# -*- coding: utf-8 -*-

"""

42. Serialization

``django.core.serializers`` provides interfaces to converting Django

``QuerySet`` objects to and from "flat" data (i.e. strings).

"""

from decimal import Decimal

from django.db import models

class Category(models.Model):

    name = models.CharField(max_length=20)

    class Meta:

       ordering = ('name',)

    def __unicode__(self):

        return self.name

class Author(models.Model):

    name = models.CharField(max_length=20)

    class Meta:

        ordering = ('name',)

    def __unicode__(self):

        return self.name

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 __unicode__(self):

        return self.headline

class AuthorProfile(models.Model):

    author = models.OneToOneField(Author, primary_key=True)

    date_of_birth = models.DateField()

    def __unicode__(self):

        return u"Profile of %s" % self.author

class Actor(models.Model):

    name = models.CharField(max_length=20, primary_key=True)

    class Meta:

        ordering = ('name',)

    def __unicode__(self):

        return self.name

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 __unicode__(self):

        return self.title

class Score(models.Model):

    score = models.FloatField()

class Team(object):

    def __init__(self, title):

        self.title = title

    def __unicode__(self):

        raise NotImplementedError("Not so simple")

    def __str__(self):

        raise NotImplementedError("Not so simple")

    def to_string(self):

        return "%s" % self.title

class TeamField(models.CharField):

    __metaclass__ = models.SubfieldBase

    def __init__(self):

        super(TeamField, self).__init__(max_length=100)

    def get_db_prep_save(self, value):

        return unicode(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()

class Player(models.Model):

    name = models.CharField(max_length=50)

    rank = models.IntegerField()

    team = TeamField()

    def __unicode__(self):

        return u'%s (%d) playing for %s' % (self.name, self.rank, self.team.to_string())