django-signal实例到电子邮件发送属性编码

美好的一天 . 带信号的模型必须发送到电子邮件实例，但我已经在codeblock之后放置了追溯

class ParticipantModel(models.Model):

TYPE_USER = (
    ('O', 'Онлайн трансляция'),
    ('P', 'Персональное присутствие'),
)
name = models.CharField( max_length=256, verbose_name='Имя')
surname = models.CharField(max_length=50, verbose_name='Фамилия')
position = models.CharField(max_length=50, verbose_name='Должность')
company = models.CharField(max_length=50, verbose_name='Название компании')
city = models.CharField(max_length=50, verbose_name='Город')
email = models.EmailField(verbose_name='Электро почта')
phone = models.CharField(max_length="50", verbose_name="Телефон")
phonem = models.CharField(max_length="50", verbose_name="Мобильный телефон")
www = models.URLField(verbose_name="Сайт")
tuser = models.CharField(max_length='250', choices=TYPE_USER, verbose_name="Форма вашего участия")
class Meta:
    verbose_name = ('Участник')
    verbose_name_plural = ('Участники')

def send_marketing(self, sender, instance, created, **kwargs):
if created:
    message = instance
    subject = "McAfee day"
    from_email = 'bakotech.events@gmail.com'
    recipient_list = ('sergey@avetisyan.com.ua', 'marketing@bakotech.com')
    send_mail(subject, message, from_email, recipient_list)
post_save.connect(send_marketing, sender=ParticipantModel)

追溯：

/ reg 'ParticipantModel'对象的AttributeError没有属性'encode'请求方法：POST请求URL：
Django版本：1.5.2异常类型：AttributeError异常值：
'ParticipantModel'对象没有属性'encode'异常位置：/usr/lib/python2.7/email/encoders.py in encode_7or8bit，第73行Python可执行文件：/ usr / bin / uwsgi-core Python版本：2.7.3 Python路径：
['.'，'', ' /home/sergey/djprojects/venvs/bakoevents/local/lib/python2.7/site-packages/pip-1.1-py2.7.egg ', ' / home / sergey / djprojects / venvs / bakoevents / local /lib/python2.7/site-packages/distribute-0.7.3-py2.7.egg ', ' /home/sergey/djprojects/venvs/bakoevents/local/lib/python2.7/site-packages/setuptools-1.1- py2.7.egg ', ' /home/sergey/djprojects/venvs/bakoevents/lib/python2.7/site-packages/pip-1.1-py2.7.egg ', ' / home / sergey / djprojects / venvs / bakoevents / lib / python2.7 / site-packages / distribute-0.7.3-py2.7.egg ', ' /home/sergey/djprojects/venvs/bakoevents/lib/python2.7/site-packages/setuptools-1.1-py2.7.egg ', ' /home/sergey/djprojects/venvs/bakoevents/lib/python2.7 ', ' /home/sergey/djprojects/venvs/bakoevents/lib/python2.7/plat-linux2 ', ' / home / sergey / djprojects / venvs / bakoevents / lib / python2.7 / lib-tk ', ' /home/sergey/djprojects/venvs/bakoevents/lib/python2.7/lib-old ', ' /home/sergey/djprojects/venvs/bakoevents/lib/python2.7/ lib-dynload ', ' /usr/lib/python2.7 ', ' /usr/lib/python2.7/plat-linux2 ', ' /usr/lib/python2.7/lib-tk ', '/ home / sergey / djprojects / venvs / bakoevents / local / lib / python2.7 / site-packages ', ' /home/sergey/djprojects/venvs/bakoevents/local/lib/python2.7/site-packages/PIL ', ' / home / sergey / djprojects / venvs / bakoevents / lib / python2.7 / site-packages ', ' /home/sergey/djprojects/venvs/bakoevents/lib/python2.7/site-packages/PIL']服务器时间：Срд，11Сен201319:49:00 0300