[Fixed]-Django not updating object in classmethod. Very strange

When you save the address in the class method, it updates the object in the database, but not in the view.

You can call the refresh_from_db method to reload the values from the database.

if default.lower() == "true":        
    print "default is true"
    Address.set_default_address(address.id, address.client)  # updates the object in the db
    print address.default # will print False
    address.refresh_from_db()
    print address.default # will print True

See the docs on refreshing objects from the database for more details.