If the following explanation is correct it is a big coincidence
because I have just been looking at this behaviour.
When a form is submitted, if there is no parameter for a field then
one of 2 things happen (simplified):
If it is NOT a checkable form control (checkable=check box or radio
button) then the original form value is used. In the case of an
existing record, this will be the value in the existing record. In the
case of a new record then any defailt will be used.
If it IS a checkable form control then it is impossible to distinguish
between a missing parameter and an unchecked control because CGI
doesn't send "mycheckbox=off" - it just doesn't send anything. So to
be able to set a boolean field to false, web2py must say
missing==unchecked.
In your case, you set checkboxes on page2 and everything is fine.
When you amend page 1 and submit, no checkboxes are present so web2py
sets the associated fields to False. You go back to page 2 and, lo and
behold, all the checkboxes are unchecked.
The only solution, given the current setup, is that any fields
represented as checkable controls but not displayed in the current
form must be set up in the form as "hidden" so that checked fields are
returned even if they are not displayed.
I think it should be possible to create the "hidden" fields
automatically in SQLFORM/FORM, although supporting "custom
forms" (where a developer may not include a field that the standard
SQLFORM would include) could be a complication.
On Nov 21, 6:20 am, "Wes James" <[EMAIL PROTECTED]> wrote:
> I have an app that on one page I have a set of fields (first 20 fields
> of say 50) I have manually placed. All saves well and when I go to
> another page and come back all is well.
>
> On a separate page, I edit the rest of these fields. Part of these
> are check box fields and some others including textarea fields.
>
> When I save the data on this page - all is well.
>
> I then go back to the first page and make a change and save the data -
> fine, but if I go back to the page with the check boxes, they are all
> cleared out - I look in the DB in admin area and yes, they are all set
> to False. But the textarea fields do not do this on this page - they
> keep their data just fine.
>
> So I created a test page and made a controller like I already have:
>
> form=t2.create(db.student)
> return dict(form=form)
>
> and then in a test.html do {{=form}
>
> I then save the page with a check box selected - fine - that works.
>
> I then go back to my first page and make a change and save. Go back
> to the test page and the check box is cleared.
>
> Why is it doing this?
>
> thx,
>
> -wj
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