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
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