from django.db import models
from django.contrib import admin

# Create your models here.
class AdminUser(models.Model):
    loginname = models.CharField(max_length=64, unique=True, db_index=True)
    fullname = models.CharField(max_length=64)
    email = models.EmailField(max_length=64)
    password = models.CharField(max_length=64)
    url_height = models.PositiveIntegerField(default=75)
    url_width = models.PositiveIntegerField(default=75)
    admin_icon = models.ImageField(upload_to="icons", height_field='url_height', width_field='url_width')

admin.site.register(AdminUser)

其中ImageFiled的两个参数height_field和width_field指定的是两个字段，它们的作用是自动填充字段

也就是说当上传图片后，它就会自动获取图片的高和宽，并存入url_height和url_width字段