from django.db import models

class Person(models.Model):

    first_name = models.CharField(max_length=100, unique=True)

    last_name = models.CharField(max_length=100)

    birthday = models.DateField()

    defaults = models.TextField()

class DefaultPerson(models.Model):

    first_name = models.CharField(max_length=100, default="Anonymous")

class ManualPrimaryKeyTest(models.Model):

    id = models.IntegerField(primary_key=True)

    data = models.CharField(max_length=100)

class Profile(models.Model):

    person = models.ForeignKey(Person, models.CASCADE, primary_key=True)

class Tag(models.Model):

    text = models.CharField(max_length=255, unique=True)

class Thing(models.Model):

    name = models.CharField(max_length=255)

    tags = models.ManyToManyField(Tag)

    @property

    def capitalized_name_property(self):

        return self.name

    @capitalized_name_property.setter

    def capitalized_name_property(self, val):

        self.name = val.capitalize()

    @property

    def name_in_all_caps(self):

        return self.name.upper()

class Publisher(models.Model):

    name = models.CharField(max_length=100)

class Author(models.Model):

    name = models.CharField(max_length=100)

class Book(models.Model):

    name = models.CharField(max_length=100)

    authors = models.ManyToManyField(Author, related_name="books")

    publisher = models.ForeignKey(

        Publisher,

        models.CASCADE,

        related_name="books",

        db_column="publisher_id_column",

    )