Removing a few more Result<bool> . (#4977)

* Removing a few more Result<bool> .

* Running taplo fmt.

* Running fmt.

* Adding email taken test.

* Fixing tests.

* Adding back in missing admin check.

* Rename check_has_local_followers function.

api_tests/package.json

@@ -21,16 +21,16 @@
   },
   "devDependencies": {
     "@types/jest": "^29.5.12",
-    "@types/node": "^22.0.2",
-    "@typescript-eslint/eslint-plugin": "^8.0.0",
-    "@typescript-eslint/parser": "^8.0.0",
-    "eslint": "^9.8.0",
+    "@types/node": "^22.3.0",
+    "@typescript-eslint/eslint-plugin": "^8.1.0",
+    "@typescript-eslint/parser": "^8.1.0",
+    "eslint": "^9.9.0",
     "eslint-plugin-prettier": "^5.1.3",
     "jest": "^29.5.0",
     "lemmy-js-client": "0.20.0-alpha.11",
     "prettier": "^3.2.5",
     "ts-jest": "^29.1.0",
     "typescript": "^5.5.4",
-    "typescript-eslint": "^8.0.0"
+    "typescript-eslint": "^8.1.0"
   }
 }

api_tests/pnpm-lock.yaml

@@ -12,16 +12,16 @@ importers:
         specifier: ^29.5.12
         version: 29.5.12
       '@types/node':
-        specifier: ^22.0.2
+        specifier: ^22.3.0
         version: 22.3.0
       '@typescript-eslint/eslint-plugin':
-        specifier: ^8.0.0
+        specifier: ^8.1.0
         version: 8.1.0(@typescript-eslint/parser@8.1.0(eslint@9.9.0)(typescript@5.5.4))(eslint@9.9.0)(typescript@5.5.4)
       '@typescript-eslint/parser':
-        specifier: ^8.0.0
+        specifier: ^8.1.0
         version: 8.1.0(eslint@9.9.0)(typescript@5.5.4)
       eslint:
-        specifier: ^9.8.0
+        specifier: ^9.9.0
         version: 9.9.0
       eslint-plugin-prettier:
         specifier: ^5.1.3
@@ -42,7 +42,7 @@ importers:
         specifier: ^5.5.4
         version: 5.5.4
       typescript-eslint:
-        specifier: ^8.0.0
+        specifier: ^8.1.0
         version: 8.1.0(eslint@9.9.0)(typescript@5.5.4)
 
 packages:

api_tests/src/post.spec.ts

@@ -628,7 +628,7 @@ test("Enforce community ban for federated user", async () => {
   // Alpha tries to make post on beta, but it fails because of ban
   await expect(
     createPost(alpha, betaCommunity.community.id),
-  ).rejects.toStrictEqual(Error("banned_from_community"));
+  ).rejects.toStrictEqual(Error("person_is_banned_from_community"));
 
   // Unban alpha
   let unBanAlpha = await banPersonFromCommunity(

crates/api/src/community/add_mod.rs

@@ -52,15 +52,12 @@ pub async fn add_mod_to_community(
   // moderator. This is necessary because otherwise the action would be rejected
   // by the community's home instance.
   if local_user_view.local_user.admin && !community.local {
-    let is_mod = CommunityModeratorView::is_community_moderator(
+    CommunityModeratorView::check_is_community_moderator(
       &mut context.pool(),
       community.id,
       local_user_view.person.id,
     )
     .await?;
-    if !is_mod {
-      Err(LemmyErrorType::NotAModerator)?
-    }
   }
 
   // Update in local database

crates/api/src/local_user/save_settings.rs

@@ -63,9 +63,7 @@ pub async fn save_user_settings(
     let previous_email = local_user_view.local_user.email.clone().unwrap_or_default();
     // if email was changed, check that it is not taken and send verification mail
     if previous_email.deref() != email {
-      if LocalUser::is_email_taken(&mut context.pool(), email).await? {
-        return Err(LemmyErrorType::EmailAlreadyExists)?;
-      }
+      LocalUser::check_is_email_taken(&mut context.pool(), email).await?;
       send_verification_email(
         &local_user_view,
         email,

