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POIn Datomic, how do I get a timeline view of the changes made to the values of a particular entity?
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  1. POIn Datomic, how do I get a timeline view of the changes made to the values of a particular entity?
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    copied!<p>I'm following the tutorial, <a href="http://www.datomic.com/company/resources/tutorial">http://www.datomic.com/company/resources/tutorial</a> but I think I am missing a simple piece of the puzzle of how to access Datomic's time model.</p> <p>If I do a series of adds and retracts</p> <pre><code>;; DO a series of transactions ;; (transact conn [:db/add entity-id attribute value0]) (use 'datomic.api) (dir datomic.api) (def conn (connect "datomic:dev://localhost:4334/demo")) (transact conn '[:db/add 2000 :db/doc "Hello There"]) (q '[:find ?e ?n :where [?e :db/doc ?n] [(= 2000 ?e)]] (db conn)) ; =&gt; &lt;HashSet [[2000 "Hello There"]]&gt; (transact conn '[:db/add 2000 :db/doc "Hello There 1"]) (q '[:find ?e ?n :where [?e :db/doc ?n] [(= 2000 ?e)]] (db conn)) ; =&gt; &lt;HashSet [[2000 "Hello There 1"]]&gt; (transact conn '[:db/add 2000 :db/doc "Hello There 2"]) (q '[:find ?e ?n :where [?e :db/doc ?n] [(= 2000 ?e)]] (db conn)) ; =&gt; &lt;HashSet [[2000 "Hello There 2"]]&gt; (transact conn '[:db/add 2000 :db/doc "Hello There 3"]) (q '[:find ?e ?n :where [?e :db/doc ?n] [(= 2000 ?e)]] (db conn)) ; =&gt; &lt;HashSet [[2000 "Hello There 3"]]&gt; </code></pre> <p>How is it possible to get a series of changes of the value on (entity 2000 attribute :db/doc)?</p> <p>I want to get something in the format of</p> <pre><code>[ [Transaction Number, Time, Value] .... [Transaction Number, Time, Value]] </code></pre> <p>For example:</p> <pre><code>[ [T1, "2012-March-16-9:30:12", "Hello There"] .... .... .... [T27, "2012-June-14-9:54:38", "Hello There 3"] ] </code></pre> <p>It can't be that difficult, but there are a lot of :db internal parameters that I'm not familiar with.</p>
 

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