On Friday, January 20, 2017 at 9:23:37 AM UTC-8, Val K wrote:
>
> form.vars appear only after form.process()  call (process() - 
> filter/convert/format/validate request.vars to form.vars)
> you have variants :
> 1. *before *form creation  - modify field.default
> 2. *before* form.process()  -  modify request.vars - 
> request.vars.PostDate=... 
> 3. pass your own set of vars  -  form.process(vars=myvars)
> 4. use form.process( onvalidation=myvalidation_fun) to modify form.vars  
> *after 
> *basic validation passed but before any db actions
>  
>  
>
>
But what about this passage in the book?

<URL:http://web2py.com/books/default/chapter/29/07/forms-and-validators#Pre-populating-the-form>
Pre-populating the form

It is always possible to pre-populate a form using the syntax:

1

form.vars.name = 'fieldvalue'

Statements like the one above must be inserted after the form declaration 
and before the form is accepted, whether or not the field ("name" in the 
example) is explicitly visualized in the form.

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