Circe: could not find Lazy implicit value of type io.circe.generic.decoding.DerivedDecoder[A] implicit val comDecoder: Decoder[SolrDoc] = deriveDecoder

[hendisantika]

Here's my case
I have some json from finagle http get client :

package com.hendisantika.circe

import cats.syntax.either._
import io.circe.{Decoder, Json}
import io.circe.optics.JsonPath._
import io.circe.parser._
import io.circe.generic.semiauto._

object TryCirce extends App {


  val json: String = """
    {
      "responseHeader":{
        "status":0,
        "QTime":1,
        "params":{
        "indent":"true",
        "q":"content_t:circe &&\narticle_id_l:6729941",
        "wt":"json"}},
      "response":{"numFound":1,"start":0,"docs":[
      {
        "id":"comment:9404033",
        "comment_id_l":9404033,
        "article_id_l":6729941,
        "reply_to_id_l":0,
        "user_id_l":1686628,
        "username_s":"uzumaki_naruto",
        "email_s":"[email protected]",
        "content_t":"Hello circe! I am learning about you now ",
        "report_i":0,
        "type_s":"comment",
        "category_is":[71],
        "category_ss":["JSON"],
        "created_dt":"2016-05-19T02:12:01Z",
        "created_ts_l":1463623921,
        "is_deleted_i":0,
        "country_code_s":"id",
        "_version_":1534721405555310592},
        {
        "id":"comment:14995036",
        "comment_id_l":14995036,
        "article_id_l":10169921,
        "reply_to_id_l":0,
        "user_id_l":1148579,
        "username_s":"uchiha_madara",
        "email_s":"[email protected]",
        "content_t":"Hai circe, You are very handsome.",
        "report_i":0,
        "type_s":"comment",
        "category_is":[71],
        "category_ss":["LIB"],
        "created_dt":"2017-01-10T01:28:51Z",
        "created_ts_l":1484011731,
        "is_deleted_i":0,
        "country_code_s":"id",
        "_version_":1556099467469389824}]
      }}"""


  implicit val comDecoder: Decoder[SolrDoc] = deriveDecoder[SolrDoc]


  val obj = decode[SolrDoc](json2) match {
    case Left(failure) => println("Oh no --> " + failure)
    case Right(com) => println("OK Success")
      println(com)
  }

}

case class SolrDoc(response: Option[SolrResponse])

case class SolrResponse(
                       numFound:Int,
                       start : Int,
                       docs : List[Article]
                       )

case class Article(
                        id: String,
                        comment_id_l: Option[Long],
                        article_id_l: Option[Long],
                        reply_to_id_l: Option[Long],
                        user_id_l: Option[Long],
                        username_s: Option[String],
                        email_s: Option[String],
                        content_t: String,
                        report_i: Option[Int],
                        type_s: Option[String],
                        category_is: List[Int],
                        category_ss: List[String],
                        created_dt: Option[String],
                        created_ts_l: Option[Long],
                        is_deleted_i: Option[Int],
                        country_code_s: Option[String],
                        version: Option[Long]
                      )

//Error:(43, 47) could not find Lazy implicit value of type io.circe.generic.decoding.DerivedDecoder[A]
  implicit val comDecoder: Decoder[SolrDoc] = deriveDecoder

// Error:(43, 47) not enough arguments for method deriveDecoder: (implicit decode: shapeless.Lazy[io.circe.generic.decoding.DerivedDecoder[A]])io.circe.Decoder[A].
Unspecified value parameter decode.
  implicit val comDecoder: Decoder[SolrDoc] = deriveDecoder

could not find Lazy implicit value of type io.circe.generic.decoding.DerivedDecoder[A] implicit val comDecoder: Decoder[SolrDoc] = deriveDecoder
```
I want to decode the JSON Object to scala case class object
Do you have any solution?
I read the issue about circe from google too.
How I solve the issue. Thanks

[hendisantika]

Is it related to this disclaimer?

[0x5d]

@hendisantika any news on this? I am getting the same error as well.

[hendisantika]

Hi @castillobgr , I have not the updated news yet.

[punkratz312]

case class SolrDoc(response: SolrResponse)

case class SolrResponse(docs: Seq[Article])

case class Article()

object TryCirce extends App {


  import io.circe.generic.semiauto.deriveDecoder

  implicit val comDecoder: Decoder[SolrDoc] = deriveDecoder[SolrDoc]


}

 could not find Lazy implicit value of type io.circe.generic.decoding.DerivedDecoder[models.foo.SolrDoc]
[error]   implicit val comDecoder: Decoder[SolrDoc] = deriveDecoder[SolrDoc]

[travisbrown]

Semi-automatic derivation won't automatically derive decoders for nested case classes. The following should work just fine:

case class SolrDoc(response: SolrResponse)
case class SolrResponse(docs: Seq[Article])
case class Article()

object TryCirce extends App {
  import io.circe.Decoder
  import io.circe.generic.semiauto.deriveDecoder

  implicit val decodeArticle: Decoder[Article] = deriveDecoder[Article]
  implicit val decodeSolrResponse: Decoder[SolrResponse] = deriveDecoder[SolrResponse]
  implicit val decodeSolrDoc: Decoder[SolrDoc] = deriveDecoder[SolrDoc]
}

It also works with the real Article. Please reopen if this doesn't fix your issue.

[punkratz312]

@travisbrown I´ve moved my comment to https://github.com/circe/circe/issues/386. This seems to me the the better place