Django 错误：AttributeError at - 'Manager' 对象没有属性 'META'

Question

我正在使用 django 1.4 和 python 2.7

我正在尝试从 MySQL 数据库中获取数据... 视图.py：

def myRequests(request):
    #request = ProjectRequest.objects
    response = render_to_response('myRequests.html', {'ProjectRequest': request}, context_instance = RequestContext(request))
    return response

一旦我取消注释“request = ProjectRequest.objects”，我就会收到错误：

AttributeError at /myRequests/
'Manager' object has no attribute 'META'

我没有定义任何新的用户模型，所以这个错误对我来说毫无意义。 异常位置：

/{path}/lib/python2.7/site-packages/django/core/context_processors.py in debug, line 35

modelsRequest.py：

class ProjectRequest(Model):
    reqType = CharField("Request Type", max_length = MAX_CHAR_LENGTH)
    reqID = IntegerField("Request ID", primary_key = True)
    ownerID = IntegerField("Owner ID")
    projCodeName = CharField("Project Code Name", max_length = MAX_CHAR_LENGTH)
    projPhase = CharField("Project Phase", max_length = MAX_CHAR_LENGTH)
    projType = CharField("Project Phase", max_length = MAX_CHAR_LENGTH)
    projNotes = CharField("Project Notes", max_length = MAX_CHAR_LENGTH)
    contacts = CharField("Project Notes", max_length = MAX_CHAR_LENGTH)
    reqStatus = CharField("Status", max_length = MAX_CHAR_LENGTH)
    reqPriority = CharField("Request Priority", max_length = MAX_CHAR_LENGTH)
    reqEstDate = DateTimeField("Request Estimated Complete Date", auto_now_add = True)
    lastSaved = DateTimeField("Last saved", auto_now = True)
    created = DateTimeField("Created", auto_now_add = True)

    def __unicode__(self):
        return str(self.reqID) + ": " + str(self.reqType)

    class Meta:
        app_label = 'djangoTestApp'
        db_table = 'requests'

知道发生了什么吗？！

Answer 1

使用不同的变量名

project_request = ProjectRequest.objects

问题是因为这个context_instance = RequestContext(request)

它丢失了request 对象的上下文，因为它已被覆盖。因此问题。

def myRequests(request):
    project_request = ProjectRequest.objects
    #Now you have access to request object, 
    # do whatever you want with project_request - 
    response = render_to_response('myRequests.html', {'ProjectRequest': project_request}, context_instance = RequestContext(request))
    return response

您收到错误'Manager' object has no attribute 'META' 的原因是，当您这样做时

ProjectRequest.objects

模型ProjectRequest 的默认管理器（objects）分配给（覆盖的）局部变量request。