Use an associated type instead of Generic.

server/src/apub/community.rs

@@ -5,7 +5,9 @@ pub struct CommunityQuery {
   community_name: String,
 }
 
-impl ToApub<GroupExt> for Community {
+impl ToApub for Community {
+  type Response = GroupExt;
+
   // Turn a Lemmy Community into an ActivityPub group that can be sent out over the network.
   fn to_apub(&self, conn: &PgConnection) -> Result<GroupExt, Error> {
     let mut group = Group::default();
@@ -52,7 +54,9 @@ impl ActorType for Community {
   }
 }
 
-impl FromApub<GroupExt> for CommunityForm {
+impl FromApub for CommunityForm {
+  type ApubType = GroupExt;
+
   /// Parse an ActivityPub group received from another instance into a Lemmy community.
   fn from_apub(group: &GroupExt, conn: &PgConnection) -> Result<Self, Error> {
     let oprops = &group.base.base.object_props;

server/src/apub/mod.rs

@@ -126,12 +126,14 @@ fn is_apub_id_valid(apub_id: &Url) -> bool {
 }
 
 // TODO Not sure good names for these
-pub trait ToApub<Response> {
+pub trait ToApub {
-  fn to_apub(&self, conn: &PgConnection) -> Result<Response, Error>;
+  type Response;
+  fn to_apub(&self, conn: &PgConnection) -> Result<Self::Response, Error>;
 }
 
-pub trait FromApub<ApubType> {
+pub trait FromApub {
-  fn from_apub(apub: &ApubType, conn: &PgConnection) -> Result<Self, Error>
+  type ApubType;
+  fn from_apub(apub: &Self::ApubType, conn: &PgConnection) -> Result<Self, Error>
   where
     Self: Sized;
 }

server/src/apub/post.rs

@@ -15,7 +15,9 @@ pub async fn get_apub_post(
   Ok(create_apub_response(&post.to_apub(&db.get().unwrap())?))
 }
 
-impl ToApub<Page> for Post {
+impl ToApub for Post {
+  type Response = Page;
+
   // Turn a Lemmy post into an ActivityPub page that can be sent out over the network.
   fn to_apub(&self, conn: &PgConnection) -> Result<Page, Error> {
     let mut page = Page::default();
@@ -53,7 +55,9 @@ impl ToApub<Page> for Post {
   }
 }
 
-impl FromApub<Page> for PostForm {
+impl FromApub for PostForm {
+  type ApubType = Page;
+
   /// Parse an ActivityPub page received from another instance into a Lemmy post.
   fn from_apub(page: &Page, conn: &PgConnection) -> Result<PostForm, Error> {
     let oprops = &page.object_props;

server/src/apub/user.rs

@@ -5,7 +5,9 @@ pub struct UserQuery {
   user_name: String,
 }
 
-impl ToApub<PersonExt> for User_ {
+impl ToApub for User_ {
+  type Response = PersonExt;
+
   // Turn a Lemmy Community into an ActivityPub group that can be sent out over the network.
   fn to_apub(&self, _conn: &PgConnection) -> Result<PersonExt, Error> {
     // TODO go through all these to_string and to_owned()
@@ -50,7 +52,8 @@ impl ActorType for User_ {
   }
 }
 
-impl FromApub<PersonExt> for UserForm {
+impl FromApub for UserForm {
+  type ApubType = PersonExt;
   /// Parse an ActivityPub person received from another instance into a Lemmy user.
   fn from_apub(person: &PersonExt, _conn: &PgConnection) -> Result<Self, Error> {
     let oprops = &person.base.base.object_props;