datahike migrations

Manage datahike schema with ragtime.

(Based on a fork of ragtime.datomic (https://github.com/hden/ragtime.datomic).)

Usage

First, add the following dependency to your project:

[replikativ/datahike-migrations "0.1.0-SNAPSHOT"]

Once you have at least one migration, you can set up Ragtime. You'll need to build a configuration map that will tell Ragtime how to connect to your database, and where the migrations are. In the example below, we'll put the configuration in the user namespace:

(ns ragtime.sandbox
  (:require [ragtime.datomic :as rd]
            [ragtime.repl :as repl]
            [datahike.api :as d]))



    (def cfg {:store  {:backend :mem :id "sandbox"}
              :keep-history? true
              :schema-flexibility :read})

    (d/delete-database cfg)

    (def db (d/create-database cfg))

    (def conn (d/connect cfg))

    (def migration-1 (rd/create-migration :id [{:db/ident       :inv/sku
                                              :db/valueType   :db.type/string
                                                :db/unique      :db.unique/identity
                                                :db/cardinality :db.cardinality/one}]))

    (def migration-2 (rd/create-migration :id-2 [{:db/ident       :inv/sku-2
                                                :db/valueType   :db.type/string
                                                :db/unique      :db.unique/identity
                                                :db/cardinality :db.cardinality/one}]))
    ;; At time 1
    ;;
    (def config
          {:datastore  (rd/create-connection conn)
           :migrations [migration-1 migration-2]})
           
  ;; At time 2
  ;;
  (def migration-3 (rd/create-migration :id-3 [{:db/ident       :inv/sku-3
                                                :db/valueType   :db.type/string
                                                :db/unique      :db.unique/identity
                                                :db/cardinality :db.cardinality/one}]))
  (def config
    {:datastore  (rd/create-connection conn)
     :migrations [migration-1 migration-2 migration-3]})

  (repl/migrate config)

  (d/datoms @conn {:index :eavt})

This library will install an extra schema inn your database.

{:db/ident       :ragtime.datomic/migration-id
 :db/valueType   :db.type/keyword
 :db/unique      :db.unique/identity
 :db/cardinality :db.cardinality/one}

The following datum will be appended to each of the schema transactions.

[:db/add "datomic.tx" :ragtime.datomic/migration-id migration-id]

License

This program and the accompanying materials are made available under the terms of the Eclipse Public License 2.0 which is available at http://www.eclipse.org/legal/epl-2.0.

grischoun/ragtime.datomic

datahike migrations

Usage

License