Re: [rules-users] Facts - One to Many

As you describe it, here's the way to refer to a particular medication: Patient( $meds: medications ) Medication( drugCode == "55749-003-01" ) from $meds This rule determines whether the patient has this particular medication. There are other operators that might be useful: Medication( drugCode str[startsWith] "55749-003" ) from $meds Inserting the Medication objects with a backlink to the Patient can simplify rule evaluation, which may depend on the number and complexity of the rules. Compare: Patient( $meds: medications ) Medication( drugCode == "55749-003-01" ) from $meds Medication( drugCode == "55799-565-01" ) from $meds with $p: Patient() Medication( drugCode == "55749-003-01", patient == $p ) Medication( drugCode == "55799-565-01", patient == $p ) Much depends on the number of facts you'll need to process. To answer your question, "Takes" was a class name I invented to refer to the relation as an object, and "this" is Java's "this", referring to the matching object. -W On 02/01/2014, Ray Hooker <ray.hooker(a)me.com&gt; wrote: > Wolfgang, So in your case you were envisioning the possibility of a Takes > object that matched between a particular medication and the patient. > Actually we are fairly close in the case of medications. > > As you probably know MongoDB allows for documents. In this case, the > patient’s document contains subdocuments. In the case of medications, this > semantically means “as of the date of this patient document, the patient is > taking the following medicine listed by the applicable code and text > description”. > > When read from the DB, you actually have a Java object Patient (or “Record”) > that has a method “medications” that returns a set of “Medication” objects. > The parent knows about the medication through the set “medications”. I > certainly could assert each patient/ record and for each of those assert > each subdocument, inserting a key back to the parent. > > So the rule would need to identify, for example, any case where a particular > had a medication object where the drug code matched a particular code or set > of codes. > > Any suggestions are appreciated. Also in the example below, is “Takes” a > function and what does “this” refer to? > > Thanks, > > Ray > On Jan 2, 2014, at 2:01 AM, Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; wrote: > >> Ideally, a relation is represented by separate objects. Then you might >> have >> a rule >> >> $p: Patient() >> $p: Takes( patient == $p, $m: medication ) >> Medication( this == $m ) >> >> and this rule will fire for each medication of the patient. >> >> Answering such questions without details about the actual data model >> is impossible. >> >> -W >> >> On 02/01/2014, Ray Hooker <ray.hooker(a)me.com&gt; wrote: >>> I am trying to figure out how to work with an existing model. The data >>> is >>> in >>> MongoDB with embedded documents. It is about patients would have >>> sub-documents. For example. An individual patient may have multiple >>> allergies. Also a patient has multiple medications. So it is as >>> follows: >>> >>> - Patient.medications ---> multiple Medication objects >>> >>> So I see where you have a simple one to one. Typically perhaps you >>> might >>> have the medication record know that it is associated with the patient, >>> but >>> that is not how it is currently organized. So the question is can I >>> write >>> rules when patients.medications returns a set/ collection of medications >>> associated with the patient. I want to write a rule such as "if a >>> patient >>> is >>> taking medication=xxx...." >>> >>> Thanks for your help. >>> >>> Ray Hooker >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users