django - 如何通过一些计算从不同的 ModelForm 字段中填充模型字段值？

Question

我想age在我的字段中ModelForm使用它来填充birth_year模型。
这样做的惯用方法是什么？我应该在我的表单或模型或元类中提供什么方法​​？

Answer 1

from datetime import datetime
import forms
from myapp.models import MyModel


class MyAgeForm(forms.ModelForm):
    age = forms.IntegerField()
    # define other custom fields here

    class Meta:
       model = MyModel
       # probably define what fields from the model to include/exclude here


    def save(self, *args, **kwargs):
        self.instance.birth_year = datetime.now().year - self.cleaned_data['age']
        return super(MyAgeForm, self).save(*args, **kwargs)