Django表單驗證問題

Question

我有一個似乎永遠不會驗證的表單。該表格只是三個下拉框。當表單呈現時，所有框都填充了值，第一個被選中，所以無論如何，用戶都不能提交錯誤的值，但form.is_valid（）總是返回false。請幫忙！

形式

CLUSTER_TYPES = (
    ('ST', 'State'), 
    ('CNT', 'County'), 
    ('FCD', 'Congressional District'), 
    ('GCC', 'Circle Clustering'), 
); 

MAP_VIEWS = (
    ('1', 'Single Map'), 
    ('2', 'Two Maps'), 
    ('4', 'Four Maps'), 
); 
class ViewDataForm (forms.Form): 
    def __init__ (self, sets = None, *args, **kwargs): 
     sets = kwargs.pop ('data_sets') 
     super (ViewDataForm, self).__init__ (*args, **kwargs) 

     processed_sets = [] 
     for ds in sets: 
      processed_sets.append ((ds.id, ds.name)) 

     self.fields['data_sets'] = forms.ChoiceField (label='Data Set', choices = processed_sets) 
     self.fields['clustering'] = forms.ChoiceField (label = 'Clustering', 
                 choices = CLUSTER_TYPES) 
     self.fields['map_view'] = forms.ChoiceField (label = 'Map View', choices = MAP_VIEWS) 

您已覆蓋窗體的__init__方法的簽名，使得第一位置參數是sets視圖

def main_view (request): 
    # We will get a list of the data sets for this user 
    sets = DataSet.objects.filter (owner = request.user) 

    # Create the GeoJSON string object to potentially populate 
    json = '' 

    # Get a default map view 
    mapView = MapView.objects.filter (state = 'Ohio', mapCount = 1) 
    mapView = mapView[0] 

    # Act based on the request type 
    if request.method == 'POST': 
     form = ViewDataForm (request.POST, request.FILES, data_sets = sets) 
      v = form.is_valid() 
     if form.is_valid(): 
      # Get the data set 
      ds = DataSet.objects.filter (id = int (form.cleaned_data['data_set'])) 
      ds = ds[0] 

      # Get the county data point classifications 
      qs_county = DataPointClassification.objects.filter (dataset = ds, 
                   division = form.cleaned_data['clustering']) 

      # Build the GeoJSON object (a feature collection) 
      json = '' 
      json += '{"type": "FeatureCollection", "features": [' 
      index = 0 
      for county in qs_county: 
       if index > 0: 
        json += ',' 
       json += '{"type": "feature", "geometry" : ' 
       json += county.boundary.geom_poly.geojson 
       json += ', "properties": {"aggData": "' + str (county.aggData) + '"}' 
       json += '}' 
       index += 1 
      json += ']}' 

      mapView = MapView.objects.filter (state = 'Ohio', mapCount = 1) 
      mapView = mv[0] 
    else: 
     form = ViewDataForm (data_sets = sets) 

    # Render the response 
    c = RequestContext (request, 
         { 
          'form': form, 
          'mapView_longitude': mapView.centerLongitude, 
          'mapView_latitude': mapView.centerLatitude, 
          'mapView_zoomLevel': mapView.zoomLevel, 
          'geojson': json, 
          'valid_was_it': v 
         }) 
    return render_to_response ('main.html', c) 

Answer 1

。然而，當你實例化它時，你通過request.POST作爲第一個位置參數 - 所以表單從不獲取任何數據，所以不驗證。

請勿更改__init__的簽名。事實上，你已經正確設置了所有東西，所以你不需要：只需從方法定義中刪除sets=None，它應該都可以工作。