[drf]model设置

参考

//# 给model添加虚拟字段

class CeleryExampleResult(models.Model):
    task_id = models.BigIntegerField(default=0)
    task_instance_id = models.BigIntegerField()
    create_user = models.CharField(max_length=128, verbose_name="创建者", help_text="创建者")
    create_time = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
    update_time = models.DateTimeField(auto_now=True, verbose_name="更新时间")

    def _task_instance_url(self):
        return "http://192.168.2.101/?taskInstanceList&appId=%s#taskInstanceId=%s" % (self.task_id, self.task_instance_id)

    task_instance_url = property(_task_instance_url)

    class Meta:  # 注意，是模型的子类，要缩进！
        # db_table = 'celery_example_result'
        ordering = ["task_id"]
        verbose_name = "CeleryExampleResult执行结果表"
        verbose_name_plural = verbose_name

# 注: 这个字段在drf里是不会被序列化,不生效

参考

// get_FIELD_display
class Person(models.Model):
    SHIRT_SIZES = (
    ('S', 'Small'),
    ('M', 'Medium'),
    ('L', 'Large'),
    )
    name = models.CharField(max_length=60)
    shirt_size = models.CharField(max_length=1, choices=SHIRT_SIZES)


>>> p = Person(name="Fred Flintstone", shirt_size="L")
>>> p.save()
>>> p.shirt_size
'L'
>>> p.get_shirt_size_display()
'Large'

# 注: 这个字段在drf里是不会被序列化,不生效

//增加一个字段属性(上面例子的本质)

class CeleryExampleResult(models.Model):
    task_id = models.BigIntegerField(default=0)
    task_instance_id = models.BigIntegerField()
    create_user = models.CharField(max_length=128, verbose_name="创建者", help_text="创建者")
    create_time = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
    update_time = models.DateTimeField(auto_now=True, verbose_name="更新时间")


    @property
    def get_task_id_display(self):
        return "hello world, %s" % self.task_id

# 注: 这个字段在drf里是不会被序列化,不生效

//设计到数据是否存在, 数据逻辑处理, 可以将方法放到对应的models类中


class User(models.Model):
    email = models.EmailField(max_length=32, null=False, default="", unique=True)
    login_code = models.CharField(max_length=8, null=False, default="")
    login_code_created_time = models.DateTimeField(null=True)
    last_login_time = models.DateTimeField(null=True)

    @classmethod
    def create_login_code(cls, email):
        '''用户信息记录，验证码生成，发送邮件'''
        if email != "":
            user = None

            # 获取用户信息，若以前注册过则获取，否则创建用户信息
            try:
                user = User.objects.get(email=email)
            except ObjectDoesNotExist as e:
                user = User()
                user.email = email
                user.login_code = ""

            # 生成验证码并发送邮件
            if user.login_code == "" or user.login_code_created_time is None 
                or timezone.now() - user.login_code_created_time > timedelta(minutes=5):

                #生成验证码
                user.login_code = ''.join(random.sample(string.digits + string.ascii_letters, 6))
                user.login_code_created_time = timezone.now()

                try:
                    #发送验证码给用户
                    send_mail(
                        '[webchat]登陆验证码',
                        '请使用验证码 {0} 进行登陆，有效时间5分钟'.format(user.login_code),
                        settings.EMAIL_FROM,
                        [email],
                        fail_silently=False,
                    )
                except smtplib.SMTPException as e:
                    return False
                else:
                    # 记录验证码到数据库
                    user.save()
                    return True
            return True
        return False


    @classmethod
    def login(cls, email, login_code):
        '''登陆验证'''
        try:
            #获取用户
            user = User.objects.get(email=email)

            # 验证邮箱，验证码是否正确，同时验证验证码有效时间
            if email != "" and login_code != "" 
                and user.login_code_created_time 
                and login_code.lower() == user.login_code.lower() 
                and timezone.now() - user.login_code_created_time < timedelta(minutes=5):

                # 更新数据库记录
                user.login_code = ""
                user.last_login_time = timezone.now()
                user.save()
                return user
            return None
        except ObjectDoesNotExist as e:
            return None

    def __str__(self):
        return '{0}'.format(self.email)


//调用
code = 200 if User.create_login_code(email) else 400