crates/db_views/src/comment_view.rs

   1 use crate::structs::CommentView;
   2 use diesel::{
   3   result::Error,
   4   BoolExpressionMethods,
   5   ExpressionMethods,
   6   JoinOnDsl,
   7   NullableExpressionMethods,
   8   PgTextExpressionMethods,
   9   QueryDsl,
  10 };
  11 use diesel_async::RunQueryDsl;
  12 use diesel_ltree::{nlevel, subpath, Ltree, LtreeExtensions};
  13 use lemmy_db_schema::{
  14   aggregates::structs::CommentAggregates,
  15   newtypes::{CommentId, CommunityId, LocalUserId, PersonId, PostId},
  16   schema::{
  17     comment,
  18     comment_aggregates,
  19     comment_like,
  20     comment_saved,
  21     community,
  22     community_block,
  23     community_follower,
  24     community_person_ban,
  25     local_user_language,
  26     person,
  27     person_block,
  28     post,
  29   },
  30   source::{
  31     comment::{Comment, CommentSaved},
  32     community::{Community, CommunityFollower, CommunityPersonBan},
  33     local_user::LocalUser,
  34     person::Person,
  35     person_block::PersonBlock,
  36     post::Post,
  37   },
  38   traits::JoinView,
  39   utils::{fuzzy_search, get_conn, limit_and_offset, DbPool},
  40   CommentSortType,
  41   ListingType,
  42 };
  43
  44 type CommentViewTuple = (
  45   Comment,
  46   Person,
  47   Post,
  48   Community,
  49   CommentAggregates,
  50   Option<CommunityPersonBan>,
  51   Option<CommunityFollower>,
  52   Option<CommentSaved>,
  53   Option<PersonBlock>,
  54   Option<i16>,
  55 );
  56
  57 impl CommentView {
  58   pub async fn read(
  59     pool: &mut DbPool<'_>,
  60     comment_id: CommentId,
  61     my_person_id: Option<PersonId>,
  62   ) -> Result<Self, Error> {
  63     let conn = &mut get_conn(pool).await?;
  64
  65     // The left join below will return None in this case
  66     let person_id_join = my_person_id.unwrap_or(PersonId(-1));
  67
  68     let (
  69       comment,
  70       creator,
  71       post,
  72       community,
  73       counts,
  74       creator_banned_from_community,
  75       follower,
  76       saved,
  77       creator_blocked,
  78       comment_like,
  79     ) = comment::table
  80       .find(comment_id)
  81       .inner_join(person::table)
  82       .inner_join(post::table)
  83       .inner_join(community::table.on(post::community_id.eq(community::id)))
  84       .inner_join(comment_aggregates::table)
  85       .left_join(
  86         community_person_ban::table.on(
  87           community::id
  88             .eq(community_person_ban::community_id)
  89             .and(community_person_ban::person_id.eq(comment::creator_id)),
  90         ),
  91       )
  92       .left_join(
  93         community_follower::table.on(
  94           post::community_id
  95             .eq(community_follower::community_id)
  96             .and(community_follower::person_id.eq(person_id_join)),
  97         ),
  98       )
  99       .left_join(
 100         comment_saved::table.on(
 101           comment::id
 102             .eq(comment_saved::comment_id)
 103             .and(comment_saved::person_id.eq(person_id_join)),
 104         ),
 105       )
 106       .left_join(
 107         person_block::table.on(
 108           comment::creator_id
 109             .eq(person_block::target_id)
 110             .and(person_block::person_id.eq(person_id_join)),
 111         ),
 112       )
 113       .left_join(
 114         comment_like::table.on(
 115           comment::id
 116             .eq(comment_like::comment_id)
 117             .and(comment_like::person_id.eq(person_id_join)),
 118         ),
 119       )
 120       .select((
 121         comment::all_columns,
 122         person::all_columns,
 123         post::all_columns,
 124         community::all_columns,
 125         comment_aggregates::all_columns,
 126         community_person_ban::all_columns.nullable(),
 127         community_follower::all_columns.nullable(),
 128         comment_saved::all_columns.nullable(),
 129         person_block::all_columns.nullable(),
 130         comment_like::score.nullable(),
 131       ))
