[rules-users] Is it possible to Iteriate over a list of string values ?

[Michael Anstis]

The Expert documentation states "The expression used to define the object
source is any expression that follows regular MVEL syntax." Therefore "from"
should be able to use the MVEL syntax for arrays ["one", "two", "three"]
however I've not tried and never seen it used. Normally people use "from" to
iterate over a dynamic list created elsewhere (another Fact pattern, a
global etc). Since you say you need to handle "variable collections" I'd
have thought the latter use-case more suitable for yor needs. something
like:-

when
    $pch : ParsedCellHolder( )
    $val : String( ) from $pch.getStrings( )
then
    insert( new Fact( $val ) );
end

Of course one begs to ask why you don't simply insert the individual values
into WM as the spreadsheet is parsed?

You'll be doing something like that to either construct the static MVEL in
your example or a list.

With kind regards,

Mike

On 9 March 2011 06:19, groovenarula <gnarula1 at la-z-boy.com> wrote:

> Hello all,
>
> In one of my use cases, I need to insert a variable collections of facts
> into working memory in order to be able to test for those values later :
>
> So I was wondering if there's a way to do something like this
>
>    when
>        $vals : String() from [ "A 12345", "B 45678", "C 8695" ]
>    then
>         insert ( new Fact ( $vals ) );
>
> With the intention that the rule will fire 3 times and insert the 3 new
> facts with the values " A 12345" and "B 45678" and "C 8695".
>
> Is this possible using rules or do I have to resort to using functions. The
> problem I'm trying to overcome is to see if there's a way to get the  "A
> 12345", "B 45678", "C 8695"  from a single cell of a spreadsheet.
>
> Thanks in advance,
> G
>
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