Django-Modelform中设置新增字段() class Meta

from django import forms
from app01.models import UserInfo
from django.forms import fields as Ffields
from django.forms import widgets as Fwidgets
import time, datetime


class UserInfoModelForm(forms.ModelForm):
    age = Ffields.IntegerField(
        label='年龄',
        widget=Fwidgets.TextInput(attrs={'class': 'form-control'}),
        initial=22
    )
    gender = Ffields.CharField(
        label='性别',
        widget=Fwidgets.TextInput(attrs={'class': 'form-control'}),
        initial='男'
    )
    birth = Ffields.DateField(
        label='生日',
        widget=Fwidgets.DateTimeInput()
    )

    class Meta:
        # 与models建立了依赖关系.........................................
        model = UserInfo

        # 字段.........................................................
        fields = ['username', 'email', 'user_type', 'age']

        # 排除字段......................................................
        exclude = None,

        # 帮助提示信息...................................................
        help_texts = {
                         'username': '请输入账号',
                         'email': '请输入邮箱地址',
                         'user_type': '请选择客户类型'
                     },

        # 自定义插件.....................................................
        widgets = {
                      'username': Fwidgets.TextInput(attrs={'class': 'form-control'})
                  },

        # 自定义字段类（也可以自定义字段）...................................
        field_classes = {
            # 设置此处,前端输入时,就必须是url,否则提示错误
            # 'email': Ffields.URLField,
        }

        # 本地化，如：根据不同时区显示数据...................................
        localized_fields = ('ctime',)

        # 如果此处不写,会显示数据库模型设置的verbose_name....................
        labels = {
            'username': '账号',
            'email': '邮箱',
            'user_type': '类型'
        }

        # 自定义错误信息..................................................
        # 整体错误信息from django.core.exceptions import NON_FIELD_ERRORS
        error_messages = {
            '__all__': {
                'required': '此处不能为空'
            },
            'age': {
                'invalid': '请输入一个有效的年龄'
            }
        }