I forgot to include the GitHub link: https://github.com/cloojure/tupelo
Tupelo Datomic (and the rest of the Tupelo library) is intended to make it easier & more effortless to use Datomic (and Clojure in general). Enjoy! Alan On Sat, Aug 22, 2015 at 5:18 PM, Alan Thompson <clooj...@gmail.com> wrote: > > Hi, > > An email to the Datomic mailing list piqued my interest, so I have added a > new funtion to the Tupelo Datomic library which allows the user to easily > (& efficiently) retrieve all Entity IDs (EIDs) from a given partition > (specified as a keyword). > > For example, suppose in our James Bond Unit Test > <https://github.com/cloojure/tupelo/blob/master/test/tst/tupelo/datomic_bond.clj> > we > wish to add Honey Rider to the partition :people. Then we could use code > like this: > > ns tst.tupelo.datomic-bond > (:require [tupelo.datomic :as td] ... > > ; Create a partition named :people (we could namespace it like > :db.part/people if we wished) > (td/transact *conn* > (td/new-partition :people )) > > ; Create Honey Rider and add her to the :people partition > (let [tx-result @(td/transact *conn* > (td/new-entity :people ; <- partition is first arg > (optional) to td/new-entity > { :person/name "Honey Rider" :location > "Caribbean" :weapon/type #{:weapon/knife} } )) > [honey-eid] (td/eids tx-result) ; retrieve Honey Rider's EID > from the seq (destructuring) > ] > (is (s/validate ts/Eid honey-eid)) ; verify the expected type > (is (= :people ; verify the partition name for > Honey's EID > (td/partition-name (live-db) honey-eid))) > > Suppose we wanted a listing of all EIDs in the :people partition. The > simple way is to use the new function partition-eids as follows: > > ; Show that only Honey is in the people partition > (let [people-eids (td/partition-eids (live-db) :people) > people-entity-maps (map #(td/entity-map (live-db) %) > people-eids) ] > (is (= people-entity-maps [ > {:person/name "Honey Rider", :weapon/type #{:weapon/knife}, > :location "Caribbean"} ] ))) > > So Honey is, indeed, the only person in the newly created :people partition, > and we have used the handy function entity-map to convert her EID into a > normal Clojure map for further processing. > > Enjoy! > Alan > > > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
