lemmy/crates/db_views/src/comment_view.rs

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use crate::structs::CommentView;
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use diesel::{
result::Error,
BoolExpressionMethods,
ExpressionMethods,
JoinOnDsl,
NullableExpressionMethods,
PgTextExpressionMethods,
QueryDsl,
};
use diesel_async::RunQueryDsl;
use diesel_ltree::{nlevel, subpath, Ltree, LtreeExtensions};
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use lemmy_db_schema::{
aggregates::structs::CommentAggregates,
newtypes::{CommentId, CommunityId, LocalUserId, PersonId, PostId},
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schema::{
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comment,
comment_aggregates,
comment_like,
comment_saved,
community,
community_block,
community_follower,
community_person_ban,
local_user_language,
person,
person_block,
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post,
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},
source::{
comment::{Comment, CommentSaved},
community::{Community, CommunityFollower, CommunityPersonBan},
local_user::LocalUser,
person::Person,
person_block::PersonBlock,
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post::Post,
},
traits::JoinView,
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utils::{functions::hot_rank, fuzzy_search, get_conn, limit_and_offset_unlimited, DbPool},
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CommentSortType,
ListingType,
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};
use typed_builder::TypedBuilder;
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type CommentViewTuple = (
Comment,
Person,
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Post,
Community,
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CommentAggregates,
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Option<CommunityPersonBan>,
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Option<CommunityFollower>,
Option<CommentSaved>,
Option<PersonBlock>,
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Option<i16>,
);
impl CommentView {
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pub async fn read(
pool: &DbPool,
comment_id: CommentId,
my_person_id: Option<PersonId>,
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) -> Result<Self, Error> {
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let conn = &mut get_conn(pool).await?;
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// The left join below will return None in this case
let person_id_join = my_person_id.unwrap_or(PersonId(-1));
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let (
comment,
creator,
post,
community,
counts,
creator_banned_from_community,
follower,
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saved,
creator_blocked,
comment_like,
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) = comment::table
.find(comment_id)
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.inner_join(person::table)
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.inner_join(post::table)
.inner_join(community::table.on(post::community_id.eq(community::id)))
.inner_join(comment_aggregates::table)
.left_join(
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community_person_ban::table.on(
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community::id
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.eq(community_person_ban::community_id)
.and(community_person_ban::person_id.eq(comment::creator_id)),
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),
)
.left_join(
community_follower::table.on(
post::community_id
.eq(community_follower::community_id)
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.and(community_follower::person_id.eq(person_id_join)),
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),
)
.left_join(
comment_saved::table.on(
comment::id
.eq(comment_saved::comment_id)
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.and(comment_saved::person_id.eq(person_id_join)),
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),
)
.left_join(
person_block::table.on(
comment::creator_id
.eq(person_block::target_id)
.and(person_block::person_id.eq(person_id_join)),
),
)
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.left_join(
comment_like::table.on(
comment::id
.eq(comment_like::comment_id)
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.and(comment_like::person_id.eq(person_id_join)),
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),
)
.select((
comment::all_columns,
person::all_columns,
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post::all_columns,
community::all_columns,
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comment_aggregates::all_columns,
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community_person_ban::all_columns.nullable(),
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community_follower::all_columns.nullable(),
comment_saved::all_columns.nullable(),
person_block::all_columns.nullable(),
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comment_like::score.nullable(),
))
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.first::<CommentViewTuple>(conn)
.await?;
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// If a person is given, then my_vote, if None, should be 0, not null
// Necessary to differentiate between other person's votes
let my_vote = if my_person_id.is_some() && comment_like.is_none() {
Some(0)
} else {
comment_like
};
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Ok(CommentView {
comment,
post,
creator,
community,
counts,
creator_banned_from_community: creator_banned_from_community.is_some(),
subscribed: CommunityFollower::to_subscribed_type(&follower),
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saved: saved.is_some(),
creator_blocked: creator_blocked.is_some(),
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my_vote,
})
}
}
#[derive(TypedBuilder)]
#[builder(field_defaults(default))]
pub struct CommentQuery<'a> {
#[builder(!default)]
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pool: &'a DbPool,
listing_type: Option<ListingType>,
