Add the skip attribute to the InputObject fields.

derive/src/args.rs

@@ -238,6 +238,8 @@ pub struct InputObjectField {
     #[darling(default)]
     pub flatten: bool,
     #[darling(default)]
+    pub skip: bool,
+    #[darling(default)]
     pub visible: Option<Visible>,
 }
 

derive/src/input_object.rs

@@ -61,6 +61,14 @@ pub fn generate(object_args: &args::InputObject) -> GeneratorResult<TokenStream>
                 .rename(ident.unraw().to_string(), RenameTarget::Field)
         });
 
+        if field.skip {
+            get_fields.push(quote! {
+                let #ident: #ty = ::std::default::Default::default();
+            });
+            fields.push(ident);
+            continue;
+        }
+
         if field.flatten {
             flatten_fields.push((ident, ty));
 

src/lib.rs

@@ -495,8 +495,9 @@ pub use async_graphql_derive::Enum;
 /// | default_with | Expression to generate default value     | code string | Y        |
 /// | validator    | Input value validator                    | [`InputValueValidator`](validators/trait.InputValueValidator.html) | Y        |
 /// | flatten      | Similar to serde (flatten)               | boolean     | Y        |
-/// | visible       | If `false`, it will not be displayed in introspection. *[See also the Book](https://async-graphql.github.io/async-graphql/en/visibility.html).* | bool | Y |
-/// | visible       | Call the specified function. If the return value is `false`, it will not be displayed in introspection. | string | Y |
+/// | skip         | Skip this field, use `Default::default` to get a default value for this field. | bool     | Y        |
+/// | visible      | If `false`, it will not be displayed in introspection. *[See also the Book](https://async-graphql.github.io/async-graphql/en/visibility.html).* | bool | Y |
+/// | visible      | Call the specified function. If the return value is `false`, it will not be displayed in introspection. | string | Y |
 ///
 /// # Examples
 ///

tests/input_object.rs

@@ -287,3 +287,34 @@ pub async fn test_inputobject_flatten_multiple() {
         })
     );
 }
+
+#[async_std::test]
+pub async fn test_input_object_skip_field() {
+    #[derive(InputObject)]
+    struct MyInput2 {
+        a: i32,
+        #[graphql(skip)]
+        b: i32,
+    }
+
+    struct Root;
+
+    #[Object]
+    impl Root {
+        async fn a(&self, input: MyInput2) -> i32 {
+            assert_eq!(input.b, i32::default());
+            input.a
+        }
+    }
+
+    let schema = Schema::new(Root, EmptyMutation, EmptySubscription);
+    let query = r#"{
+            a(input:{a: 777})
+        }"#;
+    assert_eq!(
+        schema.execute(query).await.into_result().unwrap().data,
+        value!({
+            "a": 777
+        })
+    );
+}