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