Grails/GORM:org.hibernate.AssertionFailure:xyz中的null id（发生异常后不要刷新会话）

我有一个grails/jaxrs应用程序无法自动持久化嵌套对象图，我想知道我是否可以通过数据模型来实现它

资源正确地反序列化对象，然后将保存父对象（Tautor），但无法自动保存子对象（Tooks）。子项具有空ID，以及对父项的空引用

我可以手动创建子对象，但我正在寻找更好的方法来管理它

域类

class Tauthor {

    String nameShort
    Integer age

    static hasMany = [tooks:Took]

}

class Took {

    String title;

    static belongsTo = [tauthor:Tauthor]
}

资源

@Consumes([MediaType.APPLICATION_JSON, "application/json"])
@Produces([MediaType.APPLICATION_JSON, "application/json"])
@Path('/api/tauthor')
class TauthorResource {

    TauthorService tauthorService

    @POST
    Tauthor create(Tauthor dto) {
      Tauthor created = tauthorService.save(dto)
      if(!created.hasErrors()) {
        return created
      }
    }
}

class TauthorService {

    Tauthor save(Tauthor dto) {
        dto.validate()

        if (dto.hasErrors()) {
            return dto
        }

        return dto.save()
    }
}

class TauthorService {

    Tauthor save(Tauthor dto) {
        dto.validate()

        if (dto.hasErrors()) {
            return dto
        }

        // remove tooks, and create them separately
        Set<Took> tooks = []
        tooks += dto.tooks

        tooks.each { took ->
            dto.removeFromTooks(took)
        }

        Tauthor created = dto.save()

        // readd tooks to tauthors
        tooks.each { took->
            took.tauthor = created
            took.save()
        }

        tooks.each { took->
            created.addToTooks(took)
        }
        created.save()

        return created

    }
}

需要但中断的服务

@Consumes([MediaType.APPLICATION_JSON, "application/json"])
@Produces([MediaType.APPLICATION_JSON, "application/json"])
@Path('/api/tauthor')
class TauthorResource {

    TauthorService tauthorService

    @POST
    Tauthor create(Tauthor dto) {
      Tauthor created = tauthorService.save(dto)
      if(!created.hasErrors()) {
        return created
      }
    }
}

class TauthorService {

    Tauthor save(Tauthor dto) {
        dto.validate()

        if (dto.hasErrors()) {
            return dto
        }

        return dto.save()
    }
}

class TauthorService {

    Tauthor save(Tauthor dto) {
        dto.validate()

        if (dto.hasErrors()) {
            return dto
        }

        // remove tooks, and create them separately
        Set<Took> tooks = []
        tooks += dto.tooks

        tooks.each { took ->
            dto.removeFromTooks(took)
        }

        Tauthor created = dto.save()

        // readd tooks to tauthors
        tooks.each { took->
            took.tauthor = created
            took.save()
        }

        tooks.each { took->
            created.addToTooks(took)
        }
        created.save()

        return created

    }
}

工作服务

@Consumes([MediaType.APPLICATION_JSON, "application/json"])
@Produces([MediaType.APPLICATION_JSON, "application/json"])
@Path('/api/tauthor')
class TauthorResource {

    TauthorService tauthorService

    @POST
    Tauthor create(Tauthor dto) {
      Tauthor created = tauthorService.save(dto)
      if(!created.hasErrors()) {
        return created
      }
    }
}

class TauthorService {

    Tauthor save(Tauthor dto) {
        dto.validate()

        if (dto.hasErrors()) {
            return dto
        }

        return dto.save()
    }
}

class TauthorService {

    Tauthor save(Tauthor dto) {
        dto.validate()

        if (dto.hasErrors()) {
            return dto
        }

        // remove tooks, and create them separately
        Set<Took> tooks = []
        tooks += dto.tooks

        tooks.each { took ->
            dto.removeFromTooks(took)
        }

        Tauthor created = dto.save()

        // readd tooks to tauthors
        tooks.each { took->
            took.tauthor = created
            took.save()
        }

        tooks.each { took->
            created.addToTooks(took)
        }
        created.save()

        return created

    }
}