lemmy/crates/db_views/src/comment_view.rs

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Rust
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use crate::structs::CommentView;
use diesel::{dsl::*, result::Error, *};
use diesel_ltree::{nlevel, subpath, Ltree, LtreeExtensions};
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use lemmy_db_schema::{
aggregates::structs::CommentAggregates,
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newtypes::{CommentId, CommunityId, DbUrl, PersonId, PostId},
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schema::{
comment,
comment_aggregates,
comment_like,
comment_saved,
community,
community_block,
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community_follower,
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community_person_ban,
person,
person_block,
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post,
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},
source::{
comment::{Comment, CommentSaved},
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community::{Community, CommunityFollower, CommunityPersonBan, CommunitySafe},
person::{Person, PersonSafe},
person_block::PersonBlock,
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post::Post,
},
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traits::{MaybeOptional, ToSafe, ViewToVec},
utils::{functions::hot_rank, fuzzy_search, limit_and_offset_unlimited},
CommentSortType,
ListingType,
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};
type CommentViewTuple = (
Comment,
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PersonSafe,
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Post,
CommunitySafe,
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 {
pub fn read(
conn: &PgConnection,
comment_id: CommentId,
my_person_id: Option<PersonId>,
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) -> Result<Self, Error> {
// 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))
.and(
community_person_ban::expires
.is_null()
.or(community_person_ban::expires.gt(now)),
),
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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,
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Person::safe_columns_tuple(),
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post::all_columns,
Community::safe_columns_tuple(),
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(),
))
.first::<CommentViewTuple>(conn)?;
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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,
})
}
}
pub struct CommentQueryBuilder<'a> {
conn: &'a PgConnection,
listing_type: Option<ListingType>,
sort: Option<CommentSortType>,
community_id: Option<CommunityId>,
community_actor_id: Option<DbUrl>,
post_id: Option<PostId>,
parent_path: Option<Ltree>,
creator_id: Option<PersonId>,
my_person_id: Option<PersonId>,
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search_term: Option<String>,
saved_only: Option<bool>,
show_bot_accounts: Option<bool>,
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page: Option<i64>,
limit: Option<i64>,
max_depth: Option<i32>,
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}
impl<'a> CommentQueryBuilder<'a> {
pub fn create(conn: &'a PgConnection) -> Self {
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CommentQueryBuilder {
conn,
listing_type: Some(ListingType::All),
sort: None,
community_id: None,
community_actor_id: None,
post_id: None,
parent_path: None,
creator_id: None,
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my_person_id: None,
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search_term: None,
saved_only: None,
show_bot_accounts: None,
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page: None,
limit: None,
max_depth: None,
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}
}
pub fn listing_type<T: MaybeOptional<ListingType>>(mut self, listing_type: T) -> Self {
self.listing_type = listing_type.get_optional();
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self
}
pub fn sort<T: MaybeOptional<CommentSortType>>(mut self, sort: T) -> Self {
self.sort = sort.get_optional();
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self
}
pub fn post_id<T: MaybeOptional<PostId>>(mut self, post_id: T) -> Self {
self.post_id = post_id.get_optional();
self
}
pub fn creator_id<T: MaybeOptional<PersonId>>(mut self, creator_id: T) -> Self {
self.creator_id = creator_id.get_optional();
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self
}
pub fn community_id<T: MaybeOptional<CommunityId>>(mut self, community_id: T) -> Self {
self.community_id = community_id.get_optional();
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self
}
pub fn my_person_id<T: MaybeOptional<PersonId>>(mut self, my_person_id: T) -> Self {
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self.my_person_id = my_person_id.get_optional();
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self
}
pub fn community_actor_id<T: MaybeOptional<DbUrl>>(mut self, community_actor_id: T) -> Self {
self.community_actor_id = community_actor_id.get_optional();
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self
}
pub fn search_term<T: MaybeOptional<String>>(mut self, search_term: T) -> Self {
self.search_term = search_term.get_optional();
self
}
pub fn saved_only<T: MaybeOptional<bool>>(mut self, saved_only: T) -> Self {
self.saved_only = saved_only.get_optional();
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self
}
pub fn show_bot_accounts<T: MaybeOptional<bool>>(mut self, show_bot_accounts: T) -> Self {
self.show_bot_accounts = show_bot_accounts.get_optional();
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self
}
pub fn parent_path<T: MaybeOptional<Ltree>>(mut self, parent_path: T) -> Self {
self.parent_path = parent_path.get_optional();
self
}
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pub fn page<T: MaybeOptional<i64>>(mut self, page: T) -> Self {
self.page = page.get_optional();
self
}
pub fn limit<T: MaybeOptional<i64>>(mut self, limit: T) -> Self {
self.limit = limit.get_optional();
self
}
pub fn max_depth<T: MaybeOptional<i32>>(mut self, max_depth: T) -> Self {
self.max_depth = max_depth.get_optional();
self
}
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pub fn list(self) -> Result<Vec<CommentView>, Error> {
use diesel::dsl::*;
// The left join below will return None in this case
