Support Boolean fields in conditional hydration

lib/src/main/java/graphql/nadel/engine/blueprint/hydration/NadelHydrationCondition.kt

@@ -34,6 +34,15 @@ sealed class NadelHydrationCondition {
         }
     }
 
+    data class BooleanResultEquals(
+        override val fieldPath: NadelQueryPath,
+        val value: Boolean,
+    ) : NadelHydrationCondition() {
+        override fun evaluate(fieldValue: Any?): Boolean {
+            return fieldValue is Boolean && fieldValue == value
+        }
+    }
+
     data class StringResultMatches(
         override val fieldPath: NadelQueryPath,
         val regex: Regex,

lib/src/main/java/graphql/nadel/validation/NadelSchemaHydrationValidationError.kt

@@ -553,13 +553,14 @@ data class NadelHydrationResultConditionUnsupportedFieldTypeError(
         val str = Scalars.GraphQLString.name
         val int = Scalars.GraphQLInt.name
         val id = Scalars.GraphQLID.name
+        val boolean = Scalars.GraphQLBoolean.name
         val parentTypeName = parentType.overall.name
 
         getHydrationErrorMessage(
             parentType,
             virtualField,
             hydration,
-            reason = "condition field $parentTypeName.$conditionField must be of type $str, $int, $id or enum but is $conditionFieldType",
+            reason = "condition field $parentTypeName.$conditionField must be of type $str, $int, $id, $boolean or enum but is $conditionFieldType",
         )
     }
 

lib/src/main/java/graphql/nadel/validation/hydration/NadelHydrationConditionValidation.kt

@@ -1,5 +1,6 @@
 package graphql.nadel.validation.hydration
 
+import graphql.Scalars.GraphQLBoolean
 import graphql.Scalars.GraphQLID
 import graphql.Scalars.GraphQLInt
 import graphql.Scalars.GraphQLString
@@ -57,6 +58,10 @@ private sealed class NadelConditionFieldType {
         override val graphQLType = GraphQLID
     }
 
+    object BooleanType : NadelConditionFieldType() {
+        override val graphQLType = GraphQLBoolean
+    }
+
     data class EnumType(
         val enumType: GraphQLEnumType,
     ) : NadelConditionFieldType() {
@@ -134,6 +139,7 @@ internal class NadelHydrationConditionValidation {
             GraphQLString -> NadelConditionFieldType.StringType
             GraphQLInt -> NadelConditionFieldType.IntType
             GraphQLID -> NadelConditionFieldType.IdType
+            GraphQLBoolean -> NadelConditionFieldType.BooleanType
             is GraphQLEnumType -> NadelConditionFieldType.EnumType(conditionFieldOutputType)
             else -> null
         } ?: return NadelHydrationResultConditionUnsupportedFieldTypeError(
@@ -304,6 +310,11 @@ internal class NadelHydrationConditionValidation {
                 fieldPath = NadelQueryPath(resultCondition.pathToSourceField),
                 value = expectedValue.toLong(),
             ).asInterimSuccess()
+        } else if (expectedValue is Boolean && conditionFieldType == NadelConditionFieldType.BooleanType) {
+            return NadelHydrationCondition.BooleanResultEquals(
+                fieldPath = NadelQueryPath(resultCondition.pathToSourceField),
+                value = expectedValue,
+            ).asInterimSuccess()
         } else {
             return NadelHydrationConditionIncompatibleValueError(
                 parentType = parent,