Cannot refer to a unique ref with a map

[petterik]

Use case:

• I want to be able to describe 1-to-1 relationships in my schema.
• My solution is to create unique refs in my schema.

Did:

• Added an attribute :foo to my schema with both :db/valueType :db.type/ref and :db/unique db.unique/identity.
• Transacted an entity associating :foo to a map (ref)

Expected:

• :foo to associated with the reference, which is unique in the db.
• Refs can be unique and used in this way in Datomic.

Happened:

• Error: #error {:message "Expected number or lookup ref for entity id, got {:db/id 1}", :data {:error :entity-id/syntax, :entity-id {:db/id 1}}}

Code to repro:

(require '[datascript.core :as d])

(def conn (d/create-conn {:foo {:db/valueType :db.type/ref 
                                :db/unique    :db.unique/identity}}))
(d/transact conn [{:db/id 1}{:foo 1}]) ;; OK, when referencing with a number

(def conn (d/create-conn {:foo {:db/valueType :db.type/ref 
                                :db/unique    :db.unique/identity}}))
(d/transact conn [{:db/id 1}{:foo {:db/id 1}}]) ;; throws, when using a map

[tonsky]

Problem here is that DataScript does not understand ref when specified in a form of a map.

Datomic seems to allow using such maps in certain cases, so I’ll have to investigate and let DataScript do the same.

Until then, just use {:foo 1} instead.

On Sun, Mar 20, 2016 at 7:45 PM Petter Eriksson [email protected] wrote:

Use case:

• I want to be able to describe 1-to-1 relationships in my schema.
• My solution is to create unique refs in my schema.

Did:

• Added an attribute :foo to my schema with both :db/valueType :db.type/ref and :db/unique db.unique/identity.
• Transacted an entity associating :foo to a map (ref)

Expected:

• :foo to associated with the reference, which is unique in the db.
• Refs can be unique and used in this way in Datomic.

Happened:

• Error: #error {:message "Expected number or lookup ref for entity id, got {:db/id 1}", :data {:error :entity-id/syntax, :entity-id {:db/id 1}}}

Code to repro:

(require '[datascript.core :as d])

(def conn (d/create-conn {:foo {:db/valueType :db.type/ref :db/unique :db.unique/identity}})) (d/transact conn [{:db/id 1}{:foo {:db/id 1}}]) ;; throws

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