[jboss-jira] [JBoss JIRA] (DROOLS-1245) Document limitation of (legacy) Accumulate CE Alternate Syntax: single function with return type

[Matteo Mortari (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-1245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13274565#comment-13274565 ] 

Matteo Mortari commented on DROOLS-1245:
----------------------------------------

Changed the main description to reflect latest changes (compile-time check also when accumulate function returns an iterable/collection).

> Document limitation of (legacy) Accumulate CE Alternate Syntax: single function with return type
> ------------------------------------------------------------------------------------------------
>
>                 Key: DROOLS-1245
>                 URL: https://issues.jboss.org/browse/DROOLS-1245
>             Project: Drools
>          Issue Type: Enhancement
>          Components: docs
>    Affects Versions: 6.4.0.Final
>            Reporter: Matteo Mortari
>            Assignee: Matteo Mortari
>
> Document limitations and common pitfalls:
> h2. from+accumulate does not iterate
> This does NOT iterate over the elements of the accumulate function:
> {code:java}
> rule R when
>   $theFrom : Object() from accumulate(MyPerson( $val : name ); 
>                                           collectList( $val ) )
> then
>   list.add($theFrom);
> end
> {code}
> and in fact the binded $theFrom : Object() is the List returned by the collect list.
> While normally the "from" iterates over the element of list/iterable collections.
> {code:java}
> rule R1 when
>     $list : List( )
>     $s : Integer() from $list
> then
>     out.add($s);
> end
> {code}



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