If you cached the values no distinction between post or get matters. you
fetch them one-time only.
If you don't want to cache them, it's another story
Basic workflow
- requesting values
- form = FORM()
- users press submit (form.process)
- re-requesting values (your unfortunate case)
- process the values sent by the form
But, you are afraid that requesting values from db 2 times is too much
(sound like premature optimization, but anyway, let's go with it).
You did
if post_vars
process the values sent
else
fetch values
form = FORM()
This leaves you with open doors to XSRF and double submissions (not using
form.process or form.accepts).
You can still skip the fetch part if the page has been POSTed (don't need
for default values at that point), so the logic goes this way
if page is GETted
fetch values
form = FORM()
user press submit (form.process)
else (page is POSTed)
don't fetch the data
process the values from the form
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