Generate Clara rules to collect data from EDN Query Language queries.
(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)))Nothing else from clara-eav is required, but using the same type makes the libraries compatible.
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.
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 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).
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.
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