 132       .first::<CommentViewTuple>(conn)
 133       .await?;
 134
 135     // If a person is given, then my_vote, if None, should be 0, not null
 136     // Necessary to differentiate between other person's votes
 137     let my_vote = if my_person_id.is_some() && comment_like.is_none() {
 138       Some(0)
 139     } else {
 140       comment_like
 141     };
 142
 143     Ok(CommentView {
 144       comment,
 145       post,
 146       creator,
 147       community,
 148       counts,
 149       creator_banned_from_community: creator_banned_from_community.is_some(),
 150       subscribed: CommunityFollower::to_subscribed_type(&follower),
 151       saved: saved.is_some(),
 152       creator_blocked: creator_blocked.is_some(),
 153       my_vote,
 154     })
 155   }
 156 }
 157
 158 #[derive(Default)]
 159 pub struct CommentQuery<'a> {
 160   pub listing_type: Option<ListingType>,
 161   pub sort: Option<CommentSortType>,
 162   pub community_id: Option<CommunityId>,
 163   pub post_id: Option<PostId>,
 164   pub parent_path: Option<Ltree>,
 165   pub creator_id: Option<PersonId>,
 166   pub local_user: Option<&'a LocalUser>,
 167   pub search_term: Option<String>,
 168   pub saved_only: Option<bool>,
 169   pub show_deleted_and_removed: Option<bool>,
 170   pub page: Option<i64>,
 171   pub limit: Option<i64>,
 172   pub max_depth: Option<i32>,
 173 }
 174
 175 impl<'a> CommentQuery<'a> {
 176   pub async fn list(self, pool: &mut DbPool<'_>) -> Result<Vec<CommentView>, Error> {
 177     let conn = &mut get_conn(pool).await?;
 178
 179     // The left join below will return None in this case
 180     let person_id_join = self.local_user.map(|l| l.person_id).unwrap_or(PersonId(-1));
 181     let local_user_id_join = self.local_user.map(|l| l.id).unwrap_or(LocalUserId(-1));
 182
 183     let mut query = comment::table
 184       .inner_join(person::table)
 185       .inner_join(post::table)
 186       .inner_join(community::table.on(post::community_id.eq(community::id)))
 187       .inner_join(comment_aggregates::table)
 188       .left_join(
 189         community_person_ban::table.on(
 190           community::id
 191             .eq(community_person_ban::community_id)
 192             .and(community_person_ban::person_id.eq(comment::creator_id)),
 193         ),
 194       )
 195       .left_join(
 196         community_follower::table.on(
 197           post::community_id
 198             .eq(community_follower::community_id)
 199             .and(community_follower::person_id.eq(person_id_join)),
 200         ),
 201       )
 202       .left_join(
 203         comment_saved::table.on(
 204           comment::id
 205             .eq(comment_saved::comment_id)
 206             .and(comment_saved::person_id.eq(person_id_join)),
 207         ),
 208       )
 209       .left_join(
 210         person_block::table.on(
 211           comment::creator_id
 212             .eq(person_block::target_id)
 213             .and(person_block::person_id.eq(person_id_join)),
 214         ),
 215       )
 216       .left_join(
 217         community_block::table.on(
 218           community::id
 219             .eq(community_block::community_id)
 220             .and(community_block::person_id.eq(person_id_join)),
 221         ),
 222       )
 223       .left_join(
 224         comment_like::table.on(
 225           comment::id
 226             .eq(comment_like::comment_id)
 227             .and(comment_like::person_id.eq(person_id_join)),
 228         ),
 229       )
 230       .left_join(
 231         local_user_language::table.on(
 232           comment::language_id
 233             .eq(local_user_language::language_id)
 234             .and(local_user_language::local_user_id.eq(local_user_id_join)),
 235         ),
 236       )
 237       .select((
 238         comment::all_columns,
 239         person::all_columns,
 240         post::all_columns,
 241         community::all_columns,
 242         comment_aggregates::all_columns,
 243         community_person_ban::all_columns.nullable(),
 244         community_follower::all_columns.nullable(),
 245         comment_saved::all_columns.nullable(),
