old_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.db import models
  # from modeltrans.fields import TranslationField
  
  
  class Category(models.Model):
      name = models.CharField(max_length=255)
  
      # i18n = TranslationField(fields=('name', ))
  
      class Meta:
          verbose_name_plural = 'categories'
  
      def __str__(self):
          return self.name
  
  
  class Blog(models.Model):
      title = models.CharField(max_length=255)
      body = models.TextField(null=True, blank=True)
  
      category = models.ForeignKey(Category, null=True, blank=True)
  
      # i18n = TranslationField(fields=('title', 'body'))
  
      def __str__(self):
          return self.title
  
new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.db import models
  # from modeltrans.fields import TranslationField
  
  
  class Category(models.Model):
      name = models.CharField(max_length=255)
  
      # i18n = TranslationField(fields=('name', ), virtual_fields=False)
  
      class Meta:
          verbose_name_plural = 'categories'
  
      def __str__(self):
          return self.name
  
  
  class Blog(models.Model):
      title = models.CharField(max_length=255)
      body = models.TextField(null=True, blank=True)
  
      category = models.ForeignKey(Category, null=True, blank=True)
  
      # i18n = TranslationField(fields=('title', 'body'), virtual_fields=False)
  
      def __str__(self):
          return self.title
  
subject: Disable adding virtual fields during migration