crates/api_common/src/claims.rs

@@ -29,13 +29,9 @@ impl Claims {
     let claims =
       decode::<Claims>(jwt, &key, &validation).with_lemmy_type(LemmyErrorType::NotLoggedIn)?;
     let user_id = LocalUserId(claims.claims.sub.parse()?);
-    let is_valid = LoginToken::validate(&mut context.pool(), user_id, jwt).await?;
-    if !is_valid {
-      Err(LemmyErrorType::NotLoggedIn)?
-    } else {
+    LoginToken::validate(&mut context.pool(), user_id, jwt).await?;
     Ok(user_id)
   }
-  }
 
   pub async fn generate(
     user_id: LocalUserId,

crates/api_common/src/utils.rs

@@ -73,13 +73,7 @@ pub async fn is_mod_or_admin(
   community_id: CommunityId,
 ) -> LemmyResult<()> {
   check_user_valid(person)?;
-
-  let is_mod_or_admin = CommunityView::is_mod_or_admin(pool, person.id, community_id).await?;
-  if !is_mod_or_admin {
-    Err(LemmyErrorType::NotAModOrAdmin)?
-  } else {
-    Ok(())
-  }
+  CommunityView::check_is_mod_or_admin(pool, person.id, community_id).await
 }
 
 #[tracing::instrument(skip_all)]
@@ -110,13 +104,7 @@ pub async fn check_community_mod_of_any_or_admin_action(
   let person = &local_user_view.person;
 
   check_user_valid(person)?;
-
-  let is_mod_of_any_or_admin = CommunityView::is_mod_of_any_or_admin(pool, person.id).await?;
-  if !is_mod_of_any_or_admin {
-    Err(LemmyErrorType::NotAModOrAdmin)?
-  } else {
-    Ok(())
-  }
+  CommunityView::check_is_mod_of_any_or_admin(pool, person.id).await
 }
 
 pub fn is_admin(local_user_view: &LocalUserView) -> LemmyResult<()> {
@@ -242,7 +230,7 @@ pub async fn check_community_user_action(
 ) -> LemmyResult<()> {
   check_user_valid(person)?;
   check_community_deleted_removed(community_id, pool).await?;
-  check_community_ban(person, community_id, pool).await?;
+  CommunityPersonBanView::check(pool, person.id, community_id).await?;
   Ok(())
 }
 
@@ -257,19 +245,6 @@ async fn check_community_deleted_removed(
   Ok(())
 }
 
-async fn check_community_ban(
-  person: &Person,
-  community_id: CommunityId,
-  pool: &mut DbPool<'_>,
-) -> LemmyResult<()> {
-  // check if user was banned from site or community
-  let is_banned = CommunityPersonBanView::get(pool, person.id, community_id).await?;
-  if is_banned {
-    Err(LemmyErrorType::BannedFromCommunity)?
-  }
-  Ok(())
-}
-
 /// Check that the given user can perform a mod action in the community.
 ///
 /// In particular it checks that he is an admin or mod, wasn't banned and the community isn't
@@ -281,7 +256,7 @@ pub async fn check_community_mod_action(
   pool: &mut DbPool<'_>,
 ) -> LemmyResult<()> {
   is_mod_or_admin(pool, person, community_id).await?;
-  check_community_ban(person, community_id, pool).await?;
+  CommunityPersonBanView::check(pool, person.id, community_id).await?;
 
   // it must be possible to restore deleted community
   if !allow_deleted {
@@ -307,51 +282,6 @@ pub fn check_comment_deleted_or_removed(comment: &Comment) -> LemmyResult<()> {
   }
 }
 