 246         person_block::all_columns.nullable(),
 247         comment_like::score.nullable(),
 248       ))
 249       .into_boxed();
 250
 251     if let Some(creator_id) = self.creator_id {
 252       query = query.filter(comment::creator_id.eq(creator_id));
 253     };
 254
 255     if let Some(post_id) = self.post_id {
 256       query = query.filter(comment::post_id.eq(post_id));
 257     };
 258
 259     if let Some(parent_path) = self.parent_path.as_ref() {
 260       query = query.filter(comment::path.contained_by(parent_path));
 261     };
 262
 263     if let Some(search_term) = self.search_term {
 264       query = query.filter(comment::content.ilike(fuzzy_search(&search_term)));
 265     };
 266
 267     if let Some(community_id) = self.community_id {
 268       query = query.filter(post::community_id.eq(community_id));
 269     }
 270
 271     if let Some(listing_type) = self.listing_type {
 272       match listing_type {
 273         ListingType::Subscribed => {
 274           query = query.filter(community_follower::person_id.is_not_null())
 275         } // TODO could be this: and(community_follower::person_id.eq(person_id_join)),
 276         ListingType::Local => {
 277           query = query.filter(community::local.eq(true)).filter(
 278             community::hidden
 279               .eq(false)
 280               .or(community_follower::person_id.eq(person_id_join)),
 281           )
 282         }
 283         ListingType::All => {
 284           query = query.filter(
 285             community::hidden
 286               .eq(false)
 287               .or(community_follower::person_id.eq(person_id_join)),
 288           )
 289         }
 290       }
 291     }
 292
 293     if self.saved_only.unwrap_or(false) {
 294       query = query.filter(comment_saved::comment_id.is_not_null());
 295     }
 296
 297     if !self.show_deleted_and_removed.unwrap_or(true) {
 298       query = query.filter(comment::deleted.eq(false));
 299       query = query.filter(comment::removed.eq(false));
 300     }
 301
 302     if !self.local_user.map(|l| l.show_bot_accounts).unwrap_or(true) {
 303       query = query.filter(person::bot_account.eq(false));
 304     };
 305
 306     if self.local_user.is_some() {
 307       // Filter out the rows with missing languages
 308       query = query.filter(local_user_language::language_id.is_not_null());
 309
 310       // Don't show blocked communities or persons
 311       if self.post_id.is_none() {
 312         query = query.filter(community_block::person_id.is_null());
 313       }
 314       query = query.filter(person_block::person_id.is_null());
 315     }
 316
 317     // A Max depth given means its a tree fetch
 318     let (limit, offset) = if let Some(max_depth) = self.max_depth {
 319       let depth_limit = if let Some(parent_path) = self.parent_path.as_ref() {
 320         parent_path.0.split('.').count() as i32 + max_depth
 321         // Add one because of root "0"
 322       } else {
 323         max_depth + 1
 324       };
 325
 326       query = query.filter(nlevel(comment::path).le(depth_limit));
 327
 328       // Always order by the parent path first
 329       query = query.order_by(subpath(comment::path, 0, -1));
 330
 331       // TODO limit question. Limiting does not work for comment threads ATM, only max_depth
 332       // For now, don't do any limiting for tree fetches
 333       // https://stackoverflow.com/questions/72983614/postgres-ltree-how-to-limit-the-max-number-of-children-at-any-given-level
 334
 335       // Don't use the regular error-checking one, many more comments must ofter be fetched.
 336       // This does not work for comment trees, and the limit should be manually set to a high number
 337       //
 338       // If a max depth is given, then you know its a tree fetch, and limits should be ignored
 339       // TODO a kludge to prevent attacks. Limit comments to 300 for now.
 340       // (i64::MAX, 0)
 341       (300, 0)
 342     } else {
 343       // limit_and_offset_unlimited(self.page, self.limit)
 344       limit_and_offset(self.page, self.limit)?
