old_contents: from __future__ import unicode_literals
  
  from django.db import models
  
  class Idea(models.Model):
      name = models.CharField(max_length=200)
      description = models.TextField()
      votes = models.IntegerField(default=0)
  
      def __unicode__(self):
          return self.name
new_contents: from __future__ import unicode_literals
  
  from django.db import models
  
  class Idea(models.Model):
      name = models.CharField(max_length=200, unique=True)
      description = models.TextField()
      votes = models.IntegerField(default=0)
  
      def __unicode__(self):
          return self.name
subject: Add unique parameter to idea name