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from django.db import models
from django.utils.encoding import python_2_unicode_compatible
class Event(models.Model):
# Oracle can have problems with a column named "date"
date = models.DateField(db_column="event_date")
class Parent(models.Model):
name = models.CharField(max_length=128)
class Child(models.Model):
parent = models.ForeignKey(Parent, editable=False, null=True)
name = models.CharField(max_length=30, blank=True)
age = models.IntegerField(null=True, blank=True)
class Genre(models.Model):
name = models.CharField(max_length=20)
class Band(models.Model):
name = models.CharField(max_length=20)
nr_of_members = models.PositiveIntegerField()
genres = models.ManyToManyField(Genre)
@python_2_unicode_compatible
class Musician(models.Model):
name = models.CharField(max_length=30)
def __str__(self):
return self.name
@python_2_unicode_compatible
class Group(models.Model):
name = models.CharField(max_length=30)
members = models.ManyToManyField(Musician, through='Membership')
def __str__(self):
return self.name
class Membership(models.Model):
music = models.ForeignKey(Musician)
group = models.ForeignKey(Group)
role = models.CharField(max_length=15)
class Quartet(Group):
pass
class ChordsMusician(Musician):
pass
class ChordsBand(models.Model):
name = models.CharField(max_length=30)
members = models.ManyToManyField(ChordsMusician, through='Invitation')
class Invitation(models.Model):
player = models.ForeignKey(ChordsMusician)
band = models.ForeignKey(ChordsBand)
instrument = models.CharField(max_length=15)
class Swallow(models.Model):
origin = models.CharField(max_length=255)
load = models.FloatField()
speed = models.FloatField()
class Meta:
ordering = ('speed', 'load')
class UnorderedObject(models.Model):
"""
Model without any defined `Meta.ordering`.
Refs #17198.
"""
bool = models.BooleanField(default=True)
class OrderedObjectManager(models.Manager):
def get_query_set(self):
return super(OrderedObjectManager, self).get_query_set().order_by('number')
class OrderedObject(models.Model):
"""
Model with Manager that defines a default order.
Refs #17198.
"""
name = models.CharField(max_length=255)
bool = models.BooleanField(default=True)
number = models.IntegerField(default=0, db_column='number_val')
objects = OrderedObjectManager()
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