 345     };
 346
 347     query = match self.sort.unwrap_or(CommentSortType::Hot) {
 348       CommentSortType::Hot => query.then_order_by(comment_aggregates::hot_rank.desc()),
 349       CommentSortType::New => query.then_order_by(comment::published.desc()),
 350       CommentSortType::Old => query.then_order_by(comment::published.asc()),
 351       CommentSortType::Top => query.order_by(comment_aggregates::score.desc()),
 352     };
 353
 354     // Note: deleted and removed comments are done on the front side
 355     let res = query
 356       .limit(limit)
 357       .offset(offset)
 358       .load::<CommentViewTuple>(conn)
 359       .await?;
 360
 361     Ok(res.into_iter().map(CommentView::from_tuple).collect())
 362   }
 363 }
 364
 365 impl JoinView for CommentView {
 366   type JoinTuple = CommentViewTuple;
 367   fn from_tuple(a: Self::JoinTuple) -> Self {
 368     Self {
 369       comment: a.0,
 370       creator: a.1,
 371       post: a.2,
 372       community: a.3,
 373       counts: a.4,
 374       creator_banned_from_community: a.5.is_some(),
 375       subscribed: CommunityFollower::to_subscribed_type(&a.6),
 376       saved: a.7.is_some(),
 377       creator_blocked: a.8.is_some(),
 378       my_vote: a.9,
 379     }
 380   }
 381 }
 382
 383 #[cfg(test)]
 384 mod tests {
 385   use crate::comment_view::{
 386     Comment,
 387     CommentQuery,
 388     CommentSortType,
 389     CommentView,
 390     Community,
 391     DbPool,
 392     LocalUser,
 393     Person,
 394     PersonBlock,
 395     Post,
 396   };
 397   use lemmy_db_schema::{
 398     aggregates::structs::CommentAggregates,
 399     impls::actor_language::UNDETERMINED_ID,
 400     newtypes::LanguageId,
 401     source::{
 402       actor_language::LocalUserLanguage,
 403       comment::{CommentInsertForm, CommentLike, CommentLikeForm},
 404       community::CommunityInsertForm,
 405       instance::Instance,
 406       language::Language,
 407       local_user::LocalUserInsertForm,
 408       person::PersonInsertForm,
 409       person_block::PersonBlockForm,
 410       post::PostInsertForm,
 411     },
 412     traits::{Blockable, Crud, Likeable},
 413     utils::build_db_pool_for_tests,
 414     SubscribedType,
 415   };
 416   use serial_test::serial;
 417
 418   struct Data {
 419     inserted_instance: Instance,
 420     inserted_comment_0: Comment,
 421     inserted_comment_1: Comment,
 422     inserted_comment_2: Comment,
 423     inserted_post: Post,
 424     inserted_person: Person,
 425     inserted_local_user: LocalUser,
 426     inserted_person_2: Person,
 427     inserted_community: Community,
 428   }
 429
 430   async fn init_data(pool: &mut DbPool<'_>) -> Data {
 431     let inserted_instance = Instance::read_or_create(pool, "my_domain.tld".to_string())
 432       .await
 433       .unwrap();
 434
 435     let new_person = PersonInsertForm::builder()
 436       .name("timmy".into())
 437       .public_key("pubkey".to_string())
 438       .instance_id(inserted_instance.id)
 439       .build();
 440     let inserted_person = Person::create(pool, &new_person).await.unwrap();
 441     let local_user_form = LocalUserInsertForm::builder()
 442       .person_id(inserted_person.id)
 443       .password_encrypted(String::new())
 444       .build();
 445     let inserted_local_user = LocalUser::create(pool, &local_user_form).await.unwrap();
 446
 447     let new_person_2 = PersonInsertForm::builder()
 448       .name("sara".into())
 449       .public_key("pubkey".to_string())
 450       .instance_id(inserted_instance.id)
 451       .build();
 452     let inserted_person_2 = Person::create(pool, &new_person_2).await.unwrap();
 453
 454     let new_community = CommunityInsertForm::builder()
 455       .name("test community 5".to_string())
 456       .title("nada".to_owned())
 457       .public_key("pubkey".to_string())
 458       .instance_id(inserted_instance.id)
 459       .build();
 460
 461     let inserted_community = Community::create(pool, &new_community).await.unwrap();
