaOfExpertise,
                      projects:Project,
                      education:Education]


    static mapping = {
           employeeDesiredSkills cascade:"all,delete-orphan", lazy:false
           employeeDesiredTools cascade:"all,delete-orphan", lazy:false
           education cascade:"all,delete-orphan", lazy:false
           projects cascade:"all,delete-orphan", lazy:false
    }
}

public class Role implements Comparable
{

    static belongsTo = [project:Project]
    static hasMany = [roleSkills:RoleSkill,roleTools:RoleTool]

    static mapping = {
        duties type:"text"
        roleSkills cascade:"all,delete-orphan", lazy:false
        roleTools cascade:"all,delete-orphan", lazy:false
        locationType cascade:"all,delete-orphan", lazy:false

    }

    static contraints = {
        endDate(nullable: true)
        roleSkills(nullable: true)
        roleTools(nullable: true)
    }
}

class Employer implements Comparable
{
   static mapping = {
       type lazy:false, cascade:"all,delete-orphan"
   }
}

class RoleTool implements Comparable    
{


  static belongsTo = [role:Role, tool:Tool]//not sure this makes sense, but have to leave it or DB breaks
  Tool tool = new Tool(name:"")
    static mapping = {
      tool cascade:"save-update", lazy:false

    }


class RoleSkill implements Comparable   
{

  static belongsTo = [role:Role, skill:Skill]//not sure this makes sense, but have to leave it or DB breaks
    Skill skill = new Skill(name:"")
    static mapping = {
       skill cascade:"save-update", lazy:false

    }
}

class Skill implements Comparable
{
    static hasMany = [roleSkills:RoleSkill, employeeDesiredSkills:EmployeeDesiredSkill]

    static mapping = {
        roleSkills cascade:"all,delete-orphan", lazy:false
        employeeDesiredSkills cascade:"all,delete-orphan", lazy:false

    }

}

class Tool implements Comparable
{

    static hasMany = [roleTools:RoleTool, employeeDesiredTools:EmployeeDesiredTool]

    static mapping = {
        roleTools cascade:"all,delete-orphan", lazy:false
        employeeDesiredTools cascade:"all,delete-orphan", lazy:false

    }
}

Answer 1

事实上，你完成映射的方式 projects cascade:"all,delete-orphan" 在Employee类中。

你只需要这样做：

def employee = project.employee; 
employee.removeFromProjects(project);

该项目也将被删除。有关更多详细信息，请参阅GORM Gotchas By Peter Ledbrook。它是一个3部分系列，并解释了许多类似的情况

Answer 2

我知道已经晚了但有人可能想在这里找到这个：会发生什么是Hibernate使用'dirtyChecking'，如GORM Gotchas By Peter Ledbrook中所述。

简而言之： Hibernate，所以Grails希望在Hibernate会话结束时save() employee对象（在.delete(flush:true)调用的情况下），因为它检测到对象已被修改（ project被压制了。并且employee必须保留与project的链接，从而导致Hibernate感觉delete()再次project save()。

要解决此问题：

 def employee = project.employee; 
 employee.discard(); 
 project.delete(flush:true);

如果没有你的要求，这就告诉Hibernate不要save() employee。

Answer 3

如果你有删除设置的级联，就像你一样，你需要在删除它之前删除它的父对象。从第50行的ProcectController中的堆栈跟踪。

grails deleted对象将通过级联错误重新保存

3 个答案: