danielasfregola / random-data-generator-magnolia Goto Github PK

When I alter the README example to use an additional java.time.Instant field, like this:

import java.time.Instant

import com.danielasfregola.randomdatagenerator.magnolia.RandomDataGenerator

object MyApp extends App with RandomDataGenerator {

  case class Example(text: String, n: Int, inst: Instant)

  val example: Example = random[Example]
}

Then I get the following error messages:

• Error: could not find implicit value for evidence parameter of type org.scalacheck.Arbitrary[Example]
• Error: not enough arguments for method random: (implicit evidence$1: reflect.runtime.universe.WeakTypeTag[Example], implicit evidence$2: org.scalacheck.Arbitrary[Example])Example.

This is misleading because an Arbitrary[Example] can be created but not an Arbitrary[Instant]. If I add an implicit Arbitrary[Instant] in scope, it compiles just fine and yields the expected result.

Can this be improved?

I have been using the previous version of random-data-generator, which is based on shapeless, for quite sometime and is awesome. Recently, I tried using this for generating a Billion records. Since the random method is doing an eager evaluation, this is causing me an OOM error. Could you please guide me in this regard, as this would be my on going task to generate billions of records.
Thank you.
Note: Ideally, this is not an issue but calling out for help :)

We would upgrade to the latest version of magnolia

Upgrade to Magnolia 0.7

Test coverage seems to be broken since the upgrade to scala 2.13 and sbt 1.3.2.
We should fix it sooner rather than later (see #15's builds)

Duplicate of DanielaSfregola/random-data-generator#50

We just need to replicate the following PRs in random-data-generator-magnolia:

• DanielaSfregola/random-data-generator#55
• DanielaSfregola/random-data-generator#56

....why am I not able to make it work?

Asked for advice in etaty/scalacheck-magnolia#1

upgrade to magnolia 7.1