old_contents: from django.db import models
  
  class Country(models.Model):
    # def __init__(self, name, iso_code):
    #   self.name = name
    #   self.iso_code = iso_code
    
    name = models.CharField(max_length = 200)
    iso_code = models.CharField(max_length=3)
  
  
  class Artist(models.Model):
    # def __init__(self, name, mbid, country_id):
    #   self.name = name
    #   self.mbid = mbid
    #   self.country_id = country_id
  
    name = models.CharField(max_length = 200)
    mbid = models.TextField()
    country_id = models.TextField()
  
new_contents: from django.db import models
  
  class Country(models.Model):
      name = models.TextField()
      iso_code = models.CharField(max_length=2)
  
  class Artist(models.Model):
      name = models.TextField()
      mbid = models.TextField()
      country = models.ForeignKey(Country)
  
subject: Fix country/artist models