Yes of course! :) Thank you for the help. Saved me a lot of sweat.
2009/1/16 Qian Qiao <qian.q...@gmail.com>: > > On Sat, Jan 17, 2009 at 02:02, Elliott Rosenthal > <elliott.rosent...@gmail.com> wrote: >> >> Thank you for the help so far, it really has been useful. >> If there any way you could give me a quick snippet of code to show me >> how to build a factory method? > > Let's say we have a model that models a circle, and you were to > calculate the area of the circle in your __init__ method, we can use > the following as an alternative: > > class Circle(db.Model): > centre = db.GeoPtProperty() > radius = db.IntegerProperty() > area = db.FloatProperty() > > @staticmethod > def build_circle(centre, radius): > area = math.pi * radius * radius # example of the complex calculation > return Circle(centre = centre, radius = radius, area = area) > > So when you need a circle somewhere in you code, instead of creating > it like circle = Circle(centre, radius), you do it as: circle = > Circle.build_circle(centre, radius) > > HTH > > -- Joe > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
