clara-eql
Generate Clara rules to collect data from EDN Query Language queries.
Usage
(require '[net.eraserhead.clara-eql :as clara-eql])
(clara-eql/defrule test-query
:query
[:person/first-name
:person/last-name
{:person/supervisor
[:person/uuid]}]
:from ?eid
:where
[EAV (= e ?eid) (= a :person/uuid)]
[:test (even? ?eid)])
(defrule foo
[clara-eql/QueryResult (= root 42) (= query 'test-query) (= data ?data)]
=>
(println "Data is now: " (pr-str ?data)))
Assumptions
clara_eav.eav.EAV records
All data is stored in EAV triples, inAttribute values in the EAV triples are keywords
Well, they don't have to be keywords, specifically, but this library does not
handle Datomic-style indirection where a number represents an attribute and a
keyword is assigned with a :db/ident
property.
Many-valued Attributes
The shape of the pull result differs for many-valued attributes. clara-eql
assumes these attributes have a fact
(->EAV attr-name :db/cardinality :db.cardinality/many)
.
Identity Attributes
Identity attributes can be used for entity references, such as
[:person/uuid #uuid "3fec670d-da20-4171-a96d-e5852be05ded"]
. clara-eql
assumes identity attributes have a fact
(->EAV attr-name :db/unique :db.unique/identity)
.
License
Copyright © 2019 Jason Felice
This program and the accompanying materials are made available under the terms of the Eclipse Public License 2.0 which is available at http://www.eclipse.org/legal/epl-2.0.
This Source Code may also be made available under the following Secondary Licenses when the conditions for such availability set forth in the Eclipse Public License, v. 2.0 are satisfied: GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version, with the GNU Classpath Exception which is available at https://www.gnu.org/software/classpath/license.html.