 462
 463     let new_post = PostInsertForm::builder()
 464       .name("A test post 2".into())
 465       .creator_id(inserted_person.id)
 466       .community_id(inserted_community.id)
 467       .build();
 468
 469     let inserted_post = Post::create(pool, &new_post).await.unwrap();
 470     let english_id = Language::read_id_from_code(pool, Some("en")).await.unwrap();
 471
 472     // Create a comment tree with this hierarchy
 473     //       0
 474     //     \     \
 475     //    1      2
 476     //    \
 477     //  3  4
 478     //     \
 479     //     5
 480     let comment_form_0 = CommentInsertForm::builder()
 481       .content("Comment 0".into())
 482       .creator_id(inserted_person.id)
 483       .post_id(inserted_post.id)
 484       .language_id(english_id)
 485       .build();
 486
 487     let inserted_comment_0 = Comment::create(pool, &comment_form_0, None).await.unwrap();
 488
 489     let comment_form_1 = CommentInsertForm::builder()
 490       .content("Comment 1, A test blocked comment".into())
 491       .creator_id(inserted_person_2.id)
 492       .post_id(inserted_post.id)
 493       .language_id(english_id)
 494       .build();
 495
 496     let inserted_comment_1 = Comment::create(pool, &comment_form_1, Some(&inserted_comment_0.path))
 497       .await
 498       .unwrap();
 499
 500     let finnish_id = Language::read_id_from_code(pool, Some("fi")).await.unwrap();
 501     let comment_form_2 = CommentInsertForm::builder()
 502       .content("Comment 2".into())
 503       .creator_id(inserted_person.id)
 504       .post_id(inserted_post.id)
 505       .language_id(finnish_id)
 506       .build();
 507
 508     let inserted_comment_2 = Comment::create(pool, &comment_form_2, Some(&inserted_comment_0.path))
 509       .await
 510       .unwrap();
 511
 512     let comment_form_3 = CommentInsertForm::builder()
 513       .content("Comment 3".into())
 514       .creator_id(inserted_person.id)
 515       .post_id(inserted_post.id)
 516       .language_id(english_id)
 517       .build();
 518
 519     let _inserted_comment_3 =
 520       Comment::create(pool, &comment_form_3, Some(&inserted_comment_1.path))
 521         .await
 522         .unwrap();
 523
 524     let polish_id = Language::read_id_from_code(pool, Some("pl"))
 525       .await
 526       .unwrap()
 527       .unwrap();
 528     let comment_form_4 = CommentInsertForm::builder()
 529       .content("Comment 4".into())
 530       .creator_id(inserted_person.id)
 531       .post_id(inserted_post.id)
 532       .language_id(Some(polish_id))
 533       .build();
 534
 535     let inserted_comment_4 = Comment::create(pool, &comment_form_4, Some(&inserted_comment_1.path))
 536       .await
 537       .unwrap();
 538
 539     let comment_form_5 = CommentInsertForm::builder()
 540       .content("Comment 5".into())
 541       .creator_id(inserted_person.id)
 542       .post_id(inserted_post.id)
 543       .build();
 544
 545     let _inserted_comment_5 =
 546       Comment::create(pool, &comment_form_5, Some(&inserted_comment_4.path))
 547         .await
 548         .unwrap();
 549
 550     let timmy_blocks_sara_form = PersonBlockForm {
 551       person_id: inserted_person.id,
 552       target_id: inserted_person_2.id,
 553     };
 554
 555     let inserted_block = PersonBlock::block(pool, &timmy_blocks_sara_form)
 556       .await
 557       .unwrap();
 558
 559     let expected_block = PersonBlock {
 560       id: inserted_block.id,
 561       person_id: inserted_person.id,
 562       target_id: inserted_person_2.id,
 563       published: inserted_block.published,
 564     };
 565     assert_eq!(expected_block, inserted_block);
 566
 567     let comment_like_form = CommentLikeForm {
 568       comment_id: inserted_comment_0.id,
 569       post_id: inserted_post.id,
 570       person_id: inserted_person.id,
 571       score: 1,
 572     };
 573
 574     let _inserted_comment_like = CommentLike::like(pool, &comment_like_form).await.unwrap();
