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Django之ModelForm:can't assign must be a instance

class DeployApplyForm(ModelForm):
	//project = forms.ChoiceField(choices=Project.objects.filter(prj_mgr='').value_list('id','name'))
	//使用上述程式碼會報can't assign must be a instance,所以要使用下行程式碼
    project = forms.ModelChoiceField(queryset=Project.objects.filter(prj_mgr=''))
    bgn_time = forms.DateTimeField(initial=datetime.datetime.now().strftime("%Y-%m-%dT%H:%M:%S"), label=u'開始',
                                   input_formats=['%Y-%m-%dT%H:%M:%S'], widget=forms.DateTimeInput(
            attrs={'type': 'datetime-local', 'emptyTips': u'請選擇時間', 'step': '1'}))
    end_time = forms.DateTimeField(initial=datetime.datetime.now().strftime("%Y-%m-%dT%H:%M:%S"), label=u'結束',
                                   input_formats=['%Y-%m-%dT%H:%M:%S'], widget=forms.DateTimeInput(
            attrs={'type': 'datetime-local', 'emptyTips': u'請選擇時間', 'step': '1'}))

    class Meta:
        model = DeployApply
        fields = '__all__'