多级继承中的Django模型问题。

Question

类注册（models.Model）：     user = models.OneToOneField（User，related_name =＆＃39; customer＆＃39;，on_delete = models.CASCADE）     DOB = models.DateField（null = True，blank = True，默认=＆＃39;＆＃39;）     post_code = models.CharField（max_length = 10）     area = models.TextField（）

# account type choices

OWNER = 'OW'
WRITER = 'WR'
ANALYST = 'AN'
REFEREE = 'RE'

ACCOUNT_TYPE_CHOICES = (
    (OWNER, 'League wner'),
    (WRITER, 'Sports Writer'),
    (REFEREE, 'Referee'),
    (ANALYST, 'Analyst'),
)
account_type = models.CharField(
    max_length=2,
    choices=ACCOUNT_TYPE_CHOICES,
    default=REFEREE,
)
activation_key = models.CharField(max_length=255, null=True, blank=True)
activation_time = models.DateTimeField(auto_now_add=True, null=True, blank=True)
is_activate = models.BooleanField(default=False, blank=True)
is_admin_accepted = models.BooleanField(default=False, blank=True)
# this is included to keep record . Eiher this user has already been rejected by Admin
is_admin_rejected = models.BooleanField(default=False, blank=True)

def __str__(self):
    return (self.user.username)

class Match（models.Model）：     GAME_HOUR =（         （9，＆＃39; 9＆＃39;），         （10，＆＃39; 10＆＃39;），         （11，＆＃39; 11＆＃39;），         （12，＆＃39; 12＆＃39;），         （13，＆＃39; 13＆＃39;），         （14，＆＃39; 14＆＃39;），         （15，＆＃39; 15＆＃39;），         （16，＆＃39; 16＆＃39;），         （17，＆＃39; 17＆＃39;），         （18，＆＃39; 18＆＃39;），         （19，＆＃39; 19＆＃39;），         （20，＆＃39; 20＆＃39;），         （21，＆＃39; 21＆＃39;）     ）

GAME_TIME = (
    (00, '00'),
    (10, '10'),
    (15, '15'),
    (20, '20'),
    (30, '30'),
    (45, '45')
)

MATCH_FORMAT = (
    ('11v11', '11v11'),
    ('9v9', '9v9'),
    ('8v8', '8v8'),
    ('7v7', '7v7'),
    ('6v6', '6v6'),
    ('5v5', '5v5'),
    ('3v3', '3v3')
)

MATCH_TYPE = (
    ('League', 'League'),
    ('Friendly', 'Friendly'),
    ('KickAbout', 'Kick-About')
)
team1 = models.ForeignKey(Team, on_delete=models.CASCADE, related_name='team1', null=False)
team2 = models.ForeignKey(Team, on_delete=models.CASCADE, related_name='team2', null=False)

由于导致错误的注册导致用户匹配查询

不存在。

referee = models.ForeignKey(Registration, on_delete=models.CASCADE, null=False, default='0')
match_format = models.CharField(choices=MATCH_FORMAT, null=False, max_length=20,default='5v5')
match_type = models.CharField(choices=MATCH_TYPE, null=False, max_length=20 ,default='Friendly')
accepted = models.BooleanField(null=False, default=False)
game_time = models.IntegerField(choices=GAME_TIME, null=False ,default='30')
game_hour = models.IntegerField(choices=GAME_HOUR, null=False,default='10')
date = models.DateField(null=False,default='2018-04-28')
creation_date = models.DateField(null=False,default='2018-04-28')
last_update_date = models.DateField(null=False,default='2018-04-28')
last_update_time = models.TimeField(null=True)
season_id = models.ForeignKey(Season, on_delete=models.CASCADE, related_name='Session_Id', null=False, default=2)
live = models.BooleanField(null=False, default=False)
registration = models.ForeignKey(Registration, on_delete=models.CASCADE, null=True,default=0)
match_code = models.CharField(max_length=10, default='ABC',blank=False)
match_end = models.TimeField(null=True)
played = models.BooleanField(default=False)

def str （自我）：         返回＆＃34; ％d＆＃34; ％self.id

我制作了2个模型（1个注册继承了用户模型.2。匹配继承注册的模型）但是当我创建Match然后我得到错误＆＃34;用户匹配查询不存在。＆＃ 34;