MarietjeDjango/marietje/songs/models.py

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


class Song(models.Model):
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.SET_NULL,
        blank=True,
        null=True,
        db_index=True)
    artist = models.CharField(
        max_length=200, db_index=True, help_text='track artist')
    title = models.CharField(
        max_length=200, db_index=True, help_text='track title')
    hash = models.CharField(
        max_length=64, help_text="track file's SHA256 hash")
    duration = models.IntegerField(help_text='track duration in seconds')
    rg_gain = models.DecimalField(
        max_digits=9,
        decimal_places=6,
        blank=True,
        null=True,
        help_text='replaygain gain level')
    rg_peak = models.DecimalField(
        max_digits=9,
        decimal_places=6,
        blank=True,
        null=True,
        help_text='replaygain peak level')
    old_id = models.TextField(blank=True, null=True, default=None)
    deleted = models.BooleanField(
        verbose_name='unlisted',
        default=False,
        db_index=True,
        help_text='hide this song from the search listings')

    def report(self, user, note):
        report_note = ReportNote(song=self, user=user, note=note)
        report_note.save()

    def __str__(self):
        return self.artist + ' - ' + self.title

class ReportNote(models.Model):
    song = models.ForeignKey(
        Song,
        on_delete=models.CASCADE,
        blank=False,
        null=False,
        db_index=True)
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        blank=True,
        null=True,
        db_index=True)
    note = models.TextField(
        verbose_name='reason',
        blank=True,
        help_text='reason for edit request')

    def __str__(self):
        return "{song.artist} - {song.title}: '{note}'".format(song=self.song, note=self.note)