Fix "variable is not used" error

.gitea/workflows/build.yml

@@ -0,0 +1,68 @@
+name: Build
+
+on:
+  push:
+  pull_request:
+    branches: [master]
+
+jobs:
+  audit:
+    runs-on: alpine
+    steps:
+      - name: Set up environment
+        shell: ash {0}
+        run: |
+          apk add --no-cache git bash curl build-base readline-dev openssl-dev zlib-dev libpq-dev gmp-dev
+      - name: Prepare system
+        run: |
+          curl --create-dirs --output-dir \
+            ~/.ghcup/bin https://downloads.haskell.org/~ghcup/0.1.19.5/x86_64-linux-ghcup-0.1.19.5 -o ghcup
+          chmod +x ~/.ghcup/bin/ghcup
+          ~/.ghcup/bin/ghcup install ghc 9.4.8
+          ~/.ghcup/bin/ghcup install cabal 3.6.2.0
+      - uses: actions/checkout@v4
+      - name: Install dependencies
+        run: |
+          ~/.ghcup/bin/ghcup run --ghc 9.4.8 --cabal 3.6.2.0 -- cabal update
+          ~/.ghcup/bin/ghcup run --ghc 9.4.8 --cabal 3.6.2.0 -- cabal install hlint --constraint="hlint ==3.6.1"
+      - run: ~/.cabal/bin/hlint -- src tests
+
+  test:
+    runs-on: alpine
+    steps:
+      - name: Set up environment
+        shell: ash {0}
+        run: |
+          apk add --no-cache git bash curl build-base readline-dev openssl-dev zlib-dev libpq-dev gmp-dev
+      - name: Prepare system
+        run: |
+          curl --create-dirs --output-dir \
+            ~/.ghcup/bin https://downloads.haskell.org/~ghcup/0.1.19.5/x86_64-linux-ghcup-0.1.19.5 -o ghcup
+          chmod +x ~/.ghcup/bin/ghcup
+          ~/.ghcup/bin/ghcup install ghc 9.4.8
+          ~/.ghcup/bin/ghcup install cabal 3.6.2.0
+      - uses: actions/checkout@v4
+      - name: Install dependencies
+        run: |
+          ~/.ghcup/bin/ghcup run --ghc 9.4.8 --cabal 3.6.2.0 -- cabal update
+          ~/.ghcup/bin/ghcup run --ghc 9.4.8 --cabal 3.6.2.0 -- cabal build graphql-test
+      - run: ~/.ghcup/bin/ghcup run --ghc 9.4.8 --cabal 3.6.2.0 -- cabal test --test-show-details=direct
+
+  doc:
+    runs-on: alpine
+    steps:
+      - name: Set up environment
+        shell: ash {0}
+        run: |
+          apk add --no-cache git bash curl build-base readline-dev openssl-dev zlib-dev libpq-dev gmp-dev
+      - name: Prepare system
+        run: |
+          curl --create-dirs --output-dir \
+            ~/.ghcup/bin https://downloads.haskell.org/~ghcup/0.1.19.5/x86_64-linux-ghcup-0.1.19.5 -o ghcup
+          chmod +x ~/.ghcup/bin/ghcup
+          ~/.ghcup/bin/ghcup install ghc 9.4.8
+          ~/.ghcup/bin/ghcup install cabal 3.6.2.0
+      - uses: actions/checkout@v4
+      - name: Install dependencies
+        run: ~/.ghcup/bin/ghcup run --ghc 9.4.8 --cabal 3.6.2.0 -- cabal update
+      - run: ~/.ghcup/bin/ghcup run --ghc 9.4.8 --cabal 3.6.2.0 -- cabal haddock --enable-documentation

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to
 ### Fixed
 - `gql` removes not only leading `\n` but also `\r`.
 - Fix non nullable type string representation in executor error messages.
+- Fix input objects not being coerced to lists.
 
 ## [1.2.0.1] - 2023-04-25
 ### Fixed

graphql.cabal

@@ -21,7 +21,7 @@ extra-source-files:
   CHANGELOG.md
   README.md
 tested-with:
-  GHC == 9.2.8,
+  GHC == 9.4.7,
   GHC == 9.6.3
 
