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from django.db import models
class Author(models.Model):
name = models.CharField(max_length=100)
age = models.IntegerField()
friends = models.ManyToManyField("self", blank=True)
rating = models.FloatField(null=True)
def __str__(self):
return self.name
class Publisher(models.Model):
name = models.CharField(max_length=255)
num_awards = models.IntegerField()
duration = models.DurationField(blank=True, null=True)
def __str__(self):
return self.name
class Book(models.Model):
isbn = models.CharField(max_length=9)
name = models.CharField(max_length=255)
pages = models.IntegerField()
rating = models.FloatField()
price = models.DecimalField(decimal_places=2, max_digits=6)
authors = models.ManyToManyField(Author)
contact = models.ForeignKey(Author, models.CASCADE, related_name="book_contact_set")
publisher = models.ForeignKey(Publisher, models.CASCADE)
pubdate = models.DateField()
def __str__(self):
return self.name
class Store(models.Model):
name = models.CharField(max_length=255)
books = models.ManyToManyField(Book)
original_opening = models.DateTimeField()
friday_night_closing = models.TimeField()
def __str__(self):
return self.name
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