ernestophone.ens.fr/partitions/models.py

import os

from django.conf import settings
from django.db import models


class Category(models.Model):
    name = models.CharField(max_length=127)
    order = models.IntegerField(verbose_name="order")

    def __str__(self):
        return self.name

    class Meta:
        verbose_name = "catégorie"
        verbose_name_plural = "catégories"


class Partition(models.Model):
    nom = models.CharField(max_length=100)
    part = models.FileField(upload_to="partitions/")
    morceau = models.ForeignKey('PartitionSet', on_delete=models.CASCADE)

    def __str__(self):
        return self.nom

    def delete(self, *args, **kwargs):
        os.remove(os.path.join(settings.MEDIA_ROOT, self.part.name))
        super(Partition, self).delete(*args, **kwargs)


class PartitionSet(models.Model):
    nom = models.CharField(max_length=100)
    auteur = models.CharField(max_length=100)
    category = models.ForeignKey(
        Category,
        on_delete=models.PROTECT,
        verbose_name="Type de partition"
    )
    infos = models.TextField("Infos utiles", null=True, blank=True)

    def __str__(self):
        return("%s - %s [%s]" % (self.nom, self.auteur, self.category))