Django currently does not support the "Point" datatype in MySQL. That's why I created my own.

class PointField(models.Field):
    def db_type(self):
        return 'Point'

class Tag(models.Model):
    user = models.ForeignKey(User)
    utm = PointField()

As you can see, this works, and syncdb creates the model fine.

However, my current code calculates a length between two Points using raw SQL.

cursor.execute("SELECT user_id FROM life_tag WHERE\
              (GLength(LineStringFromWKB(LineString(asbinary(utm), asbinary(PointFromWKB(point(%s, %s)))))) < 55)...

This says: Select where the length between the given point and the table point is less than 55.

How can I do this with Django instead of RAW SQL? I don't want to do cursors and SELECT statements anymore. How can I modify the models.py in order to do this?