old_contents: from django.db import models
  
  
  class Category(models.Model):
      application = models.ForeignKey(
          'Application',
          on_delete=models.CASCADE,
          verbose_name="어플리케이션",
      )
      title = models.CharField(
          max_length=20,
          verbose_name="제목",
      )
  
      def __str__(self):
          return self.title
  
      class Meta:
          verbose_name = "Category"
          verbose_name_plural = "Category"
  
new_contents: from django.db import models
  
  
  class Category(models.Model):
      application = models.ForeignKey(
          'Application',
          on_delete=models.CASCADE,
          verbose_name="어플리케이션",
      )
      title = models.CharField(
          max_length=20,
          verbose_name="카테고리 제목",
      )
  
      def __str__(self):
          return self.title
  
      class Meta:
          verbose_name = "Category"
          verbose_name_plural = "Category"
  
subject: update Category model