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@me.com> 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@gmail.com> 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@me.com> 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

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