
com.websudos.phantom.example.basics.CompositeKeyRecipes.scala Maven / Gradle / Ivy
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package com.websudos.phantom.example.basics
import java.util.UUID
import scala.concurrent.{ Future => ScalaFuture }
import com.datastax.driver.core.Row
import com.websudos.phantom.dsl._
/**
* In this example we will create a table storing recipes.
* This time we will use a composite key formed by name and id.
*/
// You can seal the class and only allow importing the companion object.
// The companion object is where you would implement your custom methods.
// Keep reading for examples.
sealed class CompositeKeyRecipes extends CassandraTable[ConcreteCompositeKeyRecipes, Recipe] {
// First the partition key, which is also a Primary key in Cassandra.
object id extends UUIDColumn(this) with PartitionKey[UUID] {
// You can override the name of your key to whatever you like.
// The default will be the name used for the object, in this case "id".
override lazy val name = "the_primary_key"
}
// Now we define a column for each field in our case class.
// If we want to add another key to our composite, simply mixin PrimaryKey[ValueType]
object name extends StringColumn(this) with PrimaryKey[String] // and you're done
object title extends StringColumn(this)
object author extends StringColumn(this)
object description extends StringColumn(this)
// Custom data types can be stored easily.
// Cassandra collections target a small number of items, but usage is trivial.
object ingredients extends SetColumn[String](this)
object props extends MapColumn[String, String](this)
object timestamp extends DateTimeColumn(this)
// Now the mapping function, transforming a row into a custom type.
// This is a bit of boilerplate, but it's one time only and very short.
def fromRow(row: Row): Recipe = {
Recipe(
id(row),
name(row),
title(row),
author(row),
description(row),
ingredients(row),
props(row),
timestamp(row)
)
}
}
abstract class ConcreteCompositeKeyRecipes extends CompositeKeyRecipes with RootConnector {
// now you can use composite keys in the normal way.
// If you would select only by id,
// Cassandra will tell you a part of the primary is missing from the where clause.
// Querying by composite keys is trivial using the "and" operator.
def getRecipeByIdAndName(id: UUID, name: String): ScalaFuture[Option[Recipe]] = {
select.where(_.id eqs id).and(_.name eqs name).one()
}
}
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