-/// Throws an error if a recipient has blocked a person.
-#[tracing::instrument(skip_all)]
-pub async fn check_person_block(
-  my_id: PersonId,
-  potential_blocker_id: PersonId,
-  pool: &mut DbPool<'_>,
-) -> LemmyResult<()> {
-  let is_blocked = PersonBlock::read(pool, potential_blocker_id, my_id).await?;
-  if is_blocked {
-    Err(LemmyErrorType::PersonIsBlocked)?
-  } else {
-    Ok(())
-  }
-}
-
-/// Throws an error if a recipient has blocked a community.
-#[tracing::instrument(skip_all)]
-async fn check_community_block(
-  community_id: CommunityId,
-  person_id: PersonId,
-  pool: &mut DbPool<'_>,
-) -> LemmyResult<()> {
-  let is_blocked = CommunityBlock::read(pool, person_id, community_id).await?;
-  if is_blocked {
-    Err(LemmyErrorType::CommunityIsBlocked)?
-  } else {
-    Ok(())
-  }
-}
-
-/// Throws an error if a recipient has blocked an instance.
-#[tracing::instrument(skip_all)]
-async fn check_instance_block(
-  instance_id: InstanceId,
-  person_id: PersonId,
-  pool: &mut DbPool<'_>,
-) -> LemmyResult<()> {
-  let is_blocked = InstanceBlock::read(pool, person_id, instance_id).await?;
-  if is_blocked {
-    Err(LemmyErrorType::InstanceIsBlocked)?
-  } else {
-    Ok(())
-  }
-}
-
 #[tracing::instrument(skip_all)]
 pub async fn check_person_instance_community_block(
   my_id: PersonId,
@@ -360,9 +290,9 @@ pub async fn check_person_instance_community_block(
   community_id: CommunityId,
   pool: &mut DbPool<'_>,
 ) -> LemmyResult<()> {
-  check_person_block(my_id, potential_blocker_id, pool).await?;
-  check_instance_block(community_instance_id, potential_blocker_id, pool).await?;
-  check_community_block(community_id, potential_blocker_id, pool).await?;
+  PersonBlock::read(pool, potential_blocker_id, my_id).await?;
+  InstanceBlock::read(pool, potential_blocker_id, community_instance_id).await?;
+  CommunityBlock::read(pool, potential_blocker_id, community_id).await?;
   Ok(())
 }
 

crates/api_crud/src/post/create.rs

@@ -95,15 +95,12 @@ pub async fn create_post(
   let community = Community::read(&mut context.pool(), community_id).await?;
   if community.posting_restricted_to_mods {
     let community_id = data.community_id;
-    let is_mod = CommunityModeratorView::is_community_moderator(
+    CommunityModeratorView::check_is_community_moderator(
       &mut context.pool(),
       community_id,
       local_user_view.local_user.person_id,
     )
     .await?;
-    if !is_mod {
-      Err(LemmyErrorType::OnlyModsCanPostInCommunity)?
-    }
   }
 
   // Only need to check if language is allowed in case user set it explicitly. When using default

crates/api_crud/src/private_message/create.rs

@@ -5,7 +5,6 @@ use lemmy_api_common::{
   private_message::{CreatePrivateMessage, PrivateMessageResponse},
   send_activity::{ActivityChannel, SendActivityData},
   utils::{
-    check_person_block,
     get_interface_language,
     get_url_blocklist,
     local_site_to_slur_regex,
@@ -16,6 +15,7 @@ use lemmy_api_common::{
 use lemmy_db_schema::{
   source::{
     local_site::LocalSite,
+    person_block::PersonBlock,
     private_message::{PrivateMessage, PrivateMessageInsertForm},
   },
   traits::Crud,
@@ -39,10 +39,10 @@ pub async fn create_private_message(
   let content = process_markdown(&data.content, &slur_regex, &url_blocklist, &context).await?;
   is_valid_body_field(&content, false)?;
 
-  check_person_block(
-    local_user_view.person.id,
-    data.recipient_id,
+  PersonBlock::read(
     &mut context.pool(),
+    data.recipient_id,
+    local_user_view.person.id,
   )
   .await?;
 

crates/api_crud/src/user/create.rs

@@ -92,9 +92,8 @@ pub async fn register(
   }
 
   if local_site.site_setup && local_site.captcha_enabled {
-    if let Some(captcha_uuid) = &data.captcha_uuid {
-      let uuid = uuid::Uuid::parse_str(captcha_uuid)?;
-      let check = CaptchaAnswer::check_captcha(
+    let uuid = uuid::Uuid::parse_str(&data.captcha_uuid.clone().unwrap_or_default())?;
+    CaptchaAnswer::check_captcha(
       &mut context.pool(),
       CheckCaptchaAnswer {
         uuid,
@@ -102,12 +101,6 @@ pub async fn register(
       },
     )
     .await?;
-      if !check {
-        Err(LemmyErrorType::CaptchaIncorrect)?
-      }
-    } else {
-      Err(LemmyErrorType::CaptchaIncorrect)?
-    }
   }
 
   let slur_regex = local_site_to_slur_regex(&local_site);
@@ -119,9 +112,7 @@ pub async fn register(
   }
 
   if let Some(email) = &data.email {
-    if LocalUser::is_email_taken(&mut context.pool(), email).await? {
-      Err(LemmyErrorType::EmailAlreadyExists)?
-    }
+    LocalUser::check_is_email_taken(&mut context.pool(), email).await?;
   }
 
