[PYTHON] Sort django models by specific criteria

I want to sort django models by specific criteria

models.py

class Tag(models.Model):
    #ID given to the tag
    tag_id = models.AutoField(primary_key=True, verbose_name='Tag ID')
    #Tag name
    tag_name = models.CharField(max_length=20, verbose_name='Tag name')

    def __str__(self):
        return str(self.tag_name)

class IdeaTagMap(models.Model):
    ideatag_id = models.AutoField(primary_key=True, verbose_name='Idea tag ID')
    #Posted to be linked
    idea = models.ForeignKey(PostIdea, on_delete=models.CASCADE)
    #Tags to be tied
    tag = models.ForeignKey(Tag, on_delete=models.CASCADE)

    def __str__(self):
        return str(self.idea) + '_' + str(self.tag)

When there is such a model, the Tag model is basically displayed in the order of addition, but I want to be able to display the display order in the order of the number of times referenced in IdeaTagMap.

The fastest way is to use models.Manager.

models.py

#Added as Tag Manager
class TagManager(models.Manager):
    #Show how many times each tag is used in IdeaTagMap and sort in descending order.
    def get_queryset(self):
        return super().get_queryset().annotate(
            ideatagmap_count= models.Count('ideatagmap')
        ).order_by('-ideatagmap_count')

class Tag(models.Model):
    tag_id = models.AutoField(primary_key=True, verbose_name='Tag ID')
    tag_name = models.CharField(max_length=20, verbose_name='Tag name')
    #add to
    objects = TagManager()

    def __str__(self):
        return str(self.tag_name) + '(' + str(self.ideatagmap_count) + ')'

class IdeaTagMap(models.Model):
    ideatag_id = models.AutoField(primary_key=True, verbose_name='Idea tag ID')
    #Posted to be linked
    idea = models.ForeignKey(PostIdea, on_delete=models.CASCADE)
    #Tags to be tied
    tag = models.ForeignKey(Tag, on_delete=models.CASCADE)

    def __str__(self):
        return str(self.idea) + '_' + str(self.tag)

You can sort the order by creating this TagManager.

reference image

Consideration, impression

It is thought that the trend function etc. also sets the time axis to these, so I would like to study more and implement it.