Grails的错误“违反了外键约束”不能试图在同一时间

Question

我试图挽救它被映射喜欢 -

class Order { 
    String prefix 
    Long orderNumber 
    Date date 
    Incident incident 
    //..... few more variables 
} 

class Incident { 
    Double amountToCharge 
    String description 
    Boolean isCharged = false 
    Order order 
    //..... few more variables 
} 

现在域类对象保存多个对象时，我试图添加一个对象将它们保存我的服务类中我做了以下事项

def save(Order orderInstance, params){ 
    orderInstance.withTransaction { status -> 

      if (orderInstance.save()) { 

      if(params.isIncident){ 
       def incidentStatus = saveIncident(params, orderInstance) 

       if(incidentStatus.result == true){ 
        println "-----------------Incident Saved" 
       }else{ 
        status.setRollbackOnly() 
        result["result"] = false 
        result["message"] = "Could not save. Please try again." 
        return result 
       } 
      } 

      result["result"] = true 

      return result 
     } else { 

      for (fieldErrors in orderInstance.errors) { 
       for (error in fieldErrors.allErrors) { 
        result["message"] = messageSource.getMessage(error, locale) 
       } 
      } 
      return result 
     } 
    } 
} 

def saveIncident(params, Order orderInstance){ 
    def result = [:] 

    def paramsMap = [:] 
    paramsMap.description = params.incident.description 
    paramsMap.amountToCharge = params.incident.amountToCharge 
    paramsMap.isCharged = params.incident.isCharged ? false : true 
    paramsMap.order = mROrderInstance 

    def incidentInstance = new Incident(paramsMap) 
    println "-----Done till here. Next line throws error----" 
    if (incidentInstance.save(flush:true)){ 
     orderInstance.incident = incidentInstance 

     result["result"] = true 
    }else{ 
     result["result"] = false 

     for (fieldErrors in incidentInstance.errors) { 
      for (error in fieldErrors.allErrors) { 
       println messageSource.getMessage(error, locale) 
       result["message"] = messageSource.getMessage(error, locale) 
      } 
     } 
    } 
    return result 
} 

它给了我下面的错误 -

ERROR: insert or update on table "order" violates foreign key  constraint "fk_a0y0jvv0o9nhkafuj7g7iknc6" 
Detail: Key (incident_id)=(2) is not present in table "incident".. Stacktrace follows: 
Message: ERROR: insert or update on table "order" violates foreign key constraint "fk_a0y0jvv0o9nhkafuj7g7iknc6" 
Detail: Key (incident_id)=(2) is not present in table "incident". 
Line | Method 
->> 2102 | receiveErrorResponse in org.postgresql.core.v3.QueryExecutorImpl 
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
| 1835 | processResults  in  '' 
| 257 | execute . . . . . . in  '' 
| 500 | execute    in org.postgresql.jdbc2.AbstractJdbc2Statement 
| 388 | executeWithFlags . . in  '' 
| 334 | executeUpdate  in  '' 
| 124 | $tt__saveIncident . in com.xyz.fleet.db.OrderService$$EPZ0qsAS 
|  46 | doCall    in com.xyz.fleet.db.OrderService$_$tt__save_closure6$$EPZ0qsAS 
| 815 | withTransaction . . in org.grails.datastore.gorm.GormStaticApi 
| 715 | withTransaction  in  '' 
|  41 | $tt__save . . . . . in com.xyz.fleet.db.MROrderService$$EPZ0qsAS 
|  32 | $tt__save   in com.xyz.fleet.db.MROrderController 
| 198 | doFilter . . . . . . in grails.plugin.cache.web.filter.PageFragmentCachingFilter 
|  63 | doFilter    in grails.plugin.cache.web.filter.AbstractFilter 
|  53 | doFilter . . . . . . in grails.plugin.springsecurity.web.filter.GrailsAnonymousAuthenticationFilter 
|  49 | doFilter    in grails.plugin.springsecurity.web.authentication.RequestHolderAuthenticationFilter 
|  82 | doFilter . . . . . . in grails.plugin.springsecurity.web.authentication.logout.MutableLogoutFilter 
|  46 | doFilterInternal  in org.grails.jaxrs.web.JaxrsFilter 
| 1142 | runWorker . . . . . in java.util.concurrent.ThreadPoolExecutor 
| 617 | run     in java.util.concurrent.ThreadPoolExecutor$Worker 
^ 745 | run . . . . . . . . in java.lang.Thread 

当我刷新会话时出现错误。即使我不那么每当它自动刷新然后它会抛出同样的错误。

注意：如果我没有手动刷新会话，则会保存Incident，该方法返回保存Order。它也可以保存。 Incident对象附加到订购对象，我可以使用println 查询但最后它会自动清除会话，然后抛出上面显示的错误。

所以最后谁能告诉我这里有什么问题？

Answer 1

最有可能的问题是，Order.incident不可为空（默认值），你想保存为了不保存它的Incident第一。

def order = ... 
def incident = ... 

if(incident.save()) { 
    order.incident = incident 
    order.save() 
} 

如果Incident一个实例只能属于一个Order，尝试添加belongsTo：

class Incident { 
    Double amountToCharge 
    String description 
    Boolean isCharged = false 
    Order order 
    //..... few more variables 

    static belongsTo = [order: Order] 
} 

双向许多-to-one关联简化节能实例。

def order = ... 
def incident = ... 

order.incident = incident 
order.save() 

双向许多-to-one关联导致Order和Incident得到保存在一起。