Merge pull request #250 from gemini-hlsw/not-a-leaf

improve error message
typelevel · Aug 11, 2022 · b8c5ed2 · b8c5ed2
2 parents 4a5db39 + a95c76c
commit b8c5ed2
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/modules/sql/src/main/scala/SqlMapping.scala b/modules/sql/src/main/scala/SqlMapping.scala
@@ -3061,7 +3061,9 @@ trait SqlMapping[F[_]] extends CirceMapping[F] with SqlModule[F] { self =>
  def isLeaf: Boolean = tpe.isLeaf
 
  def asLeaf: Result[Json] =
- mapped.encoderForLeaf(tpe).map(enc => enc(focus).rightIor).getOrElse(mkErrorResult(s"Not a leaf: $focus"))
+ mapped.encoderForLeaf(tpe).map(enc => enc(focus).rightIor).getOrElse(mkErrorResult(
+ s"Cannot encode value $focus at ${context.path.reverse.mkString("/")} (of GraphQL type ${context.tpe}). Did you forget a LeafMapping?".stripMargin.trim
+ ))
 
  def isList: Boolean =
  tpe match {