sort: Option<CommentSortType>,
community_id: Option<CommunityId>,
post_id: Option<PostId>,
parent_path: Option<Ltree>,
creator_id: Option<PersonId>,
local_user: Option<&'a LocalUser>,
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search_term: Option<String>,
saved_only: Option<bool>,
show_deleted_and_removed: Option<bool>,
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page: Option<i64>,
limit: Option<i64>,
max_depth: Option<i32>,
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}
impl<'a> CommentQuery<'a> {
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pub async fn list(self) -> Result<Vec<CommentView>, Error> {
let conn = &mut get_conn(self.pool).await?;
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// The left join below will return None in this case
let person_id_join = self.local_user.map(|l| l.person_id).unwrap_or(PersonId(-1));
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let local_user_id_join = self.local_user.map(|l| l.id).unwrap_or(LocalUserId(-1));
let mut query = comment::table
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.inner_join(person::table)
.inner_join(post::table)
.inner_join(community::table.on(post::community_id.eq(community::id)))
.inner_join(comment_aggregates::table)
.left_join(
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community_person_ban::table.on(
community::id
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.eq(community_person_ban::community_id)
.and(community_person_ban::person_id.eq(comment::creator_id)),
),
)
.left_join(
community_follower::table.on(
post::community_id
.eq(community_follower::community_id)
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.and(community_follower::person_id.eq(person_id_join)),
),
)
.left_join(
comment_saved::table.on(
comment::id
.eq(comment_saved::comment_id)
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.and(comment_saved::person_id.eq(person_id_join)),
),
)
.left_join(
person_block::table.on(
comment::creator_id
.eq(person_block::target_id)
.and(person_block::person_id.eq(person_id_join)),
),
)
.left_join(
community_block::table.on(
community::id
.eq(community_block::community_id)
.and(community_block::person_id.eq(person_id_join)),
),
)
.left_join(
comment_like::table.on(
comment::id
.eq(comment_like::comment_id)
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.and(comment_like::person_id.eq(person_id_join)),
),
)
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.left_join(
local_user_language::table.on(
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comment::language_id
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.eq(local_user_language::language_id)
.and(local_user_language::local_user_id.eq(local_user_id_join)),
),
)
.select((
comment::all_columns,
person::all_columns,
post::all_columns,
community::all_columns,
comment_aggregates::all_columns,
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community_person_ban::all_columns.nullable(),
community_follower::all_columns.nullable(),
comment_saved::all_columns.nullable(),
person_block::all_columns.nullable(),
comment_like::score.nullable(),
))
.into_boxed();
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if let Some(creator_id) = self.creator_id {
query = query.filter(comment::creator_id.eq(creator_id));
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};
if let Some(post_id) = self.post_id {
query = query.filter(comment::post_id.eq(post_id));
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};
if let Some(parent_path) = self.parent_path.as_ref() {
query = query.filter(comment::path.contained_by(parent_path));
};
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if let Some(search_term) = self.search_term {
query = query.filter(comment::content.ilike(fuzzy_search(&search_term)));
};
if let Some(community_id) = self.community_id {
query = query.filter(post::community_id.eq(community_id));
}
if let Some(listing_type) = self.listing_type {
match listing_type {
ListingType::Subscribed => {
query = query.filter(community_follower::person_id.is_not_null())
} // TODO could be this: and(community_follower::person_id.eq(person_id_join)),
ListingType::Local => {
query = query.filter(community::local.eq(true)).filter(
community::hidden
.eq(false)
.or(community_follower::person_id.eq(person_id_join)),
)
}
ListingType::All => {
query = query.filter(
community::hidden
.eq(false)
.or(community_follower::person_id.eq(person_id_join)),
)
}
}
}
if self.saved_only.unwrap_or(false) {
query = query.filter(comment_saved::comment_id.is_not_null());
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}
if !self.show_deleted_and_removed.unwrap_or(true) {
query = query.filter(comment::deleted.eq(false));
query = query.filter(comment::removed.eq(false));
}
if !self.local_user.map(|l| l.show_bot_accounts).unwrap_or(true) {
query = query.filter(person::bot_account.eq(false));
};
if self.local_user.is_some() {
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// Filter out the rows with missing languages
query = query.filter(local_user_language::language_id.is_not_null());
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// Don't show blocked communities or persons
if self.post_id.is_none() {
query = query.filter(community_block::person_id.is_null());
}
query = query.filter(person_block::person_id.is_null());
}
// A Max depth given means its a tree fetch
let (limit, offset) = if let Some(max_depth) = self.max_depth {
let depth_limit = if let Some(parent_path) = self.parent_path.as_ref() {
parent_path.0.split('.').count() as i32 + max_depth
// Add one because of root "0"
} else {
max_depth + 1
};
query = query.filter(nlevel(comment::path).le(depth_limit));
// Always order by the parent path first
query = query.order_by(subpath(comment::path, 0, -1));
// TODO limit question. Limiting does not work for comment threads ATM, only max_depth
// For now, don't do any limiting for tree fetches
// https://stackoverflow.com/questions/72983614/postgres-ltree-how-to-limit-the-max-number-of-children-at-any-given-level
// Don't use the regular error-checking one, many more comments must ofter be fetched.