   // We have to create both a person, and local_user

crates/apub/src/activities/community/announce.rs

@@ -213,15 +213,13 @@ async fn can_accept_activity_in_community(
   context: &Data<LemmyContext>,
 ) -> LemmyResult<()> {
   if let Some(community) = community {
-    if !community.local
-      && !CommunityFollower::has_local_followers(&mut context.pool(), community.id).await?
-    {
-      Err(LemmyErrorType::CommunityHasNoFollowers)?
-    }
     // Local only community can't federate
     if community.visibility != CommunityVisibility::Public {
       return Err(LemmyErrorType::NotFound.into());
     }
+    if !community.local {
+      CommunityFollower::check_has_local_followers(&mut context.pool(), community.id).await?
+    }
   }
   Ok(())
 }

crates/apub/src/activities/mod.rs

@@ -87,12 +87,7 @@ pub(crate) async fn verify_person_in_community(
   }
   let person_id = person.id;
   let community_id = community.id;
-  let is_banned = CommunityPersonBanView::get(&mut context.pool(), person_id, community_id).await?;
-  if is_banned {
-    Err(LemmyErrorType::PersonIsBannedFromCommunity)?
-  } else {
-    Ok(())
-  }
+  CommunityPersonBanView::check(&mut context.pool(), person_id, community_id).await
 }
 
 /// Verify that mod action in community was performed by a moderator.
@@ -106,14 +101,6 @@ pub(crate) async fn verify_mod_action(
   community: &Community,
   context: &Data<LemmyContext>,
 ) -> LemmyResult<()> {
-  let mod_ = mod_id.dereference(context).await?;
-
-  let is_mod_or_admin =
-    CommunityView::is_mod_or_admin(&mut context.pool(), mod_.id, community.id).await?;
-  if is_mod_or_admin {
-    return Ok(());
-  }
-
   // mod action comes from the same instance as the community, so it was presumably done
   // by an instance admin.
   // TODO: federate instance admin status and check it here
@@ -121,7 +108,8 @@ pub(crate) async fn verify_mod_action(
     return Ok(());
   }
 
-  Err(LemmyErrorType::NotAModerator)?
+  let mod_ = mod_id.dereference(context).await?;
+  CommunityView::check_is_mod_or_admin(&mut context.pool(), mod_.id, community.id).await
 }
 
 pub(crate) fn verify_is_public(to: &[Url], cc: &[Url]) -> LemmyResult<()> {

crates/apub/src/objects/post.rs

@@ -39,7 +39,7 @@ use lemmy_db_schema::{
 };
 use lemmy_db_views_actor::structs::CommunityModeratorView;
 use lemmy_utils::{
-  error::{LemmyError, LemmyErrorType, LemmyResult},
+  error::{LemmyError, LemmyResult},
   spawn_try_task,
   utils::{
     markdown::markdown_to_html,
@@ -180,15 +180,12 @@ impl Object for ApubPost {
     let creator = page.creator()?.dereference(context).await?;
     let community = page.community(context).await?;
     if community.posting_restricted_to_mods {
-      let is_mod = CommunityModeratorView::is_community_moderator(
+      CommunityModeratorView::check_is_community_moderator(
         &mut context.pool(),
         community.id,
         creator.id,
       )
       .await?;
-      if !is_mod {
-        Err(LemmyErrorType::OnlyModsCanPostInCommunity)?
-      }
     }
     let mut name = page
       .name

