When I eval this code in lighttable:
(ns app.core
(:require [datomic.api :refer [q] :as d]
:reload-all))
(defn add-person
[conn id]
(d/transact conn [{:db/id #db/id[:db.part/user -1000001]
:person/id id}]))
I get:
clojure.lang.ExceptionInfo: No reader function for tag id
core.clj:4327 clojure.core/ex-info
Anyone knows what is going on?
This tutorial is attributed to stuart halloway and Bobby Calderwood:
(use :reload 'datomic.samples.repl)
(easy!)
(def conn (scratch-conn))
;; in data, use data literals for tempids
(def tx-data [{:db/id #db/id[:db.part/user]
:db/doc "Example 1"}])
(transact conn tx-data)
;; in code, call tempid to create tempids
(let [id (tempid :db.part/user)
doc "Example 2"]
(transact conn [{:db/id id :db/doc doc}]))
;; same argument applies to functions:
;; use #db/fn literals in data
;; use Peer.function or d/function in code
;; broken, uses db/fn literal in code
(transact conn [{:db/id #db/id [:db.part/user]
:db/ident :hello
:db/fn #db/fn {:lang "clojure"
:params []
:code '(println :hello)}}])
;; corrected: used d/function to construct function
(transact conn [{:db/id (d/tempid :db.part/user)
:db/ident :hello
:db/fn (d/function {:lang "clojure"
:params []
:code '(println :hello)})}])
(d/invoke (db conn) :hello)
Source: https://github.com/Datomic/day-of-datomic/blob/master/samples/literals_vs_code.clj
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