let person_id_join = self.my_person_id.unwrap_or(PersonId(-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))
.and(
community_person_ban::expires
.is_null()
.or(community_person_ban::expires.gt(now)),
),
),
)
.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)),
),
)
.select((
comment::all_columns,
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Person::safe_columns_tuple(),
post::all_columns,
Community::safe_columns_tuple(),
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(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)),
)
}
}
};
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if let Some(community_id) = self.community_id {
query = query.filter(post::community_id.eq(community_id));
}
if let Some(community_actor_id) = self.community_actor_id {
query = query.filter(community::actor_id.eq(community_actor_id))
}
if self.saved_only.unwrap_or(false) {
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query = query.filter(comment_saved::id.is_not_null());
}
if !self.show_bot_accounts.unwrap_or(true) {
query = query.filter(person::bot_account.eq(false));
};
// Don't show blocked communities or persons
if self.my_person_id.is_some() {
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)
.load::<CommentViewTuple>(self.conn)?;
Ok(CommentView::from_tuple_to_vec(res))
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}
}
impl ViewToVec for CommentView {
type DbTuple = CommentViewTuple;
fn from_tuple_to_vec(items: Vec<Self::DbTuple>) -> Vec<Self> {
items
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.iter()
.map(|a| Self {
comment: a.0.to_owned(),
creator: a.1.to_owned(),
post: a.2.to_owned(),
community: a.3.to_owned(),
counts: a.4.to_owned(),
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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})
.collect::<Vec<Self>>()
}
}
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#[cfg(test)]
mod tests {
use crate::comment_view::*;
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use lemmy_db_schema::{
aggregates::structs::CommentAggregates,
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source::{comment::*, community::*, person::*, person_block::PersonBlockForm, post::*},
traits::{Blockable, Crud, Likeable},
utils::establish_unpooled_connection,
SubscribedType,
};
use serial_test::serial;
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#[test]
#[serial]
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fn test_crud() {
let conn = establish_unpooled_connection();
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let new_person = PersonForm {
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name: "timmy".into(),
public_key: Some("pubkey".to_string()),
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..PersonForm::default()
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};
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let inserted_person = Person::create(&conn, &new_person).unwrap();
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let new_person_2 = PersonForm {
name: "sara".into(),
public_key: Some("pubkey".to_string()),
..PersonForm::default()
};
let inserted_person_2 = Person::create(&conn, &new_person_2).unwrap();
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let new_community = CommunityForm {
name: "test community 5".to_string(),
title: "nada".to_owned(),
public_key: Some("pubkey".to_string()),
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..CommunityForm::default()
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};
let inserted_community = Community::create(&conn, &new_community).unwrap();
let new_post = PostForm {
name: "A test post 2".into(),
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creator_id: inserted_person.id,
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community_id: inserted_community.id,
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..PostForm::default()
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};
let inserted_post = Post::create(&conn, &new_post).unwrap();
// Create a comment tree with this hierarchy
// 0
// \ \
// 1 2
// \
// 3 4
// \
// 5
let comment_form_0 = CommentForm {
content: "Comment 0".into(),
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creator_id: inserted_person.id,
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post_id: inserted_post.id,
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..CommentForm::default()
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};
let inserted_comment_0 = Comment::create(&conn, &comment_form_0, None).unwrap();
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let comment_form_1 = CommentForm {
content: "Comment 1, A test blocked comment".into(),
creator_id: inserted_person_2.id,
post_id: inserted_post.id,
..CommentForm::default()
};
let inserted_comment_1 =
Comment::create(&conn, &comment_form_1, Some(&inserted_comment_0.path)).unwrap();
let comment_form_2 = CommentForm {
content: "Comment 2".into(),
creator_id: inserted_person.id,
post_id: inserted_post.id,
..CommentForm::default()
};
let inserted_comment_2 =
Comment::create(&conn, &comment_form_2, Some(&inserted_comment_0.path)).unwrap();
let comment_form_3 = CommentForm {
content: "Comment 3".into(),
creator_id: inserted_person.id,
post_id: inserted_post.id,
..CommentForm::default()
};
let _inserted_comment_3 =
Comment::create(&conn, &comment_form_3, Some(&inserted_comment_1.path)).unwrap();
let comment_form_4 = CommentForm {
content: "Comment 4".into(),
creator_id: inserted_person.id,
post_id: inserted_post.id,
..CommentForm::default()
};
let inserted_comment_4 =
Comment::create(&conn, &comment_form_4, Some(&inserted_comment_1.path)).unwrap();
let comment_form_5 = CommentForm {
content: "Comment 5".into(),
creator_id: inserted_person.id,
post_id: inserted_post.id,
..CommentForm::default()
};
let _inserted_comment_5 =
Comment::create(&conn, &comment_form_5, Some(&inserted_comment_4.path)).unwrap();
let timmy_blocks_sara_form = PersonBlockForm {
person_id: inserted_person.id,
target_id: inserted_person_2.id,
};
let inserted_block = PersonBlock::block(&conn, &timmy_blocks_sara_form).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,
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post_id: inserted_post.id,
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person_id: inserted_person.id,
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score: 1,
};
