title: Django error 'ManagerDescriptor' object has no attribute 'filter'
body: <p>I am relatively new to django and am running into the error 'ManagerDescriptor' object has no attribute 'filter' when retrieving view 'dashboard' -- below is my view and model. Can anyone point me in the right direction here? Thanks!</p>
  
  <p><strong>#views.py</strong></p>
  
  <pre><code>def dashboard(request):
      tabledata_totals = ''
      if not request.user.is_authenticated:
          return redirect(settings.LOGIN_URL, request.path)
      else:
          orgs = Profile.objects.values_list('assigned_org_ids', 'view_group').get(user_id=request.user.id)
          tabledata_totals = org_totals.objects.filter(org_id__in=orgs[0].split(',')).aggregate(
              sum('open_supplement_count'),
              sum('open_estimate_count'),
              sum('open_measurement_count'),
              sum('total_open_count'),
              sum('supplement_sent_to_ins'),
              sum('revised_scope_received_additional_items_needed'),
              sum('homeowner_permission_needed'),
              sum('three_calls_to_adjuster_without_response'),
              sum('spoke_to_adjuster'),
              sum('missing_documents_required_for_supplementation'),
              sum('wWaiting_on_a_revised_scope'),
              sum('estimate_created_and_sent_to_customer'),
              sum('deal_in'),
              sum('supplement_complete'),
              sum('eagleview_measurements'),
              sum('confirmed_received'),
              sum('confirmed_assigned_to_adjuster'),
              sum('additional_documentation_needed')
              )
      return render(request, 'HTML/dashboard.html', {'data': tabledata_totals})
  </code></pre>
  
  <p><strong>#models.py</strong></p>
  
  <pre><code>@login_required(login_url='/login/')
  class org_totals(models.Model):
      organization = models.CharField(max_length=100, blank=True, null=True)
      org_id = models.SmallIntegerField(primary_key=True)
      open_supplement_count = models.SmallIntegerField(blank=True, null=True)
      open_estimate_count = models.SmallIntegerField(blank=True, null=True)
      open_measurement_count = models.SmallIntegerField(blank=True, null=True)
      total_open_count = models.SmallIntegerField(blank=True, null=True)
      Supplement_Sent_to_Ins = models.SmallIntegerField(blank=True, null=True)
      Revised_Scope_Received_Additional_Items_Needed = models.SmallIntegerField(blank=True, null=True)
      Homeowner_Permission_Needed = models.SmallIntegerField(blank=True, null=True)
      three_Calls_to_Adjuster_Without_Response = models.SmallIntegerField(blank=True, null=True)
      Spoke_to_Adjuster = models.SmallIntegerField(blank=True, null=True)
      Missing_Documents_Required_for_Supplementation = models.SmallIntegerField(blank=True, null=True)
      Waiting_on_a_Revised_Scope = models.SmallIntegerField(blank=True, null=True)
      Estimate_Created_and_Sent_to_Customer = models.SmallIntegerField(blank=True, null=True)
      Deal_In = models.SmallIntegerField(blank=True, null=True)
      Supplement_Complete = models.SmallIntegerField(blank=True, null=True)
      Eagleview_Measurements = models.SmallIntegerField(blank=True, null=True)
      Confirmed_Received = models.SmallIntegerField(blank=True, null=True)
      Confirmed_Assigned_to_Adjuster = models.SmallIntegerField(blank=True, null=True)
      Additional_Documentation_Needed = models.SmallIntegerField(blank=True, null=True)
  
      class Meta:
          managed = False
          db_table = 'org_open_totals'
  </code></pre>