It seems to me this works
event_id = int(request.vars.event_id) #this does not work
but this does not because auth.user should be auth.user.id.
if db((db.attendance.event==event_id) &
(db.attendance.user==auth.user)).select():
db((db.attendance.event==event_id) &
(db.attendance.user==auth.user)).delete()
Your code is very good but we can make it much faster and shorter. I
will send some examples later, in case you want to use it.
Massimo
On Aug 10, 12:46 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
> Sorry, I will answer by tomorrow.
>
> Massimo
>
> On Aug 10, 8:56 am, __future__ <wrigh...@gmail.com> wrote:
>
> > ...bump
>
> > On Aug 9, 6:50 pm, __future__ <wrigh...@gmail.com> wrote:
>
> > > I have a lot of this working but I am stuck on getting individually
> > > submitted values from the request...
>
> > > the model:http://pastebin.com/d2ddf4718
> > > the controller:http://pastebin.com/d74b1a1e2
> > > the 'tonight' view:http://pastebin.com/d6746076d
>
> > > the tonight view and the create view are working... the view only
> > > shows the latest event for that day for all users... it also provides
> > > a button for attend/unattend for each event.
>
> > > It is the toggle_attendance function I am having trouble with. I am
> > > missing something very fundamental about using POST variables in
> > > web2py. I looked around in the docs (at the least the latest
> > > chapters 6,7,8). Looking at the view should reveal what it is i am
> > > trying to do. I just want to use the event_id value in the POST to
> > > check the attendance table for an existing record for that event/user
> > > combo and delete it if it is there (unattend) or add it if it is not
> > > (attend).
>
> > > On Jul 29, 10:13 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > > > If you build the model, and empty actions which a docstring explaining
> > > > what the should do, I can help filling the blanks.
>
> > > > On Jul 29, 8:37 pm, __future__ <wrigh...@gmail.com> wrote:
>
> > > > > I would like it to be functionally as similar to the original as
> > > > > possible (with maybe a couple of enhancements :-) )
>
> > > > > I think in the building of it, people will really appreciate a lot of
> > > > > the things that web2py does for you in the process.. I personally find
> > > > > seemingly little things like the handling of routes and default views
> > > > > extremely helpful in the process of actually making/testing things.
>
> > > > > I was actually wondering about the latest field as I was posting all
> > > > > of those examples... It has been almost a year since I walked through
> > > > > thatDjangotutorialand I think it had something to do with the
> > > > > archive or maybe the following behavior.. In any case, until I look
> > > > > into it, I can't really argue for its purpose... though I think it was
> > > > > necessary for some reason.
>
> > > > > I don't think GAE is really important to this example. Not everything
> > > > > worth doing is going to be GAE friendly and I think this is a good
> > > > > case study for some of the features it exposes like the
> > > > > '"twitteresque" following behavior, etc..
>
> > > > > I also like that it givesDjangopeople a 1-1 comparison of how to
> > > > > accomplish similar behavior with a different philosophy (as you say).
>
> > > > > Thanks for offering your help.
>
> > > > > On Jul 29, 8:20 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > > > > > This is an excellent idea and you can count on my help.
>
> > > > > > One decision you need to make is how close you want to the
> > > > > > "translation" to be to the original.
> > > > > > - do you need the same actions? (I assume yes)
> > > > > > - can you use joins? (I assume yes, but in this case it will not run
> > > > > > on GAE)
> > > > > > - do you need the same tables? (probably yes)
> > > > > > - do you need the same table and field names? (I would change some
> > > > > > of
> > > > > > them)
> > > > > > - Why do you need the latest field? I think this is redundant since
> > > > > > you can select the latest using the post date.
> > > > > > - How should users search for other users to follow? (by name, by
> > > > > > email, by secret code)
>
> > > > > > On Jul 29, 7:44 pm, __future__ <wrigh...@gmail.com> wrote:
>
> > > > > > > Thank you for the quick reply!
>
> > > > > > > I think this is starting to click a little more for me. I have
> > > > > > > purchased the book and I have the updated chapters you posted for
> > > > > > > 6,7,8 that I have been using as a reference.
>
> > > > > > > Unfortunately, my mind struggles with abstractions unless
> > > > > > > presented
> > > > > > > with a concrete example. It is probably why I am still a mediocre
> > > > > > > programmer after all of these years :)
>
> > > > > > > Could you possibly assist me with some more hints along these
> > > > > > > lines...
> > > > > > > you can check out the working end result of all of that djangoese
> > > > > > > at:
>
> > > > > > >http://startthedark.com
>
> > > > > > > My ultimate goal is to rebuild that app in web2py and describe the
> > > > > > > process in detail along with screencasts. This startthedark was a
> > > > > > > project based on adjangoscreencasttutorialseries called "Django
> > > > > > > from the ground up" that I found very useful when learningDjango.
>
> > > > > > > Thanks for all of the help.
>
> > > > > > > __future__
>
> > > > > > > On Jul 29, 7:11 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > > > > > > > These are good questions. web2py does not have something
> > > > > > > > likeDjango
> > > > > > > > managers and you have to achieve the same goal differently.
> > > > > > > > This is
> > > > > > > > because of different in design philosophy.
>
> > > > > > > >Djangohas an ORM, web2py has a DAL. InDjangoa model maps a table
> > > > > > > > into an object so you can override the methods of that object.
