fix: scala 3 default value from fields

zio-schema-derivation/shared/src/main/scala-3/zio/schema/DeriveSchema.scala

@@ -278,7 +278,8 @@ private case class DeriveSchema()(using val ctx: Quotes) {
  }
 
  private def defaultValues(from: Symbol): Predef.Map[String, Expr[Any]] =
- (1 to from.primaryConstructor.paramSymss.size).toList.map(
+ val params = from.primaryConstructor.paramSymss.flatten.filter(!_.isTypeParam)
+ val result = (1 to params.size).toList.map(
  i =>
  from
  .companionClass
@@ -295,7 +296,8 @@ private case class DeriveSchema()(using val ctx: Quotes) {
  if (select.isExpr) select.asExpr
  else select.appliedToType(TypeRepr.of[Any]).asExpr
  }
- ).zip(from.primaryConstructor.paramSymss.flatten.filter(!_.isTypeParam).map(_.name)).collect{ case (Some(expr), name) => name -> expr }.toMap
+ ).zip(params.map(_.name))
+ result.collect{ case (Some(expr), name) => name -> expr }.toMap
 
  private def fromConstructor(from: Symbol): scala.collection.Map[String, List[Expr[Any]]] = {
  val defaults = defaultValues(from)

zio-schema-json/shared/src/test/scala-3/zio/schema/codec/DefaultValueSpec.scala

@@ -0,0 +1,33 @@
+package zio.schema.codec
+
+import zio.Console._
+import zio._
+import zio.json.{ DeriveJsonEncoder, JsonEncoder }
+import zio.schema._
+import zio.test.Assertion._
+import zio.test.TestAspect._
+import zio.test.*
+
+object DefaultValueSpec extends ZIOSpecDefault {
+
+ def spec: Spec[TestEnvironment, Any] =
+ suite("Custom Spec")(
+ customSuite,
+ ) @@ timeout(90.seconds)
+
+ private val customSuite = suite("custom")(
+ suite("default value schema")(
+ test("default value at last field") {
+ val result = JsonCodec.jsonDecoder(Schema[WithDefaultValue]).decodeJson("""{"orderId": 1}""")
+ assertTrue(result.isRight)
+ }
+ )
+ )
+
+ case class WithDefaultValue(orderId:Int, description: String = "desc")
+
+ object WithDefaultValue {
+ implicit lazy val schema: Schema[WithDefaultValue] = DeriveSchema.gen[WithDefaultValue]
+ }
+
+}