crates/apub/src/objects/private_message.rs

@@ -15,12 +15,13 @@ use activitypub_federation::{
 use chrono::{DateTime, Utc};
 use lemmy_api_common::{
   context::LemmyContext,
-  utils::{check_person_block, get_url_blocklist, local_site_opt_to_slur_regex, process_markdown},
+  utils::{get_url_blocklist, local_site_opt_to_slur_regex, process_markdown},
 };
 use lemmy_db_schema::{
   source::{
     local_site::LocalSite,
     person::Person,
+    person_block::PersonBlock,
     private_message::{PrivateMessage, PrivateMessageInsertForm},
   },
   traits::Crud,
@@ -126,7 +127,7 @@ impl Object for ApubPrivateMessage {
   ) -> LemmyResult<ApubPrivateMessage> {
     let creator = note.attributed_to.dereference(context).await?;
     let recipient = note.to[0].dereference(context).await?;
-    check_person_block(creator.id, recipient.id, &mut context.pool()).await?;
+    PersonBlock::read(&mut context.pool(), recipient.id, creator.id).await?;
 
     let local_site = LocalSite::read(&mut context.pool()).await.ok();
     let slur_regex = &local_site_opt_to_slur_regex(&local_site);

crates/db_schema/src/impls/captcha_answer.rs

@@ -13,6 +13,7 @@ use diesel::{
   QueryDsl,
 };
 use diesel_async::RunQueryDsl;
+use lemmy_utils::{error::LemmyResult, LemmyErrorType};
 
 impl CaptchaAnswer {
   pub async fn insert(pool: &mut DbPool<'_>, captcha: &CaptchaAnswerForm) -> Result<Self, Error> {
@@ -27,7 +28,7 @@ impl CaptchaAnswer {
   pub async fn check_captcha(
     pool: &mut DbPool<'_>,
     to_check: CheckCaptchaAnswer,
-  ) -> Result<bool, Error> {
+  ) -> LemmyResult<()> {
     let conn = &mut get_conn(pool).await?;
 
     // fetch requested captcha
@@ -43,7 +44,9 @@ impl CaptchaAnswer {
       .execute(conn)
       .await?;
 
-    Ok(captcha_exists)
+    captcha_exists
+      .then_some(())
+      .ok_or(LemmyErrorType::CaptchaIncorrect.into())
   }
 }
 
@@ -83,7 +86,6 @@ mod tests {
     .await;
 
     assert!(result.is_ok());
-    assert!(result.unwrap());
   }
 
   #[tokio::test]
@@ -119,7 +121,6 @@ mod tests {
     )
     .await;
 
-    assert!(result_repeat.is_ok());
-    assert!(!result_repeat.unwrap());
+    assert!(result_repeat.is_err());
   }
 }

crates/db_schema/src/impls/community.rs

@@ -35,8 +35,7 @@ use crate::{
 use chrono::{DateTime, Utc};
 use diesel::{
   deserialize,
-  dsl,
-  dsl::{exists, insert_into},
+  dsl::{self, exists, insert_into},
   pg::Pg,
   result::Error,
   select,
@@ -320,16 +319,18 @@ impl CommunityFollower {
 
   /// Check if a remote instance has any followers on local instance. For this it is enough to check
   /// if any follow relation is stored. Dont use this for local community.
-  pub async fn has_local_followers(
+  pub async fn check_has_local_followers(
     pool: &mut DbPool<'_>,
     remote_community_id: CommunityId,
-  ) -> Result<bool, Error> {
+  ) -> LemmyResult<()> {
     let conn = &mut get_conn(pool).await?;
     select(exists(community_follower::table.filter(
       community_follower::community_id.eq(remote_community_id),
     )))
-    .get_result(conn)
-    .await
+    .get_result::<bool>(conn)
+    .await?
+    .then_some(())
+    .ok_or(LemmyErrorType::CommunityHasNoFollowers.into())
   }
 }
 

crates/db_schema/src/impls/community_block.rs

@@ -9,26 +9,29 @@ use crate::{
   utils::{get_conn, DbPool},
 };
 use diesel::{
-  dsl::{exists, insert_into},
+  dsl::{exists, insert_into, not},
   result::Error,
   select,
   ExpressionMethods,
   QueryDsl,
 };
 use diesel_async::RunQueryDsl;
+use lemmy_utils::{error::LemmyResult, LemmyErrorType};
 