 source-repository head

src/Language/GraphQL/Validate/Rules.hs

@@ -664,11 +664,26 @@ variableUsageDifference difference errorMessage = OperationDefinitionRule $ \cas
         = filterSelections' selections
         >>= lift . mapReaderT (<> mapDirectives directives') . pure
     findDirectiveVariables (Full.Directive _ arguments _) = mapArguments arguments
-    mapArguments = Seq.fromList . mapMaybe findArgumentVariables
+
+    mapArguments = Seq.fromList . (>>= findArgumentVariables)
     mapDirectives = foldMap findDirectiveVariables
-    findArgumentVariables (Full.Argument _ Full.Node{ node = Full.Variable value', ..} _) =
+
-        Just (value', [location])
+    findArgumentVariables (Full.Argument _ Full.Node{node = value, ..} _) =
-    findArgumentVariables _ = Nothing
+        findValueVariables location value
+
+    findValueVariables location (Full.Variable value') = [(value', [location])]
+    findValueVariables location (Full.List values) =
+        values
+            >>= (\(Full.Node{node = value}) -> findValueVariables location value)
+    findValueVariables _ (Full.Object fields) =
+        fields
+            >>= ( \( Full.ObjectField
+                        { location = location
+                        , value = Full.Node{node = value}
+                        }
+                    ) -> findValueVariables location value
+                )
+    findValueVariables _ _ = []
     makeError operationName (variableName, locations') = Error
         { message = errorMessage operationName variableName
         , locations = locations'

tests/Language/GraphQL/ExecuteSpec.hs

@@ -69,6 +69,7 @@ queryType = Out.ObjectType "Query" Nothing []
     , ("throwing", ValueResolver throwingField throwingResolver)
     , ("count", ValueResolver countField countResolver)
     , ("sequence", ValueResolver sequenceField sequenceResolver)
+    , ("withInputObject", ValueResolver withInputObjectField withInputObjectResolver)
     ]
   where
     philosopherField =
@@ -89,6 +90,17 @@ queryType = Out.ObjectType "Query" Nothing []
         let fieldType = Out.ListType $ Out.NonNullScalarType int
          in Out.Field Nothing fieldType HashMap.empty
     sequenceResolver = pure intSequence
+    withInputObjectResolver = pure $ Type.Int 0
+    withInputObjectField =
+        Out.Field Nothing (Out.NonNullScalarType int) $ HashMap.fromList
+            [("values", In.Argument Nothing withInputObjectArgumentType Nothing)]
+    withInputObjectArgumentType = In.NonNullListType
+        $ In.NonNullInputObjectType inputObjectType
+
+inputObjectType :: In.InputObjectType
+inputObjectType = In.InputObjectType "InputObject" Nothing $
+    HashMap.singleton "name" $
+        In.InputField Nothing (In.NonNullScalarType int) Nothing
 
 intSequence :: Value
 intSequence = Type.List [Type.Int 1, Type.Int 2, Type.Int 3]
@@ -328,18 +340,6 @@ spec =
                     sourceQuery = "{ philosopher { majorWork { title } } }"
                  in sourceQuery `shouldResolveTo` expected
 
-            it "gives location information for invalid scalar arguments" $
-                let data'' = Object $ HashMap.singleton "philosopher" Null
-                    executionErrors = pure $ Error
-                        { message =
-                            "Argument \"id\" has invalid type. Expected type ID, found: True."
-                        , locations = [Location 1 15]
-                        , path = [Segment "philosopher"]
-                        }
-                    expected = Response data'' executionErrors
-                    sourceQuery = "{ philosopher(id: true) { lastName } }"
-                 in sourceQuery `shouldResolveTo` expected
-
             it "gives location information for failed result coercion" $
                 let data'' = Object $ HashMap.singleton "philosopher" Null
                     executionErrors = pure $ Error
@@ -389,6 +389,25 @@ spec =
                     sourceQuery = "{ sequence }"
                 in sourceQuery `shouldResolveTo` expected
 
+            context "Arguments" $ do
+                it "gives location information for invalid scalar arguments" $
+                    let data'' = Object $ HashMap.singleton "philosopher" Null
+                        executionErrors = pure $ Error
+                            { message =
+                                "Argument \"id\" has invalid type. Expected type ID, found: True."
+                            , locations = [Location 1 15]
+                            , path = [Segment "philosopher"]
+                            }
+                        expected = Response data'' executionErrors
+                        sourceQuery = "{ philosopher(id: true) { lastName } }"
+                    in sourceQuery `shouldResolveTo` expected
+
+                it "puts an object in a list if needed" $
+                    let data'' = Object $ HashMap.singleton "withInputObject" $ Type.Int 0
+                        expected = Response data'' mempty
+                        sourceQuery = "{ withInputObject(values: { name: 0 }) }"
+                    in sourceQuery `shouldResolveTo` expected
+
             context "queryError" $ do
                 let namedQuery name = "query " <> name <> " { philosopher(id: \"1\") { interest } }"
                     twoQueries = namedQuery "A" <> " " <> namedQuery "B"