Query and display weather data for all country

src/main/scala/server/ValidateRoutes.scala

@@ -2,6 +2,7 @@ package server
 
 import cats.data.NonEmptyList
 import parse.Aggregate.AggregateKey
+import parse.WeatherData
 
 import java.time.{LocalDate, LocalDateTime}
 import java.time.format.DateTimeFormatter
@@ -56,6 +57,14 @@ object ValidateRoutes {
     }
   }
 
+  object AggFieldList {
+    def unapply(str: String): Option[NonEmptyList[String]] = {
+      val weatherFields = WeatherData.getKeys
+      val filteredList = str.split(",").toList.filter(weatherFields.contains)
+      NonEmptyList.fromList(filteredList)
+    }
+  }
+
   object AggKey {
     def unapply(str: String): Option[AggregateKey] = {
       AggregateKey.fromString(str)