1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
from django.db import models
class Tag(models.Model):
name = models.CharField(max_length=10)
parent = models.ForeignKey(
"self",
models.SET_NULL,
blank=True,
null=True,
related_name="children",
)
class Meta:
ordering = ["name"]
def __str__(self):
return self.name
class Celebrity(models.Model):
name = models.CharField("Name", max_length=20)
greatest_fan = models.ForeignKey(
"Fan",
models.SET_NULL,
null=True,
unique=True,
)
def __str__(self):
return self.name
class Fan(models.Model):
fan_of = models.ForeignKey(Celebrity, models.CASCADE)
class Staff(models.Model):
id = models.IntegerField(primary_key=True)
name = models.CharField(max_length=50)
organisation = models.CharField(max_length=100)
tags = models.ManyToManyField(Tag, through="StaffTag")
coworkers = models.ManyToManyField("self")
def __str__(self):
return self.name
class StaffTag(models.Model):
staff = models.ForeignKey(Staff, models.CASCADE)
tag = models.ForeignKey(Tag, models.CASCADE)
def __str__(self):
return "%s -> %s" % (self.tag, self.staff)
|
