Creating efficient database queries for hierarchical models (django)

Question

Consider this (django) model:

class Source(models.Model):
   # Some other fields
   type = models.ForeignKey(\'Type\')

class Type(models.Model):
    # Some othe         


        

Answer 1

Such a structure can easily be retrieved using a recursive common table expression.

An example is e.g. here: http://www.postgresql.org/docs/current/static/queries-with.html