 575
 576     Data {
 577       inserted_instance,
 578       inserted_comment_0,
 579       inserted_comment_1,
 580       inserted_comment_2,
 581       inserted_post,
 582       inserted_person,
 583       inserted_local_user,
 584       inserted_person_2,
 585       inserted_community,
 586     }
 587   }
 588
 589   #[tokio::test]
 590   #[serial]
 591   async fn test_crud() {
 592     let pool = &build_db_pool_for_tests().await;
 593     let pool = &mut pool.into();
 594     let data = init_data(pool).await;
 595
 596     let expected_comment_view_no_person = expected_comment_view(&data, pool).await;
 597
 598     let mut expected_comment_view_with_person = expected_comment_view_no_person.clone();
 599     expected_comment_view_with_person.my_vote = Some(1);
 600
 601     let read_comment_views_no_person = CommentQuery {
 602       sort: (Some(CommentSortType::Old)),
 603       post_id: (Some(data.inserted_post.id)),
 604       ..Default::default()
 605     }
 606     .list(pool)
 607     .await
 608     .unwrap();
 609
 610     assert_eq!(
 611       expected_comment_view_no_person,
 612       read_comment_views_no_person[0]
 613     );
 614
 615     let read_comment_views_with_person = CommentQuery {
 616       sort: (Some(CommentSortType::Old)),
 617       post_id: (Some(data.inserted_post.id)),
 618       local_user: (Some(&data.inserted_local_user)),
 619       ..Default::default()
 620     }
 621     .list(pool)
 622     .await
 623     .unwrap();
 624
 625     assert_eq!(
 626       expected_comment_view_with_person,
 627       read_comment_views_with_person[0]
 628     );
 629
 630     // Make sure its 1, not showing the blocked comment
 631     assert_eq!(5, read_comment_views_with_person.len());
 632
 633     let read_comment_from_blocked_person = CommentView::read(
 634       pool,
 635       data.inserted_comment_1.id,
 636       Some(data.inserted_person.id),
 637     )
 638     .await
 639     .unwrap();
 640
 641     // Make sure block set the creator blocked
 642     assert!(read_comment_from_blocked_person.creator_blocked);
 643
 644     cleanup(data, pool).await;
 645   }
 646
 647   #[tokio::test]
 648   #[serial]
 649   async fn test_comment_tree() {
 650     let pool = &build_db_pool_for_tests().await;
 651     let pool = &mut pool.into();
 652     let data = init_data(pool).await;
 653
 654     let top_path = data.inserted_comment_0.path.clone();
 655     let read_comment_views_top_path = CommentQuery {
 656       post_id: (Some(data.inserted_post.id)),
 657       parent_path: (Some(top_path)),
 658       ..Default::default()
 659     }
 660     .list(pool)
 661     .await
 662     .unwrap();
 663
 664     let child_path = data.inserted_comment_1.path.clone();
 665     let read_comment_views_child_path = CommentQuery {
 666       post_id: (Some(data.inserted_post.id)),
 667       parent_path: (Some(child_path)),
 668       ..Default::default()
 669     }
 670     .list(pool)
 671     .await
 672     .unwrap();
 673
 674     // Make sure the comment parent-limited fetch is correct
 675     assert_eq!(6, read_comment_views_top_path.len());
 676     assert_eq!(4, read_comment_views_child_path.len());
 677
 678     // Make sure it contains the parent, but not the comment from the other tree
 679     let child_comments = read_comment_views_child_path
 680       .into_iter()
 681       .map(|c| c.comment)
 682       .collect::<Vec<Comment>>();
 683     assert!(child_comments.contains(&data.inserted_comment_1));
 684     assert!(!child_comments.contains(&data.inserted_comment_2));
 685
 686     let read_comment_views_top_max_depth = CommentQuery {
 687       post_id: (Some(data.inserted_post.id)),
 688       max_depth: (Some(1)),
 689       ..Default::default()
 690     }
 691     .list(pool)
 692     .await
 693     .unwrap();
 694
 695     // Make sure a depth limited one only has the top comment
 696     assert_eq!(
 697       expected_comment_view(&data, pool).await,
 698       read_comment_views_top_max_depth[0]
 699     );
