mirror of
https://github.com/django/django.git
synced 2025-10-29 08:36:09 +00:00
127 lines
2.8 KiB
Python
127 lines
2.8 KiB
Python
# -*- coding: utf-8 -*-
|
|
"""
|
|
42. Serialization
|
|
|
|
``django.core.serializers`` provides interfaces to converting Django
|
|
``QuerySet`` objects to and from "flat" data (i.e. strings).
|
|
"""
|
|
from __future__ import unicode_literals
|
|
|
|
from decimal import Decimal
|
|
|
|
from django.db import models
|
|
from django.utils import six
|
|
from django.utils.encoding import python_2_unicode_compatible
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class Category(models.Model):
|
|
name = models.CharField(max_length=20)
|
|
|
|
class Meta:
|
|
ordering = ('name',)
|
|
|
|
def __str__(self):
|
|
return self.name
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class Author(models.Model):
|
|
name = models.CharField(max_length=20)
|
|
|
|
class Meta:
|
|
ordering = ('name',)
|
|
|
|
def __str__(self):
|
|
return self.name
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class Article(models.Model):
|
|
author = models.ForeignKey(Author)
|
|
headline = models.CharField(max_length=50)
|
|
pub_date = models.DateTimeField()
|
|
categories = models.ManyToManyField(Category)
|
|
|
|
class Meta:
|
|
ordering = ('pub_date',)
|
|
|
|
def __str__(self):
|
|
return self.headline
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class AuthorProfile(models.Model):
|
|
author = models.OneToOneField(Author, primary_key=True)
|
|
date_of_birth = models.DateField()
|
|
|
|
def __str__(self):
|
|
return "Profile of %s" % self.author
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class Actor(models.Model):
|
|
name = models.CharField(max_length=20, primary_key=True)
|
|
|
|
class Meta:
|
|
ordering = ('name',)
|
|
|
|
def __str__(self):
|
|
return self.name
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class Movie(models.Model):
|
|
actor = models.ForeignKey(Actor)
|
|
title = models.CharField(max_length=50)
|
|
price = models.DecimalField(max_digits=6, decimal_places=2, default=Decimal('0.00'))
|
|
|
|
class Meta:
|
|
ordering = ('title',)
|
|
|
|
def __str__(self):
|
|
return self.title
|
|
|
|
|
|
class Score(models.Model):
|
|
score = models.FloatField()
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class Team(object):
|
|
def __init__(self, title):
|
|
self.title = title
|
|
|
|
def __str__(self):
|
|
raise NotImplementedError("Not so simple")
|
|
|
|
def to_string(self):
|
|
return "%s" % self.title
|
|
|
|
|
|
class TeamField(six.with_metaclass(models.SubfieldBase, models.CharField)):
|
|
|
|
def __init__(self):
|
|
super(TeamField, self).__init__(max_length=100)
|
|
|
|
def get_db_prep_save(self, value, connection):
|
|
return six.text_type(value.title)
|
|
|
|
def to_python(self, value):
|
|
if isinstance(value, Team):
|
|
return value
|
|
return Team(value)
|
|
|
|
def value_to_string(self, obj):
|
|
return self._get_val_from_obj(obj).to_string()
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class Player(models.Model):
|
|
name = models.CharField(max_length=50)
|
|
rank = models.IntegerField()
|
|
team = TeamField()
|
|
|
|
def __str__(self):
|
|
return '%s (%d) playing for %s' % (self.name, self.rank, self.team.to_string())
|