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from django.db import models
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)
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)
class Musician(models.Model):
name = models.CharField(max_length=30)
def __unicode__(self):
return self.name
class Group(models.Model):
name = models.CharField(max_length=30)
members = models.ManyToManyField(Musician, through='Membership')
def __unicode__(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)
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