// This does not work for comment trees, and the limit should be manually set to a high number
//
// If a max depth is given, then you know its a tree fetch, and limits should be ignored
(i64::MAX, 0)
} else {
limit_and_offset_unlimited(self.page, self.limit)
};
query = match self.sort.unwrap_or(CommentSortType::Hot) {
CommentSortType::Hot => query
.then_order_by(hot_rank(comment_aggregates::score, comment_aggregates::published).desc())
.then_order_by(comment_aggregates::published.desc()),
CommentSortType::New => query.then_order_by(comment::published.desc()),
CommentSortType::Old => query.then_order_by(comment::published.asc()),
CommentSortType::Top => query.order_by(comment_aggregates::score.desc()),
};
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// Note: deleted and removed comments are done on the front side
let res = query
.limit(limit)
.offset(offset)
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.load::<CommentViewTuple>(conn)
.await?;
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Ok(res.into_iter().map(CommentView::from_tuple).collect())
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}
}
impl JoinView for CommentView {
type JoinTuple = CommentViewTuple;
fn from_tuple(a: Self::JoinTuple) -> Self {
Self {
comment: a.0,
creator: a.1,
post: a.2,
community: a.3,
counts: a.4,
creator_banned_from_community: a.5.is_some(),
subscribed: CommunityFollower::to_subscribed_type(&a.6),
saved: a.7.is_some(),
creator_blocked: a.8.is_some(),
my_vote: a.9,
}
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}
}
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#[cfg(test)]
mod tests {
use crate::comment_view::{
Comment,
CommentQuery,
CommentSortType,
CommentView,
Community,
DbPool,
LocalUser,
Person,
PersonBlock,
Post,
};
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use lemmy_db_schema::{
aggregates::structs::CommentAggregates,
impls::actor_language::UNDETERMINED_ID,
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newtypes::LanguageId,
source::{
actor_language::LocalUserLanguage,
comment::{CommentInsertForm, CommentLike, CommentLikeForm},
community::CommunityInsertForm,
instance::Instance,
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language::Language,
local_user::LocalUserInsertForm,
person::PersonInsertForm,
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person_block::PersonBlockForm,
post::PostInsertForm,
},
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traits::{Blockable, Crud, Likeable},
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utils::build_db_pool_for_tests,
SubscribedType,
};
use serial_test::serial;
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struct Data {
inserted_instance: Instance,
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inserted_comment_0: Comment,
inserted_comment_1: Comment,
inserted_comment_2: Comment,
inserted_post: Post,
inserted_person: Person,
inserted_local_user: LocalUser,
inserted_person_2: Person,
inserted_community: Community,
}
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async fn init_data(pool: &DbPool) -> Data {
let inserted_instance = Instance::read_or_create(pool, "my_domain.tld".to_string())
.await
.unwrap();
let new_person = PersonInsertForm::builder()
.name("timmy".into())
.public_key("pubkey".to_string())
.instance_id(inserted_instance.id)
.build();
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let inserted_person = Person::create(pool, &new_person).await.unwrap();
let local_user_form = LocalUserInsertForm::builder()
.person_id(inserted_person.id)
.password_encrypted(String::new())
.build();
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let inserted_local_user = LocalUser::create(pool, &local_user_form).await.unwrap();
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let new_person_2 = PersonInsertForm::builder()
.name("sara".into())
.public_key("pubkey".to_string())
.instance_id(inserted_instance.id)
.build();
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let inserted_person_2 = Person::create(pool, &new_person_2).await.unwrap();
let new_community = CommunityInsertForm::builder()
.name("test community 5".to_string())
.title("nada".to_owned())
.public_key("pubkey".to_string())
.instance_id(inserted_instance.id)
.build();
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let inserted_community = Community::create(pool, &new_community).await.unwrap();
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let new_post = PostInsertForm::builder()
.name("A test post 2".into())
.creator_id(inserted_person.id)
.community_id(inserted_community.id)
.build();
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let inserted_post = Post::create(pool, &new_post).await.unwrap();
let english_id = Language::read_id_from_code(pool, Some("en")).await.unwrap();
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// Create a comment tree with this hierarchy
// 0
// \ \
// 1 2
// \
// 3 4
// \
// 5
let comment_form_0 = CommentInsertForm::builder()
.content("Comment 0".into())
.creator_id(inserted_person.id)
.post_id(inserted_post.id)
.language_id(english_id)
.build();
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let inserted_comment_0 = Comment::create(pool, &comment_form_0, None).await.unwrap();
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let comment_form_1 = CommentInsertForm::builder()
