为什么我的Django form is_valid（）返回false？

Question

我有点卡住了。有人可以告诉我为什么is_valid()函数返回false并且在屏幕上也没有显示错误？我尽可能简化了我的视图，无论我使用何种数据填充表单，HttpResponseRedirect总是重定向到/information。

forms.py

class FantasySeasonForm(ModelForm): 
    class Meta: 
     model = FantasyTeam 

    def __init__(self,*args,**kwargs): 
     super(FantasySeasonForm,self).__init__(**kwargs) 
     #filter all players to only premier league players 
     self.fields['player1'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player2'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player3'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player4'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player5'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player6'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player7'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player8'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player9'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player10'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player11'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player12'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player13'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player14'].queryset = Player.objects.filter(team__competition__pk=2) 
     self.fields['player15'].queryset = Player.objects.filter(team__competition__pk=2) 

views.py

@login_required 
def entry(request):  
    fantasyTeamForm = FantasySeasonForm() #Form to store each player in the fantasy team 
    seasonUserTournForm = PartialSeasonEntryForm() 

    # If the form has been submitted... 
    if request.method == 'POST': 
     fantasyTeamForm = FantasySeasonForm(request.POST or None) # A form bound to the POST data 

     if fantasyTeamForm.is_valid():      
      return HttpResponseRedirect('/season/entrysuccess') #page on success 

     else: 
      return HttpResponseRedirect('/information') #page on error 

    #OTHERWISE A GET REQUEST 
    args = {} 
    args.update(csrf(request)) 

    args['form'] = fantasyTeamForm 
    args['form2'] = seasonUserTournForm 

    return render_to_response('entry.html', args, context_instance=RequestContext(request)) 

entry.html

<h2><b>Choose your team:</b></h2><br> 

    {% for field in form %} 
     {{field.error}} 
    {% endfor %} 
    {% for field in form2 %} 
     {{field.error}} 
    {% endfor %} 

    <form action="/season/entry/" method="post"> {% csrf_token %} 
     {{form2}} 
     <br><br> 
     {{form.as_ul}} 
     <br> 
     <input type="submit" value="Submit Team" />   
    </form> 

更新

为球队名称和球员选择1-7值后，留下其余的空白我已经印在了else语句下面的值..

form.is_bound回报True

form.errors回报

<ul class="errorlist"><li>player9<ul class="errorlist"><li>This field is required.</li></ul></li><li>player4<ul class="errorlist"><li>This field is required.</li></ul></li><li>player8<ul class="errorlist"><li>This field is required.</li></ul></li><li>player11<ul class="errorlist"><li>This field is required.</li></ul></li><li>player10<ul class="errorlist"><li>This field is required.</li></ul></li><li>player5<ul class="errorlist"><li>This field is required.</li></ul></li><li>player14<ul class="errorlist"><li>This field is required.</li></ul></li><li>player6<ul class="errorlist"><li>This field is required.</li></ul></li><li>player13<ul class="errorlist"><li>This field is required.</li></ul></li><li>player3<ul class="errorlist"><li>This field is required.</li></ul></li><li>player12<ul class="errorlist"><li>This field is required.</li></ul></li><li>player15<ul class="errorlist"><li>This field is required.</li></ul></li><li>player7<ul class="errorlist"><li>This field is required.</li></ul></li></ul>

form.data回报

<QueryDict: {'player14': [''], 'player9': [''], 'player4': ['3897'], 'team_name': ['Just Amazing'], 'player8': [''], 'player11': [''], 'player10': [''], 'player5': ['3897'], 'player1': ['1934'], 'player12': [''], 'player6': ['13017'], 'player13': [''], 'player2': ['1934'], 'player3': ['3897'], 'csrfmiddlewaretoken': ['H8dIdnepxSgEduPCT6Yiy9iYsLmXqwJy'], 'player15': [''], 'player7': ['13017']}>

Answer 1

构建表单时，您应该通过*args和**kwargs。

def __init__(self, *args, **kwargs): 
    super(FantasySeasonForm,self).__init__(*args, **kwargs) 
    ... 

通过错过了*args，当前的代码有，如果你做了fantasyTeamForm = FantasySeasonForm(data=None)同样的效果。即使没有错误，is_valid()也会返回False，因为表单没有绑定到任何数据。

顺便说一句，你可以遍历玩家区域，以避免重复：

for player_id in xrange(1, 16) 
    field_name = "player%d" % player_id 
    self.fields[field_name].queryset = Player.objects.filter(team__competition__pk=2)