Thanks a lot for that detailed explanation...
Why do we use args instead of request.vars? Wouldn't using the
request vars allow using named values in the controller? It is not
the biggest thing in the world but whenever I see something like args
(0), I feel like I am reading perl. I hate reading perl. :)
__future__
On Aug 11, 9:43 am, mdipierro <mdipie...@cs.depaul.edu> wrote:
> > if db((db.attendance.event==event_id) &
> > (db.attendance.user==auth.user.id)).delete():
> > return 'Not Attending'
> > else:
> > db.attendance.insert(event=event_id, user=auth.user.id)
> > return 'Attending'
>
> > This obviously works but looks backwards to me for some reason. What
> > am I missing?
>
> db().delete() returns the number of affected records. If it returns 0
> then there are no records to delete and it assumes you meant to insert
> one, not delete one. This is the same as your code. I just removed the
> explicit check.
>
> > In the view:
>
> > <button id="x{{=item.event.id}}"onclick="ajax(
> > '{{=URL(r=request,f='toggle_attendance',
> > args=item.event.id)}}',[],'x{{=item.event.id}}');">
>
> > Can you step me through what is going on here.
>
> This is a bit tricky. Say you have an item.event.id==1. Then it make a
> button
>
> <button id="x1" onclick="ajax('/yourapp/default/'toggle_attendance/1',
> [],'x1')">...</button>
>
> that when clicked sends anajaxrequest to /yourapp/
> default/'toggle_attendance/1. The /1 implies request.args(0)=1. []
> means it passes no request.vars. The last argument ofajax(...,'x1')
> means that the value returned by theajaxfunction goes into the
> innerHTML of the tag with id=='x1'.
> So basically when you click the button is calls the server, the server
> creates or deletes the record and returns the new name for the button.
>
> > I'm not sure
> > understand how the helpers work withajax. I get that you are
> > creating a 'button' and that it is passing the event.id to the toggle
> > function. I guess my confusion is still the confusion about how the
> > toggle is deciding what to return. It seems like if it successfully
> > deletes the attendance record, it returns that there IS an attendance,
> > and if it inserts an attendance record it returns that is NOT an
> > attendance. This is not what actually happens so why am I reading it
> > this way? I also don't understand where what is actually returned is
> > represented in the view.
>
> Sorry. I had a type "Unattending" instead of "Attending".
>
> Hope this makes more sense.
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