old_contents: from django.db import models
  from django.urls import reverse
  import  django.contrib.postgres.fields as postgres
  from django.contrib.auth.models import User
  # Create your models here.
  class Entry(models.Model):
      title = models.CharField(max_length=200)
      content = models.TextField(max_length=1300)
      tags = postgres.ArrayField(models.CharField(max_length=12),size=5,null = False)
      created_at = models.DateTimeField(auto_now_add=True)
      edited_at = models.DateTimeField(auto_now=True)
      writer = models.ForeignKey(User,null=True,on_delete=models.CASCADE)
      def __str__(self):
          return self.title
      def get_absolute_url(self):
          return reverse('entry:detail',args=(self.pk,))
  
new_contents: from django.db import models
  from django.urls import reverse
  from taggit.managers import TaggableManager
  from django.contrib.auth.models import User
  # Create your models here.
  class Entry(models.Model):
      title = models.CharField(max_length=200)
      content = models.TextField(max_length=1300)
      tags = TaggableManager()
      created_at = models.DateTimeField(auto_now_add=True)
      edited_at = models.DateTimeField(auto_now=True)
      writer = models.ForeignKey(User,null=True,on_delete=models.CASCADE)
      def __str__(self):
          return self.title
      def get_absolute_url(self):
          return reverse('entry:detail',args=(self.pk,))
  
subject: Use taggit