when you redirect you get a new request object so you could pass the
data to the new request.vars with:
URL(r=request, f='add_2', vars={'x':request.vars.x,
'y':request.vars.y})
or simply:
URL(r=request, f='add_2', vars=request.vars)
Probably better to pass temporary data in vars than store in session.
Richard
On Oct 6, 5:26 am, devnull <ache...@gmail.com> wrote:
> Below is the difficulty I was having getting request.vars to the
> target of the redirect. [add] redirects to [add_2], and when it does,
> request.vars doesn't have .x and .y ... instead I find myself stuffing
> x and y into the session explicitly and then pulling them out in
> [add_2] also explicitly.
>
> Is there something in the framework that handles this? (I feel like
> I'm missing something only a newbie would miss). :-) .... maybe
> [redirect] or [URL] takes another argument that I don't know about
> yet... I hope I've freed you from the notion that I know what I'm
> doing :-P
>
> def add():
> form=SQLFORM.factory(
> Field('x','double',
> requires=IS_FLOAT_IN_RANGE(
> 0,500,
> error_message='number between 0 and 500 required')),
> Field('y','double',
> requires=IS_FLOAT_IN_RANGE(
> 0,100,
> error_message='number between 0 and 100 required')))
> if form.accepts(request.vars, session):
> session.x = request.vars.x
> session.y = request.vars.y
> redirect(URL(r=request,f='add_2'))
> return dict(form=form)
>
> def add_2():
> x=session.x
> y=session.y
> sum=float(x)+float(y)
> return dict(x=x,y=y,sum=sum)
>
> On Oct 5, 11:31 am, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > Thank you devnull,
>
> > some answers below:
>
> > On Oct 5, 10:14 am, devnull <ache...@gmail.com> wrote:
>
> > > Hello all. Just discovered web2py and I think it's great. I wish we
> > > were using it here at work, and so do some of my co-workers.
>
> > > I have created a little form as an exercise for myself and I came up
> > > with some questions.
>
> > > It's likely that some of the things I'm wondering about are handled by
> > > the framework and I just don't know it yet...
>
> > > ... and the rest of the stuff is probably telltale stylistic noob-ness
> > > that I hope you'll point out.
>
> > > At the bottom is the controller and view for my form. There's no model
> > > yet. The form just adds two values, x and y. Here are the questions.
>
> > > 1. The basic structure of the form is defined in the controller part.
> > > I did this so I could use the 'requires' argument to the INPUT method
> > > to specify a validator. Is this ok? The reason I ask is it feels like
> > > I'm putting view stuff in the controller when I say things like TABLE
> > > and TR...
>
> > You can do
> > form=SQLFORM.factory(Field('x',double')),Field('y','double')))
>
> > and in view
> > {{=form.custom.begin}}
> > {{=form.custom.widget.x}}
> > {{=form.custom.widget.y}}
> > {{=form.custom.submit}}
> > {{=form.custom.end}}
> > then insert the HTML you need in the view.
>
> > > 2. I wanted a more specific error message for each field which uses an
> > > is-float-in-range validator ... But is there a way to refer to the
> > > actual max and min without repeating it in the string? Something like
> > > $max and $min?
>
> > No, there is not. We could add it. If we do it would be %{minimum}s %
> > (maximum)s. Pros/Cons?
>
> > > 3. At the end of the controller, am I making a mistake by passing x
> > > and y explicitly? Are they also hiding inside form and can I extract x
> > > and y from the form in the view html?
>
> > You are not but form.vars.x is available inside the view since you are
> > passing the form.
>
> > > 4. Would it be a better practice to redirect the user to another page
> > > for the result instead of doing everything on the same page? I tried
> > > this but had some difficulty getting x and y in the second page for
> > > processing (adding).
>
> > I like to redirect on accept. In this case there is no different but
> > you may have multiple objects in one page that depend on one another.
> > Without an explicit redirection it ma be difficult to keep track of
> > their state.
>
> > > 5. Do you have any other advice?
>
> > No. It seems to me you know aht you are doing.
>
> > > Looking forward to learning from you all. Thanks in advance!
>
> > > controller:
>
> > > def form_example():
> > > form=FORM(TABLE(
> > > TR('x',
> > > INPUT(_type='text',_name='x',
> > > requires=IS_FLOAT_IN_RANGE(
> > > 0,500,
> > > error_message='number between 0 and 500
> > > required'))),
> > > TR('y',
> > > INPUT(_type='text',_name='y',
> > > requires=IS_FLOAT_IN_RANGE(
> > > 0,100,
> > > error_message='number between 0 and 100
> > > required'))),
> > > TR('',INPUT(_type='submit',
> > > _value='add'))))
> > > sum = x = y = ''
> > > visibility = 'hidden'
> > > if form.accepts(request.vars, session):
> > > sum = float(request.vars.x) + float(request.vars.y)
> > > visibility = 'visible'
> > > return dict(form = form,
> > > sum = sum,
> > > x = request.vars.x,
> > > y = request.vars.y,
> > > visibility = visibility)
>
> > > view:
>
> > > <h1>form example</h1>
> > > {{=form}}
> > > <table style="visibility:{{=visibility}}">
> > > <tr>
> > > <td>Most recent x entered</td>
> > > <td>{{=x}}</td>
> > > </tr>
> > > <tr>
> > > <td>Most recent y entered</td>
> > > <td>{{=y}}</td>
> > > </tr>
> > > <tr>
> > > <td>sum</td>
> > > <td>{{=sum}}</td>
> > > </tr>
> > > </table>
>
>
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