let _inserted_comment_like = CommentLike::like(&conn, &comment_like_form).unwrap();
let agg = CommentAggregates::read(&conn, inserted_comment_0.id).unwrap();
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let top_path = inserted_comment_0.to_owned().path;
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let expected_comment_view_no_person = CommentView {
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creator_banned_from_community: false,
my_vote: None,
subscribed: SubscribedType::NotSubscribed,
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saved: false,
creator_blocked: false,
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comment: Comment {
id: inserted_comment_0.id,
content: "Comment 0".into(),
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creator_id: inserted_person.id,
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post_id: inserted_post.id,
removed: false,
deleted: false,
published: inserted_comment_0.published,
ap_id: inserted_comment_0.ap_id,
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updated: None,
local: true,
path: top_path,
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},
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creator: PersonSafe {
id: inserted_person.id,
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name: "timmy".into(),
display_name: None,
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published: inserted_person.published,
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avatar: None,
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actor_id: inserted_person.actor_id.to_owned(),
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local: true,
banned: false,
deleted: false,
admin: false,
bot_account: false,
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bio: None,
banner: None,
updated: None,
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inbox_url: inserted_person.inbox_url.to_owned(),
shared_inbox_url: None,
matrix_user_id: None,
ban_expires: None,
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},
post: Post {
id: inserted_post.id,
name: inserted_post.name.to_owned(),
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creator_id: inserted_person.id,
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url: None,
body: None,
published: inserted_post.published,
updated: None,
community_id: inserted_community.id,
removed: false,
deleted: false,
locked: false,
stickied: false,
nsfw: false,
embed_title: None,
embed_description: None,
embed_video_url: None,
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thumbnail_url: None,
ap_id: inserted_post.ap_id.to_owned(),
local: true,
},
community: CommunitySafe {
id: inserted_community.id,
name: "test community 5".to_string(),
icon: None,
removed: false,
deleted: false,
nsfw: false,
actor_id: inserted_community.actor_id.to_owned(),
local: true,
title: "nada".to_owned(),
description: None,
updated: None,
banner: None,
hidden: false,
posting_restricted_to_mods: false,
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published: inserted_community.published,
},
counts: CommentAggregates {
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id: agg.id,
comment_id: inserted_comment_0.id,
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score: 1,
upvotes: 1,
downvotes: 0,
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published: agg.published,
child_count: 5,
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},
};
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let mut expected_comment_view_with_person = expected_comment_view_no_person.to_owned();
expected_comment_view_with_person.my_vote = Some(1);
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let read_comment_views_no_person = CommentQueryBuilder::create(&conn)
.post_id(inserted_post.id)
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.list()
.unwrap();
assert_eq!(
expected_comment_view_no_person,
read_comment_views_no_person[0]
);
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let read_comment_views_with_person = CommentQueryBuilder::create(&conn)
.post_id(inserted_post.id)
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.my_person_id(inserted_person.id)
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.list()
.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());
let read_comment_from_blocked_person =
CommentView::read(&conn, inserted_comment_1.id, Some(inserted_person.id)).unwrap();
// Make sure block set the creator blocked
assert!(read_comment_from_blocked_person.creator_blocked);
let top_path = inserted_comment_0.path;
let read_comment_views_top_path = CommentQueryBuilder::create(&conn)
.post_id(inserted_post.id)
.parent_path(top_path)
.list()
.unwrap();
let child_path = inserted_comment_1.to_owned().path;
let read_comment_views_child_path = CommentQueryBuilder::create(&conn)
.post_id(inserted_post.id)
.parent_path(child_path)
.list()
.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>>();
assert!(child_comments.contains(&inserted_comment_1));
assert!(!child_comments.contains(&inserted_comment_2));
let read_comment_views_top_max_depth = CommentQueryBuilder::create(&conn)
.post_id(inserted_post.id)
.max_depth(1)
.list()
.unwrap();
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// Make sure a depth limited one only has the top comment
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assert_eq!(
expected_comment_view_no_person,
read_comment_views_top_max_depth[0]
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);
assert_eq!(1, read_comment_views_top_max_depth.len());
let child_path = inserted_comment_1.path;
let read_comment_views_parent_max_depth = CommentQueryBuilder::create(&conn)
.post_id(inserted_post.id)
.parent_path(child_path)
.max_depth(1)
.sort(CommentSortType::New)
.list()
.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());
// Delete everything
let like_removed =
CommentLike::remove(&conn, inserted_person.id, inserted_comment_0.id).unwrap();
let num_deleted = Comment::delete(&conn, inserted_comment_0.id).unwrap();
Comment::delete(&conn, inserted_comment_1.id).unwrap();
Post::delete(&conn, inserted_post.id).unwrap();
Community::delete(&conn, inserted_community.id).unwrap();
Person::delete(&conn, inserted_person.id).unwrap();
Person::delete(&conn, inserted_person_2.id).unwrap();
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assert_eq!(1, num_deleted);
assert_eq!(1, like_removed);
}
}