upload_csv.py

# This file must be saved in app/management/commands/upload_csv.py
# https://docs.djangoproject.com/en/3.2/howto/custom-management-commands/
from chinook.models import Playlist, PlaylistTrack, Track
from django.core.management import BaseCommand


def get_playlisttrack():
    data = []
    with open('PlaylistTrack.csv') as infile:
        next(infile)
        for line in infile:
            playlist_track = line.split('|')
            data.append(playlist_track)
    return data


class Command(BaseCommand):
    # Provide help at command prompt for user
    help = "Adds events"

    # A command must define handle()
    def handle(self, *args, **options):
        playlists_tracks = get_playlisttrack()
        for playlist_track in playlists_tracks:
            pl = Playlist.objects.get(pk=playlist_track[0])
            t = Track.objects.get(pk=playlist_track[1])
            plt = PlaylistTrack.objects.create(playlist=pl, track=t)
            plt.save()

        self.stdout.write("Task completed")