> > > > > > > > web2py prefers to be a lower lever than that. the web2py DAL
> > > > > > > > expressions map 1-to-1 into SQL queries. For example we do not
> > > > > > > > have a
> > > > > > > > save() methods. We do have an insert() method. You cannot
> > > > > > > > override it
> > > > > > > > because it does not belong to the table (model) but it belong
> > > > > > > > to the
> > > > > > > > database. (technically you could override it but you would be
> > > > > > > > doing
> > > > > > > > for all tables).
>
> > > > > > > > What inDjangoyou achieve by modifying the model, in web2py you
> > > > > > > > achieve my modifying the forms. Forms can be associated to two
> > > > > > > > functions: onvalidation, onaccept. The former is executed after
> > > > > > > > validation before any database IO, the latter is executed after
> > > > > > > > database IO.
>
> > > > > > > > You can define these functions in the model (they are just
> > > > > > > > functions,
> > > > > > > > not class methods) but you still need to be specific about
> > > > > > > > which form
> > > > > > > > they apply to (onvalidation=...).
>
> > > > > > > > Hope this helps.
>
> > > > > > > > Massimo
>
> > > > > > > > On Jul 29, 3:18 pm, __future__ <wrigh...@gmail.com> wrote:
>
> > > > > > > > > Looking at my post, I can see where not knowingDjangowould be
> > > > > > > > > an
> > > > > > > > > impediment to understanding... :)
>
> > > > > > > > > Let me try again (and please bare with me because I am *not*
> > > > > > > > > an expert
> > > > > > > > > onDjango).
>
> > > > > > > > >Djangohas these things called Managers:
>
> > > > > > > > >http://docs.djangoproject.com/en/dev/topics/db/managers/
>
> > > > > > > > > from theDjangodocs:
>
> > > > > > > > > class Manager
>
> > > > > > > > > A Manager is the interface through which database query
> > > > > > > > > operations are
> > > > > > > > > provided toDjangomodels. At least one Manager exists for
> > > > > > > > > every model
> > > > > > > > > in aDjangoapplication.
>
> > > > > > > > > You can create your own Managers and use them with your
> > > > > > > > > models. You
> > > > > > > > > can create custom QuerySets (filters basically) and use them
> > > > > > > > > with your
> > > > > > > > > Managers.
>
> > > > > > > > > In the example I gave, he creates a function today():
>
> > > > > > > > > from datetime import datetime, timedelta
> > > > > > > > > def today():
> > > > > > > > > now = datetime.now()
> > > > > > > > > start = datetime.min.replace(year=now.year,
> > > > > > > > > month=now.month,
> > > > > > > > > day=now.day)
> > > > > > > > > end = (start + timedelta(days=1)) - timedelta.resolution
> > > > > > > > > return (start, end)
>
> > > > > > > > > Then a custom QuerySet (EventQuerySet) that extends the base
> > > > > > > > > QuerySet
> > > > > > > > > with a today method which uses the function he defined above.
>
> > > > > > > > > self.filter(creation_date__range=today()) # __range is part
> > > > > > > > > of the
> > > > > > > > >djangofiltering syntax
>
> > > > > > > > > Then he creates a custom Manager (EventManager) and assigns
> > > > > > > > > it to
> > > > > > > > > 'objects' in his model:
>
> > > > > > > > > class Event(models.Model)
> > > > > > > > > #....
> > > > > > > > > objects = EventManager()
>
> > > > > > > > > So now when he calls Event.objects he is really calling an
> > > > > > > > > instance of
> > > > > > > > > the EventManager()
>
> > > > > > > > > He does one more thing though.. All models have a default
> > > > > > > > > save method
> > > > > > > > > which is called explicitly to commit changes. He overrides
> > > > > > > > > the
> > > > > > > > > inherited default save method with this one:
>
> > > > > > > > > def save(self, **kwargs):
> > > > > > > > > Event.objects.filter(latest=True,
> > > > > > > > > creator=self.creator).today().update(latest=False)
> > > > > > > > > super(Event, self).save(**kwargs)
>
> > > > > > > > > So now whenever an Event object is saved, this code will
> > > > > > > > > execute
> > > > > > > > > regardless of where it happens because save is a model method.
>
> > > > > > > > > I think I explained that correctly (possibly not well :)
>
> > > > > > > > > What would be the best (or most DRY) way to do something like
> > > > > > > > > this in
> > > > > > > > > web2py?
>
> > > > > > > > > Thanks again to all for indulging my questions...
>
> > > > > > > > > On Jul 29, 1:51 pm, Fran <francisb...@googlemail.com> wrote:
>
> > > > > > > > > > On Jul 29, 6:51 pm, __future__ <wrigh...@gmail.com> wrote:
>
> > > > > > > > > > > So can I create a custom filter like the EventQuerySet in
> > > > > > > > > > > the example
> > > > > > > > > > > and then apply it in the controller? I assume I will
> > > > > > > > > > > have to use this
> > > > > > > > > > > anywhere an event might get an update? Can I use it with
> > > > > > > > > > > crud?
>
> > > > > > > > > > I don't quite follow the example (I'm not familiar
> > > > > > > > > > withDjango) but
> > > > > > > > > > what I think you're looking for is:
> > > > > > > > > > crud.settings.create_onvalidation = lambda
>
> ...
>
> read more »
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