.content("Comment 1, A test blocked comment".into())
.creator_id(inserted_person_2.id)
.post_id(inserted_post.id)
.language_id(english_id)
.build();
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let inserted_comment_1 = Comment::create(pool, &comment_form_1, Some(&inserted_comment_0.path))
.await
.unwrap();
let finnish_id = Language::read_id_from_code(pool, Some("fi")).await.unwrap();
let comment_form_2 = CommentInsertForm::builder()
.content("Comment 2".into())
.creator_id(inserted_person.id)
.post_id(inserted_post.id)
.language_id(finnish_id)
.build();
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let inserted_comment_2 = Comment::create(pool, &comment_form_2, Some(&inserted_comment_0.path))
.await
.unwrap();
let comment_form_3 = CommentInsertForm::builder()
.content("Comment 3".into())
.creator_id(inserted_person.id)
.post_id(inserted_post.id)
.language_id(english_id)
.build();
let _inserted_comment_3 =
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Comment::create(pool, &comment_form_3, Some(&inserted_comment_1.path))
.await
.unwrap();
let polish_id = Language::read_id_from_code(pool, Some("pl"))
.await
.unwrap()
.unwrap();
let comment_form_4 = CommentInsertForm::builder()
.content("Comment 4".into())
.creator_id(inserted_person.id)
.post_id(inserted_post.id)
.language_id(Some(polish_id))
.build();
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let inserted_comment_4 = Comment::create(pool, &comment_form_4, Some(&inserted_comment_1.path))
.await
.unwrap();
let comment_form_5 = CommentInsertForm::builder()
.content("Comment 5".into())
.creator_id(inserted_person.id)
.post_id(inserted_post.id)
.build();
let _inserted_comment_5 =
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Comment::create(pool, &comment_form_5, Some(&inserted_comment_4.path))
.await
.unwrap();
let timmy_blocks_sara_form = PersonBlockForm {
person_id: inserted_person.id,
target_id: inserted_person_2.id,
};
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let inserted_block = PersonBlock::block(pool, &timmy_blocks_sara_form)
.await
.unwrap();
let expected_block = PersonBlock {
id: inserted_block.id,
person_id: inserted_person.id,
target_id: inserted_person_2.id,
published: inserted_block.published,
};
assert_eq!(expected_block, inserted_block);
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let comment_like_form = CommentLikeForm {
comment_id: inserted_comment_0.id,
post_id: inserted_post.id,
person_id: inserted_person.id,
score: 1,
};
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let _inserted_comment_like = CommentLike::like(pool, &comment_like_form).await.unwrap();
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Data {
inserted_instance,
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inserted_comment_0,
inserted_comment_1,
inserted_comment_2,
inserted_post,
inserted_person,
inserted_local_user,
inserted_person_2,
inserted_community,
}
}
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#[tokio::test]
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#[serial]
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async fn test_crud() {
let pool = &build_db_pool_for_tests().await;
let data = init_data(pool).await;
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let expected_comment_view_no_person = expected_comment_view(&data, pool).await;
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let mut expected_comment_view_with_person = expected_comment_view_no_person.clone();
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expected_comment_view_with_person.my_vote = Some(1);
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let read_comment_views_no_person = CommentQuery::builder()
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.pool(pool)
.sort(Some(CommentSortType::Hot))
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.post_id(Some(data.inserted_post.id))
.build()
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.list()
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.await
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.unwrap();
assert_eq!(
expected_comment_view_no_person,
read_comment_views_no_person[0]
);
let read_comment_views_with_person = CommentQuery::builder()
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.pool(pool)
.sort(Some(CommentSortType::Hot))
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.post_id(Some(data.inserted_post.id))
.local_user(Some(&data.inserted_local_user))
.build()
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.list()
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.await
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.unwrap();
assert_eq!(
expected_comment_view_with_person,
read_comment_views_with_person[0]
);
// Make sure its 1, not showing the blocked comment
assert_eq!(5, read_comment_views_with_person.len());
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let read_comment_from_blocked_person = CommentView::read(
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pool,
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data.inserted_comment_1.id,
Some(data.inserted_person.id),
)
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.await
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.unwrap();