 impl CommunityBlock {
   pub async fn read(
     pool: &mut DbPool<'_>,
     for_person_id: PersonId,
     for_community_id: CommunityId,
-  ) -> Result<bool, Error> {
+  ) -> LemmyResult<()> {
     let conn = &mut get_conn(pool).await?;
-    select(exists(
+    select(not(exists(
       community_block::table.find((for_person_id, for_community_id)),
-    ))
-    .get_result(conn)
-    .await
+    )))
+    .get_result::<bool>(conn)
+    .await?
+    .then_some(())
+    .ok_or(LemmyErrorType::CommunityIsBlocked.into())
   }
 
   pub async fn for_person(

crates/db_schema/src/impls/instance_block.rs

@@ -9,26 +9,29 @@ use crate::{
   utils::{get_conn, DbPool},
 };
 use diesel::{
-  dsl::{exists, insert_into},
+  dsl::{exists, insert_into, not},
   result::Error,
   select,
   ExpressionMethods,
   QueryDsl,
 };
 use diesel_async::RunQueryDsl;
+use lemmy_utils::{error::LemmyResult, LemmyErrorType};
 
 impl InstanceBlock {
   pub async fn read(
     pool: &mut DbPool<'_>,
     for_person_id: PersonId,
     for_instance_id: InstanceId,
-  ) -> Result<bool, Error> {
+  ) -> LemmyResult<()> {
     let conn = &mut get_conn(pool).await?;
-    select(exists(
+    select(not(exists(
       instance_block::table.find((for_person_id, for_instance_id)),
-    ))
-    .get_result(conn)
-    .await
+    )))
+    .get_result::<bool>(conn)
+    .await?
+    .then_some(())
+    .ok_or(LemmyErrorType::InstanceIsBlocked.into())
   }
 
   pub async fn for_person(

crates/db_schema/src/impls/local_user.rs

@@ -136,14 +136,16 @@ impl LocalUser {
     diesel::delete(persons).execute(conn).await
   }
 
-  pub async fn is_email_taken(pool: &mut DbPool<'_>, email: &str) -> Result<bool, Error> {
+  pub async fn check_is_email_taken(pool: &mut DbPool<'_>, email: &str) -> LemmyResult<()> {
     use diesel::dsl::{exists, select};
     let conn = &mut get_conn(pool).await?;
-    select(exists(local_user::table.filter(
+    select(not(exists(local_user::table.filter(
       lower(coalesce(local_user::email, "")).eq(email.to_lowercase()),
-    )))
-    .get_result(conn)
-    .await
+    ))))
+    .get_result::<bool>(conn)
+    .await?
+    .then_some(())
+    .ok_or(LemmyErrorType::EmailAlreadyExists.into())
   }
 
   // TODO: maybe move this and pass in LocalUserView
@@ -419,4 +421,32 @@ mod tests {
 
     Ok(())
   }
+
+  #[tokio::test]
+  #[serial]
+  async fn test_email_taken() -> LemmyResult<()> {
+    let pool = &build_db_pool_for_tests().await;
+    let pool = &mut pool.into();
+
+    let darwin_email = "charles.darwin@gmail.com";
+
+    let inserted_instance = Instance::read_or_create(pool, "my_domain.tld".to_string()).await?;
+
+    let darwin_person = PersonInsertForm::test_form(inserted_instance.id, "darwin");
+    let inserted_darwin_person = Person::create(pool, &darwin_person).await?;
+
+    let mut darwin_local_user_form =
+      LocalUserInsertForm::test_form_admin(inserted_darwin_person.id);
+    darwin_local_user_form.email = Some(darwin_email.into());
+    let _inserted_darwin_local_user =
+      LocalUser::create(pool, &darwin_local_user_form, vec![]).await?;
+
+    let check = LocalUser::check_is_email_taken(pool, darwin_email).await;
+    assert!(check.is_err());
+
+    let passed_check = LocalUser::check_is_email_taken(pool, "not_charles@gmail.com").await;
+    assert!(passed_check.is_ok());
+
+    Ok(())
+  }
 }

crates/db_schema/src/impls/login_token.rs

@@ -7,6 +7,7 @@ use crate::{
 };
 use diesel::{delete, dsl::exists, insert_into, result::Error, select};
 use diesel_async::RunQueryDsl;
+use lemmy_utils::{error::LemmyResult, LemmyErrorType};
 