 700     assert_eq!(1, read_comment_views_top_max_depth.len());
 701
 702     let child_path = data.inserted_comment_1.path.clone();
 703     let read_comment_views_parent_max_depth = CommentQuery {
 704       post_id: (Some(data.inserted_post.id)),
 705       parent_path: (Some(child_path)),
 706       max_depth: (Some(1)),
 707       sort: (Some(CommentSortType::New)),
 708       ..Default::default()
 709     }
 710     .list(pool)
 711     .await
 712     .unwrap();
 713
 714     // Make sure a depth limited one, and given child comment 1, has 3
 715     assert!(read_comment_views_parent_max_depth[2]
 716       .comment
 717       .content
 718       .eq("Comment 3"));
 719     assert_eq!(3, read_comment_views_parent_max_depth.len());
 720
 721     cleanup(data, pool).await;
 722   }
 723
 724   #[tokio::test]
 725   #[serial]
 726   async fn test_languages() {
 727     let pool = &build_db_pool_for_tests().await;
 728     let pool = &mut pool.into();
 729     let data = init_data(pool).await;
 730
 731     // by default, user has all languages enabled and should see all comments
 732     // (except from blocked user)
 733     let all_languages = CommentQuery {
 734       local_user: (Some(&data.inserted_local_user)),
 735       ..Default::default()
 736     }
 737     .list(pool)
 738     .await
 739     .unwrap();
 740     assert_eq!(5, all_languages.len());
 741
 742     // change user lang to finnish, should only show one post in finnish and one undetermined
 743     let finnish_id = Language::read_id_from_code(pool, Some("fi"))
 744       .await
 745       .unwrap()
 746       .unwrap();
 747     LocalUserLanguage::update(pool, vec![finnish_id], data.inserted_local_user.id)
 748       .await
 749       .unwrap();
 750     let finnish_comments = CommentQuery {
 751       local_user: (Some(&data.inserted_local_user)),
 752       ..Default::default()
 753     }
 754     .list(pool)
 755     .await
 756     .unwrap();
 757     assert_eq!(2, finnish_comments.len());
 758     let finnish_comment = finnish_comments
 759       .iter()
 760       .find(|c| c.comment.language_id == finnish_id);
 761     assert!(finnish_comment.is_some());
 762     assert_eq!(
 763       data.inserted_comment_2.content,
 764       finnish_comment.unwrap().comment.content
 765     );
 766
 767     // now show all comments with undetermined language (which is the default value)
 768     LocalUserLanguage::update(pool, vec![UNDETERMINED_ID], data.inserted_local_user.id)
 769       .await
 770       .unwrap();
 771     let undetermined_comment = CommentQuery {
 772       local_user: (Some(&data.inserted_local_user)),
 773       ..Default::default()
 774     }
 775     .list(pool)
 776     .await
 777     .unwrap();
 778     assert_eq!(1, undetermined_comment.len());
 779
 780     cleanup(data, pool).await;
 781   }
 782
 783   async fn cleanup(data: Data, pool: &mut DbPool<'_>) {
 784     CommentLike::remove(pool, data.inserted_person.id, data.inserted_comment_0.id)
 785       .await
 786       .unwrap();
 787     Comment::delete(pool, data.inserted_comment_0.id)
 788       .await
 789       .unwrap();
 790     Comment::delete(pool, data.inserted_comment_1.id)
 791       .await
 792       .unwrap();
 793     Post::delete(pool, data.inserted_post.id).await.unwrap();
 794     Community::delete(pool, data.inserted_community.id)
 795       .await
 796       .unwrap();
 797     Person::delete(pool, data.inserted_person.id).await.unwrap();
 798     Person::delete(pool, data.inserted_person_2.id)
 799       .await
 800       .unwrap();
 801     Instance::delete(pool, data.inserted_instance.id)
 802       .await
 803       .unwrap();
 804   }
 805
 806   async fn expected_comment_view(data: &Data, pool: &mut DbPool<'_>) -> CommentView {
 807     let agg = CommentAggregates::read(pool, data.inserted_comment_0.id)
 808       .await
 809       .unwrap();
 810     CommentView {
 811       creator_banned_from_community: false,
 812       my_vote: None,
