Allow importing partial backup (fixes #4672) (#4705)

* Allow importing partial backup (fixes #4672)

* Dont throw error on empty LocalUser::update

* fix tests

crates/api/src/local_user/add_admin.rs

@@ -29,7 +29,7 @@ pub async fn add_admin(
     .await?
     .ok_or(LemmyErrorType::ObjectNotLocal)?;
 
-  let added_admin = LocalUser::update(
+  LocalUser::update(
     &mut context.pool(),
     added_local_user.local_user.id,
     &LocalUserUpdateForm {
@@ -43,7 +43,7 @@ pub async fn add_admin(
   // Mod tables
   let form = ModAddForm {
     mod_person_id: local_user_view.person.id,
-    other_person_id: added_admin.person_id,
+    other_person_id: added_local_user.person.id,
     removed: Some(!data.added),
   };
 

crates/api/src/local_user/save_settings.rs

@@ -141,11 +141,7 @@ pub async fn save_user_settings(
     ..Default::default()
   };
 
-  // Ignore errors, because 'no fields updated' will return an error.
-  // https://github.com/LemmyNet/lemmy/issues/4076
-  LocalUser::update(&mut context.pool(), local_user_id, &local_user_form)
-    .await
-    .ok();
+  LocalUser::update(&mut context.pool(), local_user_id, &local_user_form).await?;
 
   // Update the vote display modes
   let vote_display_modes_form = LocalUserVoteDisplayModeUpdateForm {

crates/api/src/local_user/verify_email.rs

@@ -9,12 +9,10 @@ use lemmy_db_schema::{
   source::{
     email_verification::EmailVerification,
     local_user::{LocalUser, LocalUserUpdateForm},
-    person::Person,
   },
-  traits::Crud,
   RegistrationMode,
 };
-use lemmy_db_views::structs::SiteView;
+use lemmy_db_views::structs::{LocalUserView, SiteView};
 use lemmy_utils::error::{LemmyErrorType, LemmyResult};
 
 pub async fn verify_email(
@@ -38,7 +36,7 @@ pub async fn verify_email(
   };
   let local_user_id = verification.local_user_id;
 
-  let local_user = LocalUser::update(&mut context.pool(), local_user_id, &form).await?;
+  LocalUser::update(&mut context.pool(), local_user_id, &form).await?;
 
   EmailVerification::delete_old_tokens_for_local_user(&mut context.pool(), local_user_id).await?;
 
@@ -46,11 +44,15 @@ pub async fn verify_email(
   if site_view.local_site.registration_mode == RegistrationMode::RequireApplication
     && site_view.local_site.application_email_admins
   {
-    let person = Person::read(&mut context.pool(), local_user.person_id)
+    let local_user = LocalUserView::read(&mut context.pool(), local_user_id)
       .await?
       .ok_or(LemmyErrorType::CouldntFindPerson)?;
 
-    send_new_applicant_email_to_admins(&person.name, &mut context.pool(), context.settings())
+    send_new_applicant_email_to_admins(
+      &local_user.person.name,
+      &mut context.pool(),
+      context.settings(),
+    )
     .await?;
   }
 

crates/apub/src/api/user_settings_backup.rs

@@ -40,7 +40,7 @@ use tracing::info;
 ///
 /// Be careful with any changes to this struct, to avoid breaking changes which could prevent
 /// importing older backups.
-#[derive(Debug, Serialize, Deserialize, Clone)]
+#[derive(Debug, Serialize, Deserialize, Clone, Default)]
 pub struct UserSettingsBackup {
   pub display_name: Option<String>,
   pub bio: Option<String>,
@@ -322,7 +322,7 @@ pub async fn import_settings(
 #[allow(clippy::indexing_slicing)]
 mod tests {
 
-  use crate::api::user_settings_backup::{export_settings, import_settings};
+  use crate::api::user_settings_backup::{export_settings, import_settings, UserSettingsBackup};
   use activitypub_federation::config::Data;
   use lemmy_api_common::context::LemmyContext;
   use lemmy_db_schema::{
@@ -420,6 +420,44 @@ mod tests {
     Ok(())
   }
 
