[web2py] Easy handling of subforms

[~redShadow~]

For some reason, I need to simultaneously update a bunch of records
together in the same form. Specifically, records come from different
tables but field names sometimes overlaps, this not allowing to simply
merge the standard CRUD SQLFORMs.

I like a feature in the Drupal Forms API that's specifically to solve
any sub-forming problem: tree placement of fields.

So, when you create a form like this:

    group0
      element0
      element1
    group1
      element0
      element1
      element2
      group2
        element0
        element1

then the form generator creates fields named like:

    edit[group0][element0]
    edit[group0][element1]
    edit[group1][element0]
    edit[group1][element1]
    edit[group1][element2]
    edit[group1][group2][element0]
    edit[group1][group2][element1]

grouped inside some <fieldset>s.

When the form gets submitted, vars are split (also by taking advantage
of how php parses query strings recursively) in a structure like this:

    {
      'group0' : {
        'element0' : '..some value..',
        'element1' : '..some value..',
      },
      'group1' : {
        'element0' : '..some value..',
        'element1' : '..some value..',
        'element2' : '..some value..',
        'group2' : {
          'element0' : '..some value..',
          'element1' : '..some value..',
        }
      }
    }

So, extracting trees of values becomes quite easy.

Now the question is: is there anything like this inside web2py?
I looked for it in the book and in the code, but didn't find anything..

-- 
Samuele ~redShadow~ Santi
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