期望从 Django RestFramework 中的视图返回一个 `Response`、`HttpResponse` 或 `HttpStreamingResponse`答案

【问题标题】：Expected a `Response`, `HttpResponse` or `HttpStreamingResponse` to be returned from the view in Django RestFramework期望从 Django RestFramework 中的视图返回一个 `Response`、`HttpResponse` 或 `HttpStreamingResponse`
【发布时间】：2022-02-17 22:48:02
【问题描述】：

我试图在循环执行后返回一个响应，但我收到一个错误

AssertionError at Data/CurrentRunningActivityForAudit/10 
Expected a `Response`, `HttpResponse` or `HttpStreamingResponse` to be returned from the view, but received a `<class 'NoneType'>`

当我在循环外添加另一个返回响应时，它会显示空数组，即 [ ] 它返回的是空响应

views.py：

def CurrentRunningActivity(UserID):
        cursor = connection.cursor()
        cursor.execute('EXEC [dbo].[sp_GetCurrentRunningActivityAudit] @UserId=%s',(UserID,))
        result_set = cursor.fetchall()

        IsActive = 'true'
     
        for row in result_set:
         data = []
         data.append({
            'TaskId':row[0],           
            'TaskName' : row[1],
            'Source' : row[2],
            'Requester' : row[3],
            'type' : row[4],
            'IsActive':IsActive,

         })
           
        
         return Response(data[0], status=status.HTTP_200_OK)

当我将返回响应移到循环之外时，它显示为local variable 'data' referenced before assignment

【问题讨论】：

您的响应在您的循环中。如果result_set 为空，则不会触发循环。则不会触发任何响应。

标签： django django-rest-framework

【解决方案1】：

试试这个：

def CurrentRunningActivity(UserID):
    cursor = connection.cursor()
    cursor.execute('EXEC [dbo].[sp_GetCurrentRunningActivityAudit] @UserId=%s',(UserID,))
    result_set = cursor.fetchall()

    IsActive = 'true'
    data = []
    for row in result_set:
        data.append({
            'TaskId': row[0],           
            'TaskName' : row[1],
            'Source' : row[2],
            'Requester' : row[3],
            'type' : row[4],
            'IsActive': IsActive,
         })

    return Response(
        data[0] if data else [],
        status=status.HTTP_200_OK
    )

【讨论】：

【解决方案2】：

你必须像这样改变你的代码

def CurrentRunningActivity(UserID):
    cursor = connection.cursor()
    cursor.execute('EXEC [dbo].[sp_GetCurrentRunningActivityAudit] @UserId=%s',(UserID,))
    result_set = cursor.fetchall()

    IsActive = 'true'
    data = [] # changed
    for row in result_set:
        data.append({
          'TaskId':row[0],           
          'TaskName' : row[1],
          'Source' : row[2],
          'Requester' : row[3],
          'type' : row[4],
          'IsActive':IsActive,

        })
           
        
     return Response(data[0], status=status.HTTP_200_OK)

【讨论】：