"from" followed by an expression means:
Take the elements of the collection or array returned by the
expression and evaluate the rule with each element.
Since a Fact() is not a Collection(), they are all filtered away:
nothing remains, and so the query returns nothing.
If you use
$fact: Fact() from $tm.values()
and iterate over the query rows and extract the object bound to
"$fact" you'll get the Fact() things according to sort order.
-W
On 2 December 2011 10:42, Syargey <Syargey(a)tut.by> wrote:
I am still wondering why the following query doesn't work:
query sortFactsQuery1
$tm: TreeMap()
from accumulate( $f: Fact(),
init( TreeMap map = new TreeMap(); ),
action( map.put(factKey($f), $f); ),
reverse( map.remove(factKey($f)); ),
result( map ) )
$sortedFacts: Collection() from $tm.values()
end
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