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113 lines
3.0 KiB
Python
113 lines
3.0 KiB
Python
import datetime
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from django.db import models
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class Country(models.Model):
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# Table Column Fields
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name = models.CharField(max_length=50)
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def __str__(self):
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return self.name
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class Person(models.Model):
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# Table Column Fields
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name = models.CharField(max_length=128)
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person_country_id = models.IntegerField()
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# Relation Fields
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person_country = models.ForeignObject(
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Country,
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from_fields=["person_country_id"],
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to_fields=["id"],
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on_delete=models.CASCADE,
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)
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friends = models.ManyToManyField("self", through="Friendship", symmetrical=False)
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class Meta:
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ordering = ("name",)
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def __str__(self):
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return self.name
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class Group(models.Model):
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# Table Column Fields
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name = models.CharField(max_length=128)
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group_country = models.ForeignKey(Country, models.CASCADE)
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members = models.ManyToManyField(
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Person, related_name="groups", through="Membership"
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)
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class Meta:
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ordering = ("name",)
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def __str__(self):
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return self.name
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class Membership(models.Model):
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# Table Column Fields
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membership_country = models.ForeignKey(Country, models.CASCADE, null=True)
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date_joined = models.DateTimeField(default=datetime.datetime.now)
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invite_reason = models.CharField(max_length=64, null=True)
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person_id = models.IntegerField()
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group_id = models.IntegerField(blank=True, null=True)
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# Relation Fields
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person = models.ForeignObject(
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Person,
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from_fields=["person_id", "membership_country"],
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to_fields=["id", "person_country_id"],
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on_delete=models.CASCADE,
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)
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group = models.ForeignObject(
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Group,
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from_fields=["group_id", "membership_country"],
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to_fields=["id", "group_country"],
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on_delete=models.CASCADE,
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)
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class Meta:
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ordering = ("date_joined", "invite_reason")
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def __str__(self):
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group_name = self.group.name if self.group_id else "NULL"
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return "%s is a member of %s" % (self.person.name, group_name)
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class Friendship(models.Model):
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# Table Column Fields
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from_friend_country = models.ForeignKey(
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Country, models.CASCADE, related_name="from_friend_country"
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)
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from_friend_id = models.IntegerField()
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to_friend_country_id = models.IntegerField()
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to_friend_id = models.IntegerField()
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# Relation Fields
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from_friend = models.ForeignObject(
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Person,
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on_delete=models.CASCADE,
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from_fields=["from_friend_country", "from_friend_id"],
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to_fields=["person_country_id", "id"],
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related_name="from_friend",
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)
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to_friend_country = models.ForeignObject(
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Country,
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from_fields=["to_friend_country_id"],
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to_fields=["id"],
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related_name="to_friend_country",
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on_delete=models.CASCADE,
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)
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to_friend = models.ForeignObject(
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Person,
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from_fields=["to_friend_country_id", "to_friend_id"],
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to_fields=["person_country_id", "id"],
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related_name="to_friend",
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on_delete=models.CASCADE,
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)
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