ANN: clara-eql 0.2.1

[Jason Felice]

https://github.com/eraserhd/clara-eql

Supports ClojureScript and resolves an issue with generated code when attribute names contain periods.

clara-eql

Generate Clara rules to collect data from EDN Query Language queries (a.k.a pull expressions).
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
All data is stored in EAV triples, in clara_eav.eav.EAV records

Nothing else from clara-eav is required, but using the same type makes the libraries compatible.
Attribute 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.