// Make sure block set the creator blocked
assert!(read_comment_from_blocked_person.creator_blocked);
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cleanup(data, pool).await;
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}
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#[tokio::test]
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#[serial]
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async fn test_comment_tree() {
let pool = &build_db_pool_for_tests().await;
let data = init_data(pool).await;
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let top_path = data.inserted_comment_0.path.clone();
let read_comment_views_top_path = CommentQuery::builder()
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.pool(pool)
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.post_id(Some(data.inserted_post.id))
.parent_path(Some(top_path))
.build()
.list()
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.await
.unwrap();
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let child_path = data.inserted_comment_1.path.clone();
let read_comment_views_child_path = CommentQuery::builder()
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.pool(pool)
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.post_id(Some(data.inserted_post.id))
.parent_path(Some(child_path))
.build()
.list()
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.await
.unwrap();
// Make sure the comment parent-limited fetch is correct
assert_eq!(6, read_comment_views_top_path.len());
assert_eq!(4, read_comment_views_child_path.len());
// Make sure it contains the parent, but not the comment from the other tree
let child_comments = read_comment_views_child_path
.into_iter()
.map(|c| c.comment)
.collect::<Vec<Comment>>();
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assert!(child_comments.contains(&data.inserted_comment_1));
assert!(!child_comments.contains(&data.inserted_comment_2));
let read_comment_views_top_max_depth = CommentQuery::builder()
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.pool(pool)
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.post_id(Some(data.inserted_post.id))
.max_depth(Some(1))
.build()
.list()
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.await
.unwrap();
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// Make sure a depth limited one only has the top comment
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assert_eq!(
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expected_comment_view(&data, pool).await,
read_comment_views_top_max_depth[0]
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);
assert_eq!(1, read_comment_views_top_max_depth.len());
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let child_path = data.inserted_comment_1.path.clone();
let read_comment_views_parent_max_depth = CommentQuery::builder()
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.pool(pool)
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.post_id(Some(data.inserted_post.id))
.parent_path(Some(child_path))
.max_depth(Some(1))
.sort(Some(CommentSortType::New))
.build()
.list()
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.await
.unwrap();
// Make sure a depth limited one, and given child comment 1, has 3
assert!(read_comment_views_parent_max_depth[2]
.comment
.content
.eq("Comment 3"));
assert_eq!(3, read_comment_views_parent_max_depth.len());
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cleanup(data, pool).await;
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}
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#[tokio::test]
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#[serial]
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async fn test_languages() {
let pool = &build_db_pool_for_tests().await;
let data = init_data(pool).await;
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// by default, user has all languages enabled and should see all comments
// (except from blocked user)
let all_languages = CommentQuery::builder()
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.pool(pool)
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.local_user(Some(&data.inserted_local_user))
.build()
.list()
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.await
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.unwrap();
assert_eq!(5, all_languages.len());
// change user lang to finnish, should only show one post in finnish and one undetermined
let finnish_id = Language::read_id_from_code(pool, Some("fi"))
.await
.unwrap()
.unwrap();
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LocalUserLanguage::update(pool, vec![finnish_id], data.inserted_local_user.id)
.await
.unwrap();
let finnish_comments = CommentQuery::builder()
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.pool(pool)
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.local_user(Some(&data.inserted_local_user))
.build()
.list()
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.await
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.unwrap();
assert_eq!(2, finnish_comments.len());
let finnish_comment = finnish_comments
.iter()
.find(|c| c.comment.language_id == finnish_id);
assert!(finnish_comment.is_some());
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assert_eq!(
data.inserted_comment_2.content,
