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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
from datetime import datetime
from django.db import models
# M2M described on one of the models
class Person(models.Model):
name = models.CharField(max_length=128)
class Meta:
ordering = ('name',)
class PersonChild(Person):
pass
class Group(models.Model):
name = models.CharField(max_length=128)
members = models.ManyToManyField(Person, through='Membership')
custom_members = models.ManyToManyField(Person, through='CustomMembership', related_name="custom")
nodefaultsnonulls = models.ManyToManyField(
Person,
through='TestNoDefaultsOrNulls',
related_name="testnodefaultsnonulls",
)
class Meta:
ordering = ('name',)
class Membership(models.Model):
person = models.ForeignKey(Person, models.CASCADE)
group = models.ForeignKey(Group, models.CASCADE)
date_joined = models.DateTimeField(default=datetime.now)
invite_reason = models.CharField(max_length=64, null=True)
class Meta:
ordering = ('date_joined', 'invite_reason', 'group')
def __str__(self):
return "%s is a member of %s" % (self.person.name, self.group.name)
class CustomMembership(models.Model):
person = models.ForeignKey(
Person,
models.CASCADE,
db_column="custom_person_column",
related_name="custom_person_related_name",
)
group = models.ForeignKey(Group, models.CASCADE)
weird_fk = models.ForeignKey(Membership, models.SET_NULL, null=True)
date_joined = models.DateTimeField(default=datetime.now)
class Meta:
db_table = "test_table"
ordering = ["date_joined"]
def __str__(self):
return "%s is a member of %s" % (self.person.name, self.group.name)
class TestNoDefaultsOrNulls(models.Model):
person = models.ForeignKey(Person, models.CASCADE)
group = models.ForeignKey(Group, models.CASCADE)
nodefaultnonull = models.IntegerField()
class PersonSelfRefM2M(models.Model):
name = models.CharField(max_length=5)
friends = models.ManyToManyField('self', through="Friendship", symmetrical=False)
sym_friends = models.ManyToManyField('self', through='SymmetricalFriendship', symmetrical=True)
class Friendship(models.Model):
first = models.ForeignKey(PersonSelfRefM2M, models.CASCADE, related_name="rel_from_set")
second = models.ForeignKey(PersonSelfRefM2M, models.CASCADE, related_name="rel_to_set")
date_friended = models.DateTimeField()
class SymmetricalFriendship(models.Model):
first = models.ForeignKey(PersonSelfRefM2M, models.CASCADE)
second = models.ForeignKey(PersonSelfRefM2M, models.CASCADE, related_name='+')
date_friended = models.DateField()
# Custom through link fields
class Event(models.Model):
title = models.CharField(max_length=50)
invitees = models.ManyToManyField(
to=Person,
through='Invitation',
through_fields=['event', 'invitee'],
related_name='events_invited',
)
class Invitation(models.Model):
event = models.ForeignKey(Event, models.CASCADE, related_name='invitations')
# field order is deliberately inverted. the target field is "invitee".
inviter = models.ForeignKey(Person, models.CASCADE, related_name='invitations_sent')
invitee = models.ForeignKey(Person, models.CASCADE, related_name='invitations')
class Employee(models.Model):
name = models.CharField(max_length=5)
subordinates = models.ManyToManyField(
'self',
through="Relationship",
through_fields=('source', 'target'),
symmetrical=False,
)
class Meta:
ordering = ('pk',)
class Relationship(models.Model):
# field order is deliberately inverted.
another = models.ForeignKey(Employee, models.SET_NULL, related_name="rel_another_set", null=True)
target = models.ForeignKey(Employee, models.CASCADE, related_name="rel_target_set")
source = models.ForeignKey(Employee, models.CASCADE, related_name="rel_source_set")
class Ingredient(models.Model):
iname = models.CharField(max_length=20, unique=True)
class Meta:
ordering = ('iname',)
class Recipe(models.Model):
rname = models.CharField(max_length=20, unique=True)
ingredients = models.ManyToManyField(
Ingredient, through='RecipeIngredient', related_name='recipes',
)
class Meta:
ordering = ('rname',)
class RecipeIngredient(models.Model):
ingredient = models.ForeignKey(Ingredient, models.CASCADE, to_field='iname')
recipe = models.ForeignKey(Recipe, models.CASCADE, to_field='rname')
|
