old_contents: from django.db import models
  from cms.models.fields import PlaceholderField
  from managers import ChunkManager
  
  
  class Chunk(models.Model):
      tags = models.CharField(max_length=200)
      code = PlaceholderField('chunk_placeholder', related_name="chunks")
      priority = models.IntegerField()
  
      objects = ChunkManager()
  
      def has_tag(self, tag):
          tags = [string.strip() for string in str(self.tags).split(",")]
          return tag in tags
  
  # Create your models here.
  
new_contents: from django.db import models
  from cms.models.fields import PlaceholderField
  from managers import ChunkManager
  
  
  class Chunk(models.Model):
      tags = models.CharField(max_length=200)
      code = PlaceholderField('chunk_placeholder', related_name="chunks")
      priority = models.IntegerField()
  
      objects = ChunkManager()
  
      def __unicode__(self):
          return "Tags: %s. Priority: %s" % (self.tags, self.priority)
  
      def has_tag(self, tag):
          tags = [string.strip() for string in str(self.tags).split(",")]
          return tag in tags
  
  # Create your models here.
  
subject: Add useful method to know if a chunk has a tag