class Migrator[R, V <: Version] extends AnyRef
A Migrator[R, V]
can migrate raw values of type R from older
versions to version V
by applying a specific Migration[R]
to it.
You can create instances of Migrator[R, V]
by using
a small type-safe DSL consisting of two parts: the
from[R, V1]
function will create a
Migrator[R, V1]
and then you can use the
to[V](migration: Migration[R])
function to build
instances that can migrate multiple versions.
- R
The type of raw data being migrated. In the JSON implementation this would be
JsValue
.- V
The "current" version of this Migrator, i.e. it can migrate values from V1 to this version or any version in between.
Using the json implementation:
val p = persister[CartCreated, V3]("cart-created", from[JsValue, V1] .to[V2](_.update('cart / 'items / * / 'price ! set[Int](1000))) .to[V3](_.update('timestamp ! set[Long](System.currentTimeMillis - 3600000L))) )
Example:
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