Hi,
I am about to build my first web application using the MVC pattern. Now I am
wondering which might be the best way to initialize both a model and a
presenter based on the model and its state.
My controller should look like this:
#########
model = Models.ModelFactory(cgi_parameters)
view = Views.ViewFactory(model)
view.Display()
#########
The factory method ModelFactory would check the parameters and return an
appropriate model:
########
def ModelFactory(params):
valid_models = dict(location=Location, prices=Prices, booking=Booking)
return valid_models[params['type']](**params)
class Location:
...
class Prices:
...
class Booking:
...
########
But I am stuck with the ViewFactory method. Since the appropriate view depends
on both the model's class (type) and state, I am not sure how to implement
this. I could do it the ugly way:
########
def ViewFactory(model):
if (model.__class__ == 'Booking' and model.state == 'new'):
view = new NewBooking()
elsif (model.__class__ == 'Booking' and model.state == 'review'):
view = new BookingReview()
...
return view
class LocationView:
...
class NewBooking:
...
class BookingReview:
...
class BookingConfirmation:
...
########
But there must be a better way. Could you give me a hint?
Thanks,
Jan
--
A common mistake that people make when trying to design something completely
foolproof is to underestimate the ingenuity of complete fools.
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