 impl LoginToken {
   pub async fn create(pool: &mut DbPool<'_>, form: LoginTokenCreateForm) -> Result<Self, Error> {
@@ -22,13 +23,15 @@ impl LoginToken {
     pool: &mut DbPool<'_>,
     user_id_: LocalUserId,
     token_: &str,
-  ) -> Result<bool, Error> {
+  ) -> LemmyResult<()> {
     let conn = &mut get_conn(pool).await?;
     select(exists(
       login_token.find(token_).filter(user_id.eq(user_id_)),
     ))
-    .get_result(conn)
-    .await
+    .get_result::<bool>(conn)
+    .await?
+    .then_some(())
+    .ok_or(LemmyErrorType::NotLoggedIn.into())
   }
 
   pub async fn list(

crates/db_schema/src/impls/person_block.rs

@@ -9,7 +9,7 @@ use crate::{
   utils::{get_conn, DbPool},
 };
 use diesel::{
-  dsl::{exists, insert_into},
+  dsl::{exists, insert_into, not},
   result::Error,
   select,
   ExpressionMethods,
@@ -17,19 +17,22 @@ use diesel::{
   QueryDsl,
 };
 use diesel_async::RunQueryDsl;
+use lemmy_utils::{error::LemmyResult, LemmyErrorType};
 
 impl PersonBlock {
   pub async fn read(
     pool: &mut DbPool<'_>,
     for_person_id: PersonId,
     for_recipient_id: PersonId,
-  ) -> Result<bool, Error> {
+  ) -> LemmyResult<()> {
     let conn = &mut get_conn(pool).await?;
-    select(exists(
+    select(not(exists(
       person_block::table.find((for_person_id, for_recipient_id)),
-    ))
-    .get_result(conn)
-    .await
+    )))
+    .get_result::<bool>(conn)
+    .await?
+    .then_some(())
+    .ok_or(LemmyErrorType::PersonIsBlocked.into())
   }
 
   pub async fn for_person(

crates/db_views_actor/Cargo.toml

@@ -15,7 +15,13 @@ doctest = false
 workspace = true
 
 [features]
-full = ["lemmy_db_schema/full", "diesel", "diesel-async", "ts-rs"]
+full = [
+  "lemmy_db_schema/full",
+  "lemmy_utils/full",
+  "diesel",
+  "diesel-async",
+  "ts-rs",
+]
 
 [dependencies]
 lemmy_db_schema = { workspace = true }
@@ -33,6 +39,7 @@ serde_with = { workspace = true }
 ts-rs = { workspace = true, optional = true }
 chrono.workspace = true
 strum = { workspace = true }
+lemmy_utils = { workspace = true, optional = true }
 
 [dev-dependencies]
 serial_test = { workspace = true }

crates/db_views_actor/src/community_moderator_view.rs

@@ -8,13 +8,14 @@ use lemmy_db_schema::{
   source::local_user::LocalUser,
   utils::{get_conn, DbPool},
 };
+use lemmy_utils::{error::LemmyResult, LemmyErrorType};
 
 impl CommunityModeratorView {
-  pub async fn is_community_moderator(
+  pub async fn check_is_community_moderator(
     pool: &mut DbPool<'_>,
     find_community_id: CommunityId,
     find_person_id: PersonId,
-  ) -> Result<bool, Error> {
+  ) -> LemmyResult<()> {
     use lemmy_db_schema::schema::community_moderator::dsl::{
       community_id,
       community_moderator,
@@ -27,20 +28,24 @@ impl CommunityModeratorView {
         .filter(person_id.eq(find_person_id)),
     ))
     .get_result::<bool>(conn)
-    .await
+    .await?
+    .then_some(())
+    .ok_or(LemmyErrorType::NotAModerator.into())
   }
 
