Edson Tirelli-3 wrote: > > If you have only one or two rules using "from $collection", you are > probably ok. If you have more, the "from" will probably be much heavier > than > inserting facts into the working memory (assuming not all of your "from" > conditions will be shared among rules) by the reasons stated by Thomas, > even > if you are not modifying facts. >
My parent does have a number of child collections with unidirectional relations. So my rules often make use of them. Making the relations bidirectional would only serve to optimize rules. Something to keep in mind if we'd run into performance problems. Edson Tirelli-3 wrote: > > Also, remember you can negate operators: > Parent( collection contains $child ) > Parent( collection not contains $child ) > That is more efficient than composing "exists"/"not" and "from". > True, but "children not contains $child" expects to have the Child bound in a previous condition, implying (to my understanding) that "a" child must be present to match the condition, while this might not and, in my rule, mustn't be the case at all. Evert -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Accessing-collections-in-conditional-statements-inside-outside-working-memory-tp905005p912612.html Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list [email protected] https://lists.jboss.org/mailman/listinfo/rules-users
