Django 表单没有获得清洁方法的价值

Question

我正在尝试从 Django 3.0 中的一个表单中编写一个干净的方法。在这里，当用户选择 production_process 时，干净的方法没有任何价值。并且在我的模板页面中出现错误，如

Production process: Select a valid choice. That choice is not one of the available choices.

这是我的表格.py

class ProductionCapacityForm(forms.ModelForm):
    date = forms.DateField(required=True, widget=forms.DateInput(attrs=
                                {
                                    'class':'datepicker'
                                }))
    
    def __init__(self, *args, **kwargs):
        self.client = kwargs.pop('client')
        self.request = kwargs.pop('request')
        try:
            self.work_time = kwargs.pop('work_time')
        except:
            pass
        super(ProductionCapacityForm, self).__init__(*args, **kwargs)
        self.fields['production_process'].queryset = ProductionProcess.objects.filter(is_deleted=False).values_list("name", flat=True).distinct()
        
        self.fields['date'].widget.attrs\
            .update({
                'placeholder': 'Select Date',
                'class': 'input-class_name'
            })
    def clean(self):
       production_process = self.cleaned_data.get('production_process')
       number_of_people = self.cleaned_data.get('number_of_people')
       datee = self.cleaned_data.get('date')
       pk = self.instance.pk
       if production_process:
         try:
           if production_process not in ProductionCapacity.objects.get(client=self.client, date=datee,production_process=production_process.id):
                self.cleaned_data['production_process'] = get_object_or_404(ProductionProcess,client=self.client,id=production_process.id)
        except:
            if ProductionCapacity.objects.filter(client=self.client, date=datee, production_process=production_process.id).exists():
                raise forms.ValidationError('Production Process is already exists')
        
        self.cleaned_data['number_of_people'] = number_of_people
        self.cleaned_data['date'] = datee
    return super(ProductionCapacityForm, self).clean()
class Meta:
    model = ProductionCapacity
    widgets = {
        "date": McamDateInput1,
    }
    fields = ['date', 'production_process', 'number_of_people']

这是我的模型.py

class ProductionCapacity(models.Model):
    client = models.ForeignKey(Client,on_delete=models.CASCADE)
    date = models.DateField(blank=True, null=True)
    production_process = models.ForeignKey(ProductionProcess,on_delete=models.CASCADE,blank=True,null=True)
    number_of_people = models.IntegerField(blank=True, null=True)

这里

Answer 1

我怀疑是因为这条线：

self.cleaned_data['production_process'] = get_object_or_404(ProductionProcess,client=self.client,id=production_process.id)

get_object_or_404

用于检索要显示的对象。在这种情况下，您仅在代码中检索它。您不想要 404 http 响应，这几乎肯定不是有效的生产过程。

只要得到对象，如果它不存在，你就会得到

None

Answer 2

我对

clean()

方法做了一个小修改，以解决您遇到的

production_proces

字段未包含在表单的

cleaned_data

字典中的问题。

试试这个：

def clean(self):
    cleaned_data = super().clean()
    production_process = cleaned_data.get('production_process')
    number_of_people = cleaned_data.get('number_of_people')
    datee = cleaned_data.get('date')
    pk = self.instance.pk
    if production_process:
        try:
            if production_process.id not in ProductionCapacity.objects.filter(client=self.client, date=datee, production_process=production_process).values_list('production_process__id', flat=True):
                cleaned_data['production_process'] = get_object_or_404(ProductionProcess, client=self.client, id=production_process.id)
        except:
            if ProductionCapacity.objects.filter(client=self.client, date=datee, production_process=production_process).exists():
                raise forms.ValidationError('Production Process is already exists')

    cleaned_data['number_of_people'] = number_of_people
    cleaned_data['date'] = datee

    return cleaned_data

这里的主要变化是我现在调用

super().clean()

来获取表单的

cleaned_data

字典，而不是直接返回它。然后我用

number_of_people

和

datee

的清理值更新这本字典。最后，我要返回更新后的

cleaned_data

字典。这样可以确保所有清理过的字段都包含在

cleaned_data

字典中，包括

production_process

.