Re: Executing validation on entry to class-based views

On Thursday, 26 September 2013 07:29:38 UTC+1, dspruell wrote:

Greetings,

I have an app with a CBV for the main functionality that I'd like to
do some validation on config settings (in settings.py) before carrying
out the view.

My particular view in this case is a FormWizard, but I'd like to know
general to any CBV; what is the correct pattern for doing this? Is
there a standard way to execute validation code upon entering a view
that allows one to access the request object (e.g. for setting
messages) and redirecting clients?

My initial thought was to override __init__() and perform it there but
IIANM it lacks self.request at that point.

What I'd like to implement:

        if not settings.SOMEAPP_SETTINGS.get('sender_address'):
            messages.error(self.request, "Configuration error:
submission sender address not found. Configure SOMEAPP_SETTINGS in
your project settings file.")
            return redirect('index')

--
Darren Spruell
phatb...@gmail.com

One way would be to override `dispatch()`.  You have access to the request there and can choose whether to call the super method to do the actual dispatching, or redirect instead.

--

DR.

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