How to interact between Models inside model.py?

Question

There is something I want to do but I don't know how to do it. in this case I have 2 Models in project named 1.Music 2.Artist

1. Music Model is saving music details such as musicName,artistName,genre,etc...
2. Artist Model has only one job and that is saving Artist names.

I want to write a code for my models to when I'm adding a new music in admin panel, Music Model checks the Artist Model for existence artist names and if artist name existed => just add music details and if artist name not existed Then add a new artist in Artist Model.

This is my sample model.py code:

class Artist(models.Model):
    name = models.CharField(max_length=100)


class Music(models.Model):
    name = models.CharField(max_length=100)
    artist = models.CharField(max_length=100)
    genre = models.CharField(max_length=100)

Answer 1

You can use ForeignKey in artist field instead of CharField. So, your Music model will look like this:

class Music(models.Model):
    name = models.CharField(max_length=100)
    artist = models.ForeignKey(Artist, null=True, on_delete=models.SET_NULL)
    genre = models.CharField(max_length=100)

When you want to get musics by spesific artist in views.py, use filter():

musics = Music.objects.filter(artist=1)