Backport accepting explicit null argument for nullable list input parameter (#1086, #1085)

Author: tyranron

juniper/CHANGELOG.md

@@ -1,6 +1,6 @@
 # master
 
-- No changes yet
+- Fix incorrect error when explicit `null` provided for `null`able list input parameter. ([#1086](https://github.com/graphql-rust/juniper/pull/1086))
 
 # [[0.15.9] 2022-02-02](https://github.com/graphql-rust/juniper/releases/tag/juniper-v0.15.9)
 

juniper/src/types/utilities.rs

@@ -25,6 +25,7 @@ where
             }
         }
         TypeType::List(ref inner) => match *arg_value {
+            InputValue::Null | InputValue::Variable(_) => true,
             InputValue::List(ref items) => items
                 .iter()
                 .all(|i| is_valid_literal_value(schema, inner, &i.item)),

juniper/src/validation/rules/arguments_of_correct_type.rs

@@ -85,7 +85,7 @@ mod tests {
     };
 
     #[test]
-    fn good_null_value() {
+    fn null_into_nullable_int() {
         expect_passes_rule::<_, _, DefaultScalarValue>(
             factory,
             r#"
@@ -98,6 +98,20 @@ mod tests {
         );
     }
 
+    #[test]
+    fn null_into_nullable_list() {
+        expect_passes_rule::<_, _, DefaultScalarValue>(
+            factory,
+            r#"
+            {
+              complicatedArgs {
+                stringListArgField(stringListArg: null)
+              }
+            }
+        "#,
+        );
+    }
+
     #[test]
     fn null_into_int() {
         expect_fails_rule::<_, _, DefaultScalarValue>(
@@ -116,6 +130,24 @@ mod tests {
         );
     }
 
+    #[test]
+    fn null_into_list() {
+        expect_fails_rule::<_, _, DefaultScalarValue>(
+            factory,
+            r#"
+            {
+              complicatedArgs {
+                nonNullStringListArgField(nonNullStringListArg: null)
+              }
+            }
+        "#,
+            &[RuleError::new(
+                &error_message("nonNullStringListArg", "[String!]!"),
+                &[SourcePosition::new(111, 3, 64)],
+            )],
+        );
+    }
+
     #[test]
     fn good_int_value() {
         expect_passes_rule::<_, _, DefaultScalarValue>(

juniper/src/validation/test_harness.rs

@@ -666,6 +666,9 @@ where
             registry
                 .field::<Option<String>>("stringListArgField", i)
                 .argument(registry.arg::<Option<Vec<Option<String>>>>("stringListArg", i)),
+            registry
+                .field::<Option<String>>("nonNullStringListArgField", i)
+                .argument(registry.arg::<Vec<String>>("nonNullStringListArg", i)),
             registry
                 .field::<Option<String>>("complexArgField", i)
                 .argument(registry.arg::<Option<ComplexInput>>("complexArg", i)),