Minimal project setup to test using Molecule with a starter/pro Datomic Peer in-memory database (protocol: mem).
import sbt.Keys._
lazy val `molecule-basic` = project.in(file("."))
.enablePlugins(MoleculePlugin)
.settings(
name := "molecule-datomic-peer-pro-mem",
scalaVersion := "2.13.8",
resolvers ++= Seq(
Resolver.sonatypeRepo("releases"),
"clojars" at "https://clojars.org/repo",
"my.datomic.com" at "https://my.datomic.com/repo"
),
/*
Downloading Datomic Starter/Pro requires authentication of your license:
Create a ~/.sbt/.credentials file with the following content:
realm=Datomic Maven Repo
host=my.datomic.com
id=my.datomic.com
user=<your-username>
pass=<your-password>
Then let sbt provide your secret credentials:
*/
credentials += Credentials(Path.userHome / ".sbt" / ".credentials"),
libraryDependencies ++= Seq(
"org.scalamolecule" %% "molecule" % "1.1.0",
"com.datomic" % "datomic-pro" % "1.0.6344"
),
// Important to exclude fee version when using pro to avoid clashes with pro version
excludeDependencies += ExclusionRule("com.datomic", "datomic-free"),
// path to domain model directory
moleculeDataModelPaths := Seq("app"),
// Generate Molecule boilerplate code with `sbt clean compile -Dmolecule=true`
moleculePluginActive := sys.props.get("molecule") == Some("true"),
// Let IDE detect created jars in unmanaged lib directory
exportJars := true
)
Connect, recreate in-memory database and get database connection
implicit val conn = Datomic_Peer.recreateDbFrom(SampleSchema)
Since we are not persisting the database, we let Molecule create a random database name. We don’t need to supply the default “mem” protocol either. So this is really simple.
If you need persisting data, please see other storage options or have a look at one of the other sample projects.
Having an implicit connection in scope, we can start transacting and querying sampleDb
with molecules:
// Transact
Person.name("John").age(24).save
// Query
Person.name.age.get.map(_.head ==> ("John", 24))
Add/change definitions in the SampleDataModel and run sbt clean compile -Dmolecule=true
in your project root to have Molecule re-generate boilerplate code. Then you can try out using your new attributes in new molecules in App
.