 813       subscribed: SubscribedType::NotSubscribed,
 814       saved: false,
 815       creator_blocked: false,
 816       comment: Comment {
 817         id: data.inserted_comment_0.id,
 818         content: "Comment 0".into(),
 819         creator_id: data.inserted_person.id,
 820         post_id: data.inserted_post.id,
 821         removed: false,
 822         deleted: false,
 823         published: data.inserted_comment_0.published,
 824         ap_id: data.inserted_comment_0.ap_id.clone(),
 825         updated: None,
 826         local: true,
 827         distinguished: false,
 828         path: data.inserted_comment_0.clone().path,
 829         language_id: LanguageId(37),
 830       },
 831       creator: Person {
 832         id: data.inserted_person.id,
 833         name: "timmy".into(),
 834         display_name: None,
 835         published: data.inserted_person.published,
 836         avatar: None,
 837         actor_id: data.inserted_person.actor_id.clone(),
 838         local: true,
 839         banned: false,
 840         deleted: false,
 841         admin: false,
 842         bot_account: false,
 843         bio: None,
 844         banner: None,
 845         updated: None,
 846         inbox_url: data.inserted_person.inbox_url.clone(),
 847         shared_inbox_url: None,
 848         matrix_user_id: None,
 849         ban_expires: None,
 850         instance_id: data.inserted_instance.id,
 851         private_key: data.inserted_person.private_key.clone(),
 852         public_key: data.inserted_person.public_key.clone(),
 853         last_refreshed_at: data.inserted_person.last_refreshed_at,
 854       },
 855       post: Post {
 856         id: data.inserted_post.id,
 857         name: data.inserted_post.name.clone(),
 858         creator_id: data.inserted_person.id,
 859         url: None,
 860         body: None,
 861         published: data.inserted_post.published,
 862         updated: None,
 863         community_id: data.inserted_community.id,
 864         removed: false,
 865         deleted: false,
 866         locked: false,
 867         nsfw: false,
 868         embed_title: None,
 869         embed_description: None,
 870         embed_video_url: None,
 871         thumbnail_url: None,
 872         ap_id: data.inserted_post.ap_id.clone(),
 873         local: true,
 874         language_id: Default::default(),
 875         featured_community: false,
 876         featured_local: false,
 877       },
 878       community: Community {
 879         id: data.inserted_community.id,
 880         name: "test community 5".to_string(),
 881         icon: None,
 882         removed: false,
 883         deleted: false,
 884         nsfw: false,
 885         actor_id: data.inserted_community.actor_id.clone(),
 886         local: true,
 887         title: "nada".to_owned(),
 888         description: None,
 889         updated: None,
 890         banner: None,
 891         hidden: false,
 892         posting_restricted_to_mods: false,
 893         published: data.inserted_community.published,
 894         instance_id: data.inserted_instance.id,
 895         private_key: data.inserted_community.private_key.clone(),
 896         public_key: data.inserted_community.public_key.clone(),
 897         last_refreshed_at: data.inserted_community.last_refreshed_at,
 898         followers_url: data.inserted_community.followers_url.clone(),
 899         inbox_url: data.inserted_community.inbox_url.clone(),
 900         shared_inbox_url: data.inserted_community.shared_inbox_url.clone(),
 901         moderators_url: data.inserted_community.moderators_url.clone(),
 902         featured_url: data.inserted_community.featured_url.clone(),
 903       },
 904       counts: CommentAggregates {
 905         id: agg.id,
 906         comment_id: data.inserted_comment_0.id,
 907         score: 1,
 908         upvotes: 1,
 909         downvotes: 0,
 910         published: agg.published,
 911         child_count: 5,
 912         hot_rank: 1728,
 913       },
 914     }
 915   }
 916 }