Django窗体添加项目返回'NoneType'对象不可调用错误

Question

我的add_player视图需要一个team_season_id参数并显示一个未绑定的窗体。

def add_player(request, team_season_id): 
    team_season = get_object_or_404(TeamSeasonConference, pk=team_season_id) 

    player_form = PlayerForm() 
    return render_to_response('backoffice/organization/add_player.html', { 
     'player_form': player_form, 
     'team_season': team_season, 
     'player': None 
    }, context_instance=RequestContext(request)) 

这里的回溯：

Traceback: 
File "/usr/lib/pymodules/python2.6/django/core/handlers/base.py" in get_response 
    92.     response = callback(request, *callback_args, **callback_kwargs) 
File "/mypath/apps/account/decorators.py" in __call__ 
    73.    return self.view_func(request, *args, **kwargs) 
File "/mypath/apps/backoffice/views.py" in add_player 
    877.  player_form = PlayerForm() 
File "/usr/lib/pymodules/python2.6/django/forms/models.py" in __init__ 
    218.    self.instance = opts.model() 

Exception Type: TypeError at /backoffice/roster/add/player/2/ 
Exception Value: 'NoneType' object is not callable 

这里的PlayerForm：

class PlayerForm(forms.ModelForm): 
    CLASS_CHOICES = (
     ('', '-----'), 
    ('FR', 'freshman'), 
    ('RS-FR', 'red-shirt freshman'), 
    ('SO', 'sophomore'), 
    ('RS-SO', 'red-shirt sophomore'), 
    ('JR', 'junior'), 
    ('RS-JR', 'red-shirt junior'), 
    ('SR', 'senior'), 
    ('RS-SR', 'red-shirt senior'), 
) 

first_name = forms.CharField(max_length=100, required=False, label="First") 
last_name = forms.CharField(max_length=100, label="Last") 

jersey = forms.IntegerField(min_value=0, required=False, label="Jersey") 
height = forms.CharField(max_length=10, required=False) 
weight = forms.IntegerField(required=False, min_value=0) 
age = forms.IntegerField(required=False, min_value=0) 
year = forms.TypedChoiceField(choices=CLASS_CHOICES, required=False, empty_value='') 
varsity_letters = forms.IntegerField(required=False, min_value=0) 
position = forms.CharField(max_length=20, required=False) 
hometown = forms.CharField(required=False) 
major = forms.CharField(max_length=100, required=False) 
freeform_school = forms.CharField(required=False, label="HS") 
description = forms.CharField (widget=forms.Textarea, required=False) 
HSSN = forms.CharField(max_length=8, required=False) 
mugshot = forms.FileField(widget=forms.FileInput(), required=False) 
team_season_connection = forms.ModelMultipleChoiceField(queryset=TeamSeasonConference.objects.filter(team = 1), required=False, widget=forms.SelectMultiple) 

    def save(self, commit=True, request=None, user=None): 
     player = super(PlayerForm, self).save(commit=False) 

     if commit: 
      # save the player 
      player.save() 
      return player 

这里的球员模型

class Player(models.Model): 

CLASS_CHOICES = (
    ('FR', 'freshman'), 
    ('RS-FR', 'red-shirt freshman'), 
    ('SO', 'sophomore'), 
    ('RS-SO', 'red-shirt sophomore'), 
    ('JR', 'junior'), 
    ('RS-JR', 'red-shirt junior'), 
    ('SR', 'senior'), 
    ('RS-SR', 'red-shirt senior'), 
) 

first_name = models.CharField(max_length=100) 
last_name = models.CharField(max_length=100) 
suffix = models.CharField(max_length=5, blank=True) 
nickname = models.CharField(max_length=100, blank=True) 
slug = models.SlugField(max_length=200, blank=True, help_text="Used for associating content. (lowercase, hyphens sted spaces, no punctuation)") 

team_season_connection = models.ManyToManyField(TeamSeasonConference, related_name='career_roster', blank=True) 
team_season = models.ForeignKey(TeamSeasonConference, related_name='roster', blank=True) 
height = models.CharField(max_length=10, blank=True) 
weight = models.PositiveIntegerField(blank=True, null=True) 
age = models.PositiveIntegerField(blank=True, null=True) 
year = models.CharField(max_length=5, choices=CLASS_CHOICES, blank=True, db_index=True) 
varsity_letters = models.PositiveIntegerField(blank=True, null=True) 
position = models.CharField(max_length=20, blank=True) 
jersey = models.PositiveIntegerField(blank=True, null=True) 
mugshot = models.ForeignKey('content.Photo', null=True, blank=True) 
profile = models.ForeignKey('content.Story', null=True, blank=True, help_text="Optionally link player to a profile story.") 

major = models.CharField(max_length=100, blank=True) 

freeform_school = models.CharField(max_length=100, blank=True, help_text="Take care to enter the school consistantly across players.") 
hometown = models.CharField(max_length=100, blank=True, help_text="Town and state, i.e. Orlando, FL.") 
offered_scholarship = models.BooleanField(help_text="Check if user has a scholarship offer.") 
description = models.TextField(blank=True) 

antagonist = models.BooleanField(help_text="To be used as indicator of whether this player is the season's antagonist") 
pluck_user = models.ForeignKey ('auth.User', null=True, blank=True, help_text="Optionally link to user login") 

# reverse generic relations 
scrapbooks = generic.GenericRelation(Scrapbook) 

Answer 1

您使用ModelForm无关联模型它。与model属性创建一个内部Meta类，如per documentation：

class PlayerForm(forms.ModelForm): 
    class Meta: 
     model = models.Player # or whatever 

另外，不要忽略save如果你并不真的需要它。