Question

所以我有一个问题。我有一个模型表单：

class TeamForm(forms.ModelForm):

class Meta:
    model = Team
    fields = ['name','category','association','division','gender','logo','season']

def __init__(self, *args, **kwargs):
    self.user = kwargs.pop('user')
    super(TeamForm, self).__init__(*args, **kwargs)
    instance = getattr(self, 'instance', None)

    utils = CPUtils()
    season_utils = SeasonUtils()

    if instance and instance.pk is None:
        self.fields['division'].initial = 1
        self.fields['season'].initial = season_utils.getCurrentSeason().id

        if user_role != 'admin':
            self.fields['division'].widget.attrs['disabled'] = True
            self.fields['division'].required = False

            self.fields['season'].widget.attrs['disabled'] = True
            self.fields['season'].required = False

所以我正在为场地赛季设定表格的首字母。在我的表格上，它显示得很好。

所以现在在我的干净方法中，我想运行一些验证，我需要获得实例季节。

用我干净的方法：

    if cleaned_data.get('season') is None:
        cleaned_data['season'] = self.instance.season

但它说self.instance.season：DoesNotExist：团队没有季节。

我一直试图弄清楚这一段时间，我不知道发生了什么......

编辑：这是我的模特：

name = models.CharField(max_length=25,verbose_name=_("name"))
slug = AutoSlugField(unique=True,populate_from='name')
season = models.ForeignKey(Season,verbose_name=_("season"),blank=False)
association = models.ForeignKey(Association,blank=False,null=True,verbose_name=_("association"),on_delete=models.SET_NULL)
category = models.ForeignKey(Category,verbose_name=_("category"),blank=False,null=True,default=1,on_delete=models.SET_NULL)
division = models.ForeignKey(Division,verbose_name=_("division"),blank=False,null=True,default=1,on_delete=models.SET_NULL)

此外，该实例仅在创建期间没有季节，而不是在更新期间......

谢谢， ARA

Answer 1

它说的原因：

self.instance.season：DoesNotExist

您是否正在访问self。 Self这里实际上是表单，您要求表单查找名为instance的属性，然后询问instance属性，如果它具有season属性。表单没有此属性。

您真正想要做的是根据季节ID获取Model实例，而不是Form实例。在您使用模型将数据保存到数据库之前，Form实例仅在您清理数据时暂时保存数据。

如果您尝试clean()本赛季，那么如果您的表单中Season为ID，则您希望以这种方式访问它：

class TeamForm(forms.ModelForm): 

    # form logic here

    def clean(self):
        cleaned_data = super(TeamForm, self).clean()

        # now get the Season Object from the cleaned_data dictionary 
        #   if 'season' == season_id
        try:
            season_id = cleaned_data['season']
            season = Season.object.get(pk=season_id)
        except KeyError:
            # season id does not exist, so do something here
            pass

Django表单实例缺少一个字段

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