+  #[tokio::test]
+  #[serial]
+  async fn test_settings_partial_import() -> LemmyResult<()> {
+    let context = LemmyContext::init_test_context().await;
+
+    let export_user =
+      create_user("hanna".to_string(), Some("my bio".to_string()), &context).await?;
+
+    let community_form = CommunityInsertForm::builder()
+      .name("testcom".to_string())
+      .title("testcom".to_string())
+      .instance_id(export_user.person.instance_id)
+      .build();
+    let community = Community::create(&mut context.pool(), &community_form).await?;
+    let follower_form = CommunityFollowerForm {
+      community_id: community.id,
+      person_id: export_user.person.id,
+      pending: false,
+    };
+    CommunityFollower::follow(&mut context.pool(), &follower_form).await?;
+
+    let backup = export_settings(export_user.clone(), context.reset_request_count()).await?;
+
+    let import_user = create_user("charles".to_string(), None, &context).await?;
+
+    let backup2 = UserSettingsBackup {
+      followed_communities: backup.followed_communities.clone(),
+      ..Default::default()
+    };
+    import_settings(
+      actix_web::web::Json(backup2),
+      import_user.clone(),
+      context.reset_request_count(),
+    )
+    .await?;
+    Ok(())
+  }
+
   #[tokio::test]
   #[serial]
   async fn disallow_large_backup() -> LemmyResult<()> {

crates/db_schema/src/impls/local_user.rs

@@ -55,12 +55,17 @@ impl LocalUser {
     pool: &mut DbPool<'_>,
     local_user_id: LocalUserId,
     form: &LocalUserUpdateForm,
-  ) -> Result<LocalUser, Error> {
+  ) -> Result<usize, Error> {
     let conn = &mut get_conn(pool).await?;
-    diesel::update(local_user::table.find(local_user_id))
+    let res = diesel::update(local_user::table.find(local_user_id))
       .set(form)
-      .get_result::<Self>(conn)
-      .await
+      .execute(conn)
+      .await;
+    // Diesel will throw an error if the query is all Nones (not updating anything), ignore this.
+    match res {
+      Err(Error::QueryBuilderError(_)) => Ok(0),
+      other => other,
+    }
   }
 
   pub async fn delete(pool: &mut DbPool<'_>, id: LocalUserId) -> Result<usize, Error> {

crates/db_views/src/post_view.rs

@@ -950,9 +950,8 @@ mod tests {
       show_bot_accounts: Some(false),
       ..Default::default()
     };
-    let inserted_local_user =
     LocalUser::update(pool, data.local_user_view.local_user.id, &local_user_form).await?;
-    data.local_user_view.local_user = inserted_local_user;
+    data.local_user_view.local_user.show_bot_accounts = false;
 
     let read_post_listing = PostQuery {
       community_id: Some(data.inserted_community.id),
@@ -986,9 +985,8 @@ mod tests {
       show_bot_accounts: Some(true),
       ..Default::default()
     };
-    let inserted_local_user =
     LocalUser::update(pool, data.local_user_view.local_user.id, &local_user_form).await?;
-    data.local_user_view.local_user = inserted_local_user;
+    data.local_user_view.local_user.show_bot_accounts = true;
 
     let post_listings_with_bots = PostQuery {
       community_id: Some(data.inserted_community.id),
@@ -1110,9 +1108,8 @@ mod tests {
       show_bot_accounts: Some(false),
       ..Default::default()
     };
-    let inserted_local_user =
     LocalUser::update(pool, data.local_user_view.local_user.id, &local_user_form).await?;
-    data.local_user_view.local_user = inserted_local_user;
+    data.local_user_view.local_user.show_bot_accounts = false;
 
     let read_post_listing = PostQuery {
       community_id: Some(data.inserted_community.id),
@@ -1533,9 +1530,8 @@ mod tests {
       show_read_posts: Some(false),
       ..Default::default()
     };
-    let inserted_local_user =
     LocalUser::update(pool, data.local_user_view.local_user.id, &local_user_form).await?;
-    data.local_user_view.local_user = inserted_local_user;
+    data.local_user_view.local_user.show_read_posts = false;
 
     // Mark a post as read
     PostRead::mark_as_read(