old_contents: #-*- coding: utf-8 -*-
  from django.db import models
  from django.core import validators
  from .fields.models.caseinsensitivecharfield import CaseInsensitiveCharField
  
  class Country(models.Model):
      class Meta:
          verbose_name_plural = "Countries"
      
      id = CaseInsensitiveCharField(primary_key=True, max_length=2)
      name = models.CharField(max_length=50)
      active = models.BooleanField(default=False)
      
      def __unicode__(self):
          return unicode("({0}) {1}").format(self.id, self.name)
  
  class Code(models.Model):
      class Meta:
          ordering = ("id",)
      
      id = models.PositiveSmallIntegerField(primary_key=True, validators=[validators.MinValueValidator(1)])
      active = models.BooleanField(default=False)
      
      def __unicode__(self):
          return unicode(self.id)
  
  class CountryCodeManager(models.Manager):
      def get_by_natural_key(self, country, code):
          return self.get(country=country, code=code)
  
  class CountryCode(models.Model):
      class Meta:
          unique_together = ("country", "code")
          ordering = unique_together
      
      objects = CountryCodeManager()
      
      country = models.ForeignKey(Country, related_name="country_codes")
      code = models.ForeignKey(Code, related_name="country_codes")
      active = models.BooleanField(default=False)
      
      def __unicode__(self):
          return unicode("{} {}").format(self.code, self.country)
new_contents: #-*- coding: utf-8 -*-
  from django.db import models
  from django.core import validators
  from .fields.models.caseinsensitivecharfield import CaseInsensitiveCharField
  
  class Country(models.Model):
      class Meta:
          verbose_name_plural = "Countries"
      
      id = CaseInsensitiveCharField(primary_key=True, max_length=2)
      name = models.CharField(max_length=50)
      active = models.BooleanField(default=False)
      
      def __unicode__(self):
          return unicode("{} ({})").format(self.name, self.id)
  
  class Code(models.Model):
      class Meta:
          ordering = ("id",)
      
      id = models.PositiveSmallIntegerField(primary_key=True, validators=[validators.MinValueValidator(1)])
      active = models.BooleanField(default=False)
      
      def __unicode__(self):
          return unicode(self.id)
  
  class CountryCodeManager(models.Manager):
      def get_by_natural_key(self, country, code):
          return self.get(country=country, code=code)
  
  class CountryCode(models.Model):
      class Meta:
          unique_together = ("country", "code")
          ordering = unique_together
      
      objects = CountryCodeManager()
      
      country = models.ForeignKey(Country, related_name="country_codes")
      code = models.ForeignKey(Code, related_name="country_codes")
      active = models.BooleanField(default=False)
      
      def __unicode__(self):
          return unicode("{}, +{}").format(self.country, self.code)
subject: adjust __unicode__ method format strings