Simon Willison’s Weblog

Multiple inheritance of newforms and modelforms. If you ever see “Error when calling the metaclass bases metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases” when trying multiple inheritance with newforms and modelforms, here’s a scary solution I found.

# 12th April 2008, 12:54 pm / django, inheritance, metaclasses, modelforms, multipleinheritance, newforms, python

queryset-refactor changeset 7126. Malcolm just checked model inheritance in to the queryset-refactor branch, with full documentation and unit tests. People have been requesting this for ages.

# 18th February 2008, 9:46 am / django, inheritance, python, querysetrefactor

Transitioning from Java Classes to JavaScript Prototypes. Peter Michaux shows how JavaScript’s prototypal inheritance can run rings around traditional Java-style classes once you figure out how to take advantage of it.

# 10th February 2008, 3:10 pm / classes, inheritance, java, javascript, pete-michaux, prototypalinheritance