[Seaside] Executing form callbacks within a block

[Esteban Maringolo]

Hi Joachim,

Thanks for pointing that out, I forgot about Mold. It's not exactly
what I needed, but having a special kind of callback is something I
could certainly use. I did that for specific purposes but never for
changing the processing priority.

Thanks again!


Esteban A. Maringolo

On Thu, May 20, 2021 at 11:30 AM jtuchel at objektfabrik.de
<jtuchel at objektfabrik.de> wrote:
>
> Esteban,
>
> not sure if I understand correctly, but I would like to point you to an
> idea I got from a Form validation framework called mold
> (https://github.com/grype/Seaside-Mold
> <https://github.com/grype/Seaside-Mold>). Your hidden input idea is
> going to carry you quite far, but you can even make it a bit "safer" by
> creating a special callback that has a higher priority than the other
> action  callbacks.
>
> Just subclass WAActionCallback and implement #priority to return a value
> lower than 5 to make sure it is executed before the action callbacks
> (but after the value callbacks).
>
> This will be a bit safer than just relying on the order of the action
> callbacks in your form (which might be enough already).
>
> HTH
>
> Joachim
>
>
>
>
>
> Am 20.05.21 um 16:10 schrieb Esteban Maringolo:
> > Well..
> >
> > I'm not writing the values directly to the database, but I'm using
> > GLORP in between.
> > Glorp detects changes and at the end of a "unit of work" (kinda
> > transaction) it creates the corresponding statements to
> > write/update/delete rows in the database. But in order to do that it
> > has to know the object "state" before starting doing mutations on it.
> >
> > So what I finally did was to have a hidden input as the first callback.
> >
> > A super simplified version, without validations and whatnot is like this:
> >
> > html form: [
> >    html hiddenInput callback: [self db beginUnitOrWork. self db
> > register: self model].
> >    html textInput on: #name of: self model.
> >    html submitButton callback: [self db commitUnitOfWork]
> > ]
> >
> > Regards!
> >
> > Esteban A. Maringolo
> >
> > On Wed, May 19, 2021 at 10:59 PM Jupiter Jones <jupiter.jones at mail.com> wrote:
> >> To be clearer… :)
> >>
> >> No callback on the submit button.
> >>
> >> html form callback: [
> >>          self beginTransaction.
> >>          “Update database from #name and #age fields”
> >>          self commitTransaction
> >> ]
> >>
> >>> On 20 May 2021, at 11:55 am, Jupiter Jones <jupiter.jones at mail.com> wrote:
> >>>
> >>> It’s been a while since I’ve done this, but if you have a callback on the form itself, which handles validation and if valid, starts a transaction, moves the data from the temporary variables used by the web form to the database, then commits.
> >>>
> >>> I’m guessing from the question that you may have bound your inputs directly to database objects that will revert their value when you beginTransaction?
> >>>
> >>>> On 20 May 2021, at 11:18 am, Esteban Maringolo <emaringolo at gmail.com> wrote:
> >>>>
> >>>> Hi all,
> >>>>
> >>>> I have a situation where I want to execute _ALL_ the callbacks of the
> >>>> inputs in the form within a particular block (basically, a DB
> >>>> transaction).
> >>>>
> >>>> html form: [
> >>>> html textInput on: #name of: self.
> >>>> html textInput on: #age of: self.
> >>>> html submitButton
> >>>> ]
> >>>>
> >>>> I want to execute the three callbacks within something else, or at
> >>>> least have the option to execute something before the first callback
> >>>> executes and ensure something gets executed after the last one is
> >>>> executed.
> >>>>
> >>>> I know it involves fiddling somehow with
> >>>> WACallbackProcessingActionContinuation, but it's not fully clear if I
> >>>> could do this.
> >>>>
> >>>> The hacky alternative would be to have a hidden field that does start
> >>>> the tx and the submit / cancel commits or cancels it.
> >>>>
> >>>> html form: [
> >>>> html hiddenInput callback: [self beginTransaction].
> >>>> html textInput on: #name of: self.
> >>>> html textInput on: #age of: self.
> >>>> html submitButton
> >>>>    callback: [self commitTransaction];
> >>>>    value: 'Submit'.
> >>>> ]
> >>>>
> >>>> But in this case I'd have to keep the tx "outside" of the form, and
> >>>> I'd like to wrap everything in a single block.
> >>>>
> >>>> Is there a way to do this with Seaside?
> >>>>
> >>>> Thanks!
> >>>>
> >>>> Esteban A. Maringolo
> >>>> _______________________________________________
> >>>> seaside mailing list
> >>>> seaside at lists.squeakfoundation.org
> >>>> http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside
> > _______________________________________________
> > seaside mailing list
> > seaside at lists.squeakfoundation.org
> > http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside
>
>
> --
> -----------------------------------------------------------------------
> Objektfabrik Joachim Tuchel          mailto:jtuchel at objektfabrik.de
> Fliederweg 1                         http://www.objektfabrik.de
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