crates/db_views/src/comment_view.rs

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