Add `extends` attribute for derive macros Subscription and MergedSubscription.

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Remove unnecessary Box from WebSocket messages.
 - Export subscription type to Federation SDL. (for [GraphGate](https://github.com/async-graphql/graphgate) 😁)
+- Add `extends` attribute for derive macros Subscription and MergedSubscription.
 
 ## [2.5.11] - 2021-03-07
 

derive/src/args.rs

@@ -427,6 +427,7 @@ pub struct Subscription {
     pub rename_fields: Option<RenameRule>,
     pub rename_args: Option<RenameRule>,
     pub use_type_description: bool,
+    pub extends: bool,
 }
 
 #[derive(FromMeta, Default)]
@@ -497,6 +498,8 @@ pub struct MergedSubscription {
     pub name: Option<String>,
     #[darling(default)]
     pub visible: Option<Visible>,
+    #[darling(default)]
+    pub extends: bool,
 }
 
 #[derive(Debug, Copy, Clone, FromMeta)]

derive/src/merged_subscription.rs

@@ -10,6 +10,7 @@ use crate::utils::{get_crate_name, get_rustdoc, visible_fn, GeneratorResult};
 pub fn generate(object_args: &args::MergedSubscription) -> GeneratorResult<TokenStream> {
     let crate_name = get_crate_name(object_args.internal);
     let ident = &object_args.ident;
+    let extends = object_args.extends;
     let gql_typename = object_args
         .name
         .clone()
@@ -68,7 +69,7 @@ pub fn generate(object_args: &args::MergedSubscription) -> GeneratorResult<Token
                         description: #desc,
                         fields,
                         cache_control: ::std::default::Default::default(),
-                        extends: false,
+                        extends: #extends,
                         keys: ::std::option::Option::None,
                         visible: #visible,
                     }

derive/src/subscription.rs

@@ -20,6 +20,7 @@ pub fn generate(
 ) -> GeneratorResult<TokenStream> {
     let crate_name = get_crate_name(subscription_args.internal);
     let (self_ty, self_name) = get_type_path_and_name(item_impl.self_ty.as_ref())?;
+    let extends = subscription_args.extends;
 
     let gql_typename = subscription_args
         .name
@@ -441,7 +442,7 @@ pub fn generate(
                         fields
                     },
                     cache_control: ::std::default::Default::default(),
-                    extends: false,
+                    extends: #extends,
                     keys: ::std::option::Option::None,
                     visible: ::std::option::Option::None,
                 })

src/lib.rs

@@ -825,6 +825,7 @@ pub use async_graphql_derive::Union;
 /// | name          | Object name               | string   | Y        |
 /// | rename_fields | Rename all the fields according to the given case convention. The possible values are "lowercase", "UPPERCASE", "PascalCase", "camelCase", "snake_case", "SCREAMING_SNAKE_CASE".| string   | Y        |
 /// | rename_args   | Rename all the arguments according to the given case convention. The possible values are "lowercase", "UPPERCASE", "PascalCase", "camelCase", "snake_case", "SCREAMING_SNAKE_CASE".| string   | Y        |
+/// | extends       | Add fields to an entity that's defined in another service | bool | Y |
 /// | use_type_description | Specifies that the description of the type is on the type declaration. [`Description`]()(derive.Description.html) | bool | Y |
 ///
 /// # Field parameters
@@ -945,7 +946,6 @@ pub use async_graphql_derive::NewType;
 /// | name          | Object name               | string   | Y        |
 /// | cache_control | Object cache control      | [`CacheControl`](struct.CacheControl.html) | Y        |
 /// | extends       | Add fields to an entity that's defined in another service | bool | Y |
-/// | use_type_description | Specifies that the description of the type is on the type declaration. [`Description`]()(derive.Description.html) | 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 |
 ///
@@ -985,6 +985,9 @@ pub use async_graphql_derive::MergedObject;
 /// | Attribute     | description               | Type     | Optional |
 /// |---------------|---------------------------|----------|----------|
 /// | name          | Object name               | string   | Y        |
+/// | extends       | Add fields to an entity that's defined in another service | 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
 ///