ValueError: Field 'id' expected a number but got 'Abidjan'

Question

Hello I'm new to django and I don't understand the following error: ValueError: Field 'id' expected a number but got 'Abidjan'. Here is the model code for more details:

class City(models.Model):
    city = models.CharField(max_length=25)
    date_create = models.DateTimeField(default=timezone.now())
    
    def __str__(self) -> str:
        return self.city
    
class District(models.Model):
    district = models.CharField(max_length=25)
    date_create = models.DateTimeField(default=timezone.now())

    def __str__(self) -> str:
        return self.district

class SliderSite(models.Model):
    title_image = models.CharField(max_length=25, blank=False)
    price = models.IntegerField(validators=[MinValueValidator(1), MaxValueValidator(1_000_000)])
    photo_profile = models.ImageField()

    city = models.ForeignKey(City, on_delete=models.CASCADE)
    district = models.ForeignKey(District, on_delete=models.CASCADE)
    
    data_create = models.DateTimeField(default=timezone.now)
    
    def __str__(self) -> str:
        return self.title_image