So, I am studying a piece of code from the web. I've dissected most of it
and am in the process of re-factoring it.
What I don't understand is why one version works and the other doesn't.
So for both:
(ns gcse-results.core (:use [datomic.api :only [q db] :as d]) (:use
quil.core))
This doesn't work:
(defn make-column-schema [db-ident db-type]
{:db/id #db/id[:db.part/db]
:db/ident db-ident
:db/valueType db-type
:db/cardinality :db.cardinality/one
:db.install/_attribute :db.part/db})
Each call to:
(make-column-schema :results/subject :db.type/string)
The value of #db/id[:db.part/db] is the same.
And this works:
(defn make-column-schema [db-id db-ident db-type]
{:db/id db-id
:db/ident db-ident
:db/valueType db-type
:db/cardinality :db.cardinality/one
:db.install/_attribute :db.part/db})
Each call to: (make-column-schema #db/id[:db.part/db] :results/subject
:db.type/string)
The value of #db/id[:db.part/db] is the different, as expected.
Now I thought that I understood #db/id[:db.part/db] (call to a Java
constructor) but obviously my understanding is flawed as I would expect
both of these functions to produce the same thing, but they don't so
there's obviously some gap in my understanding.
Help?
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