optimize.py

class User(models.Model):
  ~~~~

class Post(models.Model):
  author = models.ForeignKey(User)
  column_a = modelsIntegerField(default=0)
  
  @property
  def comments(self):
    return self.comment_list.order_by('created_at')
      

class Comment(models.Model):
  author = models.ForeignKey(User)
  post = models.ForeignKey(Post, related_name='comment_list')


tmp = []
for j in tmp_list:
  tmp += Post.objects.filter(column_a=int(j)).select_related('author',
                                                             'comment_list', 
                                                             'comment_list__author')

# pass tmp to template,
# and Use tmp.comments