CODEWITHSUNDEEP
scalasbtimplicit
javier_orta
javier_orta

Reputation: 477

could not find implicit value when i compile the sbt

i have a sbt project that is configured with Dependencias.scala, build.sbt,plugins.sbt, and i have this dependecy : https://christopherdavenport.github.io/cormorant/

 lazy val `cormorant-core`         = "io.chrisdavenport"       %% "cormorant-core"           % Version.cormorant
  lazy val `cormorant-generic`      = "io.chrisdavenport"       %% "cormorant-generic"        % Version.cormorant
  lazy val `cormorant-parser`       = "io.chrisdavenport"       %% "cormorant-parser"         % Version.cormorant
  lazy val `cormorant-http4s`       = "io.chrisdavenport"       %% "cormorant-http4s"         % Version.cormorant
  lazy val `cormorant-refined`      = "io.chrisdavenport"       %% "cormorant-refined"        % Version.cormorant

and when i compile it: sbt compile, it appears this error:

[error] /home/javier/IdeaProjects/ERPFetcherJavs/src/main/scala/com/arkondata/bipo/utils/CSVHandler.scala:11:53: could not find implicit value for parameter gen: shapeless.LabelledGeneric.Aux[A,H]
[error]   private implicit val lr: LabelledRead[ItemData] = deriveLabelledRead
[error]                                                     ^
[error] /home/javier/IdeaProjects/ERPFetcherJavs/src/main/scala/com/arkondata/bipo/utils/CSVHandler.scala:13:54: could not find implicit value for parameter gen: shapeless.LabelledGeneric.Aux[A,H]
[error]   private implicit val lw: LabelledWrite[ItemData] = deriveLabelledWrite
[error]                                                      ^
[error] two errors found
[error] (Compile / compileIncremental) Compilation failed

how can i fix it??

Upvotes: 0

Views: 409

Answers (1)

Tomer Shetah
Tomer Shetah

Reputation: 8529

Let's assume ItemData is a simple case class, for example:

case class ItemData(a: String)

Then, when running the code above, the error above reproduces. Why is that happening?

deriveLabelledRead is a method at package io.chrisdavenport.cormorant.generic, which takes 2 implicits:

def deriveLabelledRead[A, H <: HList](
  implicit gen: LabelledGeneric.Aux[A, H],
  hlw: Lazy[LabelledRead[H]])

After reading the docs, we need to do bunch of imports:

import io.chrisdavenport.cormorant._
import io.chrisdavenport.cormorant.generic.semiauto._
import io.chrisdavenport.cormorant.parser._
import io.chrisdavenport.cormorant.implicits._
import cats.implicits._
import java.util.UUID
import java.time.Instant

When importing those, deriveLabelledRead has the implicits it needs to be created correctly.

Upvotes: 3

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