[英]Django self.cleaned_data Keyerror
我正在寫一個Django網站,我正在編寫自己的表單驗證:
class CreateJobOpportunityForm(forms.Form):
subject = forms.CharField(max_length=30)
start_date = forms.DateField(widget=SelectDateWidget)
end_date = forms.DateField(widget=SelectDateWidget)
def clean_start_date(self):
start_date = self.cleaned_data['start_date']
end_date = self.cleaned_data['end_date']
if start_date > end_date :
raise forms.ValidationError("Start date should be before end date.")
return start_date
但是當start_date小於end_date時,它會說:
KeyError at /create_job_opportunity
'end_date'
為什么不識別'end_date'
鍵?
由於一個字段依賴於另一個字段,因此最好使用表單的clean
方法進行clean
,而不是使用單獨的clean_field
方法。
def clean(self):
cleaned_data = super(CreateJobOpportunityForm, self).clean()
end_date = cleaned_data['end_date']
start_date = cleaned_data['start_date']
# do your cleaning here
return cleaned_data
否則,您必須確保在start_date
之前清除end_date
字段。
發生這種情況是因為在檢查end_date是否有效之前嘗試獲取end_date的clean_data。 如果在start_date之前聲明end_date,則在此情況下驗證end_date,之后調用clean_start_date。 在start_date之前聲明end_date,如下所示:
class CreateJobOpportunityForm(forms.Form):
subject = forms.CharField(max_length=30)
end_date = forms.DateField(widget=SelectDateWidget)
start_date = forms.DateField(widget=SelectDateWidget)
def clean_start_date(self):
start_date = self.cleaned_data['start_date']
end_date = self.cleaned_data['end_date']
if start_date > end_date :
raise forms.ValidationError("Start date should be before end date.")
return start_date
更換
end_date = self.cleaned_data['end_date']
同
end_date = self.data.get('end_date')
要么
在start_date
之前清理end_date
字段。
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