from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation

from django.contrib.contenttypes.models import ContentType

from django.db import models

class Episode(models.Model):

    name = models.CharField(max_length=100)

    length = models.CharField(max_length=100, blank=True)

    author = models.CharField(max_length=100, blank=True)

class Media(models.Model):

    """

    Media that can associated to any object.

    """

    content_type = models.ForeignKey(ContentType, models.CASCADE)

    object_id = models.PositiveIntegerField()

    content_object = GenericForeignKey()

    url = models.URLField()

    description = models.CharField(max_length=100, blank=True)

    keywords = models.CharField(max_length=100, blank=True)

    def __str__(self):

        return self.url

#

# Generic inline with unique_together

#

class Category(models.Model):

    name = models.CharField(max_length=50)

class PhoneNumber(models.Model):

    content_type = models.ForeignKey(ContentType, models.CASCADE)

    object_id = models.PositiveIntegerField()

    content_object = GenericForeignKey("content_type", "object_id")

    phone_number = models.CharField(max_length=30)

    category = models.ForeignKey(Category, models.SET_NULL, null=True, blank=True)

    class Meta:

        unique_together = (

            (

                "content_type",

                "object_id",

                "phone_number",

            ),

        )

class Contact(models.Model):

    name = models.CharField(max_length=50)

    phone_numbers = GenericRelation(PhoneNumber, related_query_name="phone_numbers")

#

# Generic inline with can_delete=False

#

class EpisodePermanent(Episode):

    pass