利用form表单保持select数据实时更新

    from django import forms
    from wang import models
    class ClothesForm(forms.Form):
        color = forms.IntegerField(required=True, widget=forms.Select(), )
        def __init__(self, *args, **kwargs):
            # 定义这个关键字段，当使用form时，colors表新增了颜色，前端ClothesForm的color字段的选项会自动更新
            super(ClothesForm, self).__init__(*args, **kwargs)
            self.fields['color'].widget.choices = Colors.objects.all().order_by('id').values_list('id', 'colors')