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from django.contrib.auth.models import User
from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
from django.contrib.contenttypes.models import ContentType
from django.db import models
class Book(models.Model):
title = models.CharField(max_length=50)
year = models.PositiveIntegerField(null=True, blank=True)
author = models.ForeignKey(
User,
models.SET_NULL,
verbose_name="Verbose Author",
related_name="books_authored",
blank=True,
null=True,
)
contributors = models.ManyToManyField(
User,
verbose_name="Verbose Contributors",
related_name="books_contributed",
blank=True,
)
employee = models.ForeignKey(
"Employee",
models.SET_NULL,
verbose_name="Employee",
blank=True,
null=True,
)
is_best_seller = models.BooleanField(default=0, null=True)
date_registered = models.DateField(null=True)
availability = models.BooleanField(
choices=(
(False, "Paid"),
(True, "Free"),
(None, "Obscure"),
),
null=True,
)
# This field name is intentionally 2 characters long (#16080).
no = models.IntegerField(verbose_name="number", blank=True, null=True)
CHOICES = [
("non-fiction", "Non-Fictional"),
("fiction", "Fictional"),
(None, "Not categorized"),
("", "We don't know"),
]
category = models.CharField(max_length=20, choices=CHOICES, blank=True, null=True)
def __str__(self):
return self.title
class ImprovedBook(models.Model):
book = models.OneToOneField(Book, models.CASCADE)
class Department(models.Model):
code = models.CharField(max_length=4, unique=True)
description = models.CharField(max_length=50, blank=True, null=True)
def __str__(self):
return self.description
class Employee(models.Model):
department = models.ForeignKey(Department, models.CASCADE, to_field="code")
name = models.CharField(max_length=100)
def __str__(self):
return self.name
class TaggedItem(models.Model):
tag = models.SlugField()
content_type = models.ForeignKey(
ContentType, models.CASCADE, related_name="tagged_items"
)
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey("content_type", "object_id")
def __str__(self):
return self.tag
class Bookmark(models.Model):
url = models.URLField()
tags = GenericRelation(TaggedItem)
CHOICES = [
("a", "A"),
(None, "None"),
("", "-"),
]
none_or_null = models.CharField(
max_length=20, choices=CHOICES, blank=True, null=True
)
def __str__(self):
return self.url
|
