On 3/22/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>
> I'm trying to be too clever with my python again. Maybe someone
> will see an easier way to do this.
>
> I've got a set of DB classes with very similar structure, and I
> want to write a single CRUD controller that will handle them
> all. The only things that need to be different for the different
> classes are (1) the db class, (2) the display/edit forms, and
> (3) a display text label. (1) and (3) are easy, but (2) is
> giving me some trouble, because the "normal" pattern is to
> reference the form in an @validate decorator.
>
> What I'm trying to do is something like:
>
> class CRUD(Controller):
>
> def __init__(self, dbclass, form, label):
> ....
> self.__class__.save =
> expose()(validate(form=self.editform)(error_handler(self.__class__.edit)(self.__class__.save)))
>
> @expose(.templates.editform)
> def edit(self, id, tg_errors=None, **formdata):
> ....
> formdata = dbclass.get(id)
> ....
> return dict(form=self.editform, formdata=formdata,
> label=self.label)
>
> def save(self, id, label=None):
> ....
>
> class AccountsController(CRUD): pass
> class EntriesController(CRUD): pass
>
>
> class Root(RootController):
>
> accounts = Accounts(Account, accountform, 'Account')
> entries = EntriesController(Entry, entryform, 'Entry')
>
>
> The overly tricky bit should be obvious, in the init method. This works
> great except for the fact that the error_handler isn't getting recognized.
> When there's a validation error I get the following traceback:
>
> File
> "/var/www/finance.bitdance.com/moneytracker/lib/python2.4/TurboGears-1.0.1-py2.4.egg/turbogears/errorhandling.py",
> line 110, in run_with_errors raise NotImplementedError("Method
> %s.%s() has no applicable "
> NotImplementedError: Method FlowTypeController.add() has no applicable
> error handler.
>
> I presume I can work around this by defining the save method in the
> subclass and decorating it, but I hate to have to write the redundant
> code :). Is there some way to set the error handler (and the
> validator, for that matter) other than the decorator?
I did something similar myself in a different thread, which might help.
http://groups.google.com/group/turbogears/browse_thread/thread/2a9cca20dff1f10c
It's just the forms without the crud, but the principle is the same.
There's also a thread thread where Alberto taught me about im_func,
which I still don't understand but seems to be important for this kind
of thing.
http://groups.google.com/group/turbogears/browse_frm/thread/43cc8c5123160a66/d9ddffce90dfc6cb
I'm going to be doing a very similar style of basic crud controller in
the next couple of weeks, if you want to share code.
To answer your specific question, yes there is a way to specify an
error handler without a decorator. I forget the specific details but
IIRC it is literally as easy as checking for tg_errors, and then
redirecting to the controller you want to use, whilst passing on
tg_errors. Check the source of error_handler to see what it actually
does.
Ed
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