   pub(crate) async fn is_community_moderator_of_any(
     pool: &mut DbPool<'_>,
     find_person_id: PersonId,
-  ) -> Result<bool, Error> {
+  ) -> LemmyResult<()> {
     use lemmy_db_schema::schema::community_moderator::dsl::{community_moderator, person_id};
     let conn = &mut get_conn(pool).await?;
     select(exists(
       community_moderator.filter(person_id.eq(find_person_id)),
     ))
     .get_result::<bool>(conn)
-    .await
+    .await?
+    .then_some(())
+    .ok_or(LemmyErrorType::NotAModerator.into())
   }
 
   pub async fn for_community(

crates/db_views_actor/src/community_person_ban_view.rs

@@ -1,25 +1,33 @@
 use crate::structs::CommunityPersonBanView;
-use diesel::{dsl::exists, result::Error, select, ExpressionMethods, QueryDsl};
+use diesel::{
+  dsl::{exists, not},
+  select,
+  ExpressionMethods,
+  QueryDsl,
+};
 use diesel_async::RunQueryDsl;
 use lemmy_db_schema::{
   newtypes::{CommunityId, PersonId},
   schema::community_person_ban,
   utils::{get_conn, DbPool},
 };
+use lemmy_utils::{error::LemmyResult, LemmyErrorType};
 
 impl CommunityPersonBanView {
-  pub async fn get(
+  pub async fn check(
     pool: &mut DbPool<'_>,
     from_person_id: PersonId,
     from_community_id: CommunityId,
-  ) -> Result<bool, Error> {
+  ) -> LemmyResult<()> {
     let conn = &mut get_conn(pool).await?;
-    select(exists(
+    select(not(exists(
       community_person_ban::table
         .filter(community_person_ban::community_id.eq(from_community_id))
         .filter(community_person_ban::person_id.eq(from_person_id)),
-    ))
+    )))
     .get_result::<bool>(conn)
-    .await
+    .await?
+    .then_some(())
+    .ok_or(LemmyErrorType::PersonIsBannedFromCommunity.into())
   }
 }

crates/db_views_actor/src/community_view.rs

@@ -26,6 +26,7 @@ use lemmy_db_schema::{
   ListingType,
   PostSortType,
 };
+use lemmy_utils::{error::LemmyResult, LemmyErrorType};
 
 fn queries<'a>() -> Queries<
   impl ReadFn<'a, CommunityView, (CommunityId, Option<&'a LocalUser>, bool)>,
@@ -185,35 +186,39 @@ impl CommunityView {
       .await
   }
 
-  pub async fn is_mod_or_admin(
+  pub async fn check_is_mod_or_admin(
     pool: &mut DbPool<'_>,
     person_id: PersonId,
     community_id: CommunityId,
-  ) -> Result<bool, Error> {
+  ) -> LemmyResult<()> {
     let is_mod =
-      CommunityModeratorView::is_community_moderator(pool, community_id, person_id).await?;
-    if is_mod {
-      Ok(true)
-    } else if let Ok(person_view) = PersonView::read(pool, person_id).await {
-      Ok(person_view.is_admin)
+      CommunityModeratorView::check_is_community_moderator(pool, community_id, person_id).await;
+    if is_mod.is_ok()
+      || PersonView::read(pool, person_id)
+        .await
+        .is_ok_and(|t| t.is_admin)
+    {
+      Ok(())
     } else {
-      Ok(false)
+      Err(LemmyErrorType::NotAModOrAdmin)?
     }
   }
 
   /// Checks if a person is an admin, or moderator of any community.
-  pub async fn is_mod_of_any_or_admin(
+  pub async fn check_is_mod_of_any_or_admin(
     pool: &mut DbPool<'_>,
     person_id: PersonId,
-  ) -> Result<bool, Error> {
+  ) -> LemmyResult<()> {
     let is_mod_of_any =
-      CommunityModeratorView::is_community_moderator_of_any(pool, person_id).await?;
-    if is_mod_of_any {
-      Ok(true)
-    } else if let Ok(person_view) = PersonView::read(pool, person_id).await {
-      Ok(person_view.is_admin)
+      CommunityModeratorView::is_community_moderator_of_any(pool, person_id).await;
+    if is_mod_of_any.is_ok()
+      || PersonView::read(pool, person_id)
+        .await
+        .is_ok_and(|t| t.is_admin)
+    {
+      Ok(())
     } else {
-      Ok(false)
+      Err(LemmyErrorType::NotAModOrAdmin)?
     }
   }
 }