Re-populating form with 2 dimensional indexed array

[eluser]20000RPM[/eluser]
Hi,

I've got a form which can have an arbitrary number of fields (in reality probably very few: less that 5).

The posted array might look like this:

Code:

expenses[0][name] => 'Travel',
expenses[0][amount] => '£5.00',
expenses[1][name] => 'Equipment',
expenses[1][amount] => '£15.00'

Now, how can I repopulate the form using set_value()? I already can validate the data using a callback like this:

Code:

array(
    'field' => 'expenses[]',
    'label' => 'Expenses',
    'rules' => 'callback__is_expense'
)

And that callback can return the array properly. But it's not repopulating the form. I'm doing this:

Code:

set_value('expenses[0][amount]');

I could take a different approach if that's the way to go.