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109 lines
3.0 KiB
Python
109 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(Person, related_name='groups', through='Membership')
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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)
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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(Country, models.CASCADE, related_name="from_friend_country")
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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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