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-rw-r--r--src/Language/GraphQL/Execute.hs4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/Language/GraphQL/Execute.hs b/src/Language/GraphQL/Execute.hs
index ff1078c..471cd00 100644
--- a/src/Language/GraphQL/Execute.hs
+++ b/src/Language/GraphQL/Execute.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE OverloadedStrings #-}
+
-- | This module provides functions to execute a @GraphQL@ request.
module Language.GraphQL.Execute
( execute
@@ -42,6 +44,8 @@ executeRequest (Transform.Document types' rootObjectType operation)
executeOperation types' rootObjectType fields
| (Transform.Mutation _ fields) <- operation =
executeOperation types' rootObjectType fields
+ | otherwise =
+ pure $ singleError "This service does not support subscriptions."
-- This is actually executeMutation, but we don't distinguish between queries
-- and mutations yet.