from django.db import models


class Continent(models.Model):
    name = models.CharField(max_length=30, unique=True)
    code = models.CharField(max_length=2, unique=True)

    class Meta:
        ordering = ["name"]

    def __str__(self):
        return "%s -- %s" % (self.name, self.code)


class Country(models.Model):
    name = models.CharField(max_length=30, unique=True)
    code = models.CharField(max_length=2, unique=True)
    capital = models.CharField(max_length=30)

    population = models.PositiveIntegerField()
    area = models.PositiveIntegerField()

    continent = models.ForeignKey("Continent", related_name="countries")

    class Meta:
        ordering = ["name"]

    def __str__(self):
        return "%s -- %s -- %s -- %s -- %s -- %s" % (
            self.name, self.code, self.capital, self.population, self.area, self.continent)