finnish_comment.unwrap().comment.content
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);
// now show all comments with undetermined language (which is the default value)
LocalUserLanguage::update(pool, vec![UNDETERMINED_ID], data.inserted_local_user.id)
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.await
.unwrap();
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let undetermined_comment = CommentQuery::builder()
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.pool(pool)
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.local_user(Some(&data.inserted_local_user))
.build()
.list()
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.await
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.unwrap();
assert_eq!(1, undetermined_comment.len());
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cleanup(data, pool).await;
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}
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async fn cleanup(data: Data, pool: &DbPool) {
CommentLike::remove(pool, data.inserted_person.id, data.inserted_comment_0.id)
.await
.unwrap();
Comment::delete(pool, data.inserted_comment_0.id)
.await
.unwrap();
Comment::delete(pool, data.inserted_comment_1.id)
.await
.unwrap();
Post::delete(pool, data.inserted_post.id).await.unwrap();
Community::delete(pool, data.inserted_community.id)
.await
.unwrap();
Person::delete(pool, data.inserted_person.id).await.unwrap();
Person::delete(pool, data.inserted_person_2.id)
.await
.unwrap();
Instance::delete(pool, data.inserted_instance.id)
.await
.unwrap();
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}
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async fn expected_comment_view(data: &Data, pool: &DbPool) -> CommentView {
let agg = CommentAggregates::read(pool, data.inserted_comment_0.id)
.await
.unwrap();
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CommentView {
creator_banned_from_community: false,
my_vote: None,
subscribed: SubscribedType::NotSubscribed,
saved: false,
creator_blocked: false,
comment: Comment {
id: data.inserted_comment_0.id,
content: "Comment 0".into(),
creator_id: data.inserted_person.id,
post_id: data.inserted_post.id,
removed: false,
deleted: false,
published: data.inserted_comment_0.published,
ap_id: data.inserted_comment_0.ap_id.clone(),
updated: None,
local: true,
distinguished: false,
path: data.inserted_comment_0.clone().path,
language_id: LanguageId(37),
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},
creator: Person {
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id: data.inserted_person.id,
name: "timmy".into(),
display_name: None,
published: data.inserted_person.published,
avatar: None,
actor_id: data.inserted_person.actor_id.clone(),
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local: true,
banned: false,
deleted: false,
admin: false,
bot_account: false,
bio: None,
banner: None,
updated: None,
inbox_url: data.inserted_person.inbox_url.clone(),
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shared_inbox_url: None,
matrix_user_id: None,
ban_expires: None,
instance_id: data.inserted_instance.id,
private_key: data.inserted_person.private_key.clone(),
public_key: data.inserted_person.public_key.clone(),
last_refreshed_at: data.inserted_person.last_refreshed_at,
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},
post: Post {
id: data.inserted_post.id,
name: data.inserted_post.name.clone(),
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creator_id: data.inserted_person.id,
url: None,
body: None,
published: data.inserted_post.published,
updated: None,
community_id: data.inserted_community.id,
removed: false,
deleted: false,
locked: false,
nsfw: false,
embed_title: None,
embed_description: None,
embed_video_url: None,
thumbnail_url: None,
ap_id: data.inserted_post.ap_id.clone(),
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local: true,
language_id: Default::default(),
featured_community: false,
featured_local: false,
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},
community: Community {
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id: data.inserted_community.id,
name: "test community 5".to_string(),
icon: None,
removed: false,
deleted: false,
nsfw: false,
actor_id: data.inserted_community.actor_id.clone(),
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local: true,
title: "nada".to_owned(),
description: None,
updated: None,
banner: None,
hidden: false,
posting_restricted_to_mods: false,
published: data.inserted_community.published,
instance_id: data.inserted_instance.id,
private_key: data.inserted_community.private_key.clone(),
public_key: data.inserted_community.public_key.clone(),
last_refreshed_at: data.inserted_community.last_refreshed_at,
followers_url: data.inserted_community.followers_url.clone(),
inbox_url: data.inserted_community.inbox_url.clone(),
shared_inbox_url: data.inserted_community.shared_inbox_url.clone(),
moderators_url: data.inserted_community.moderators_url.clone(),
featured_url: data.inserted_community.featured_url.clone(),
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},
counts: CommentAggregates {
id: agg.id,
comment_id: data.inserted_comment_0.id,
score: 1,
upvotes: 1,
downvotes: 0,
published: agg.published,
child_count: 5,
},
}
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}
}