lemmy/lemmy_db/src/views/community_view.rs

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Rust
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use crate::{
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aggregates::community_aggregates::CommunityAggregates,
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category::Category,
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community::{Community, CommunityFollower, CommunitySafe},
functions::hot_rank,
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fuzzy_search,
limit_and_offset,
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schema::{category, community, community_aggregates, community_follower, user_},
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user::{UserSafe, User_},
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views::ViewToVec,
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MaybeOptional,
SortType,
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ToSafe,
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};
use diesel::{result::Error, *};
use serde::Serialize;
#[derive(Debug, Serialize, Clone)]
pub struct CommunityView {
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pub community: CommunitySafe,
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pub creator: UserSafe,
pub category: Category,
pub subscribed: bool,
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pub counts: CommunityAggregates,
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}
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type CommunityViewTuple = (
CommunitySafe,
UserSafe,
Category,
CommunityAggregates,
Option<CommunityFollower>,
);
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impl CommunityView {
pub fn read(
conn: &PgConnection,
community_id: i32,
my_user_id: Option<i32>,
) -> Result<Self, Error> {
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// The left join below will return None in this case
let user_id_join = my_user_id.unwrap_or(-1);
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let (community, creator, category, counts, follower) = community::table
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.find(community_id)
.inner_join(user_::table)
.inner_join(category::table)
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.inner_join(community_aggregates::table)
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.left_join(
community_follower::table.on(
community::id
.eq(community_follower::community_id)
.and(community_follower::user_id.eq(user_id_join)),
),
)
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.select((
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Community::safe_columns_tuple(),
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User_::safe_columns_tuple(),
category::all_columns,
community_aggregates::all_columns,
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community_follower::all_columns.nullable(),
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))
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.first::<CommunityViewTuple>(conn)?;
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Ok(CommunityView {
community,
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creator,
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category,
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subscribed: follower.is_some(),
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counts,
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})
}
}
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mod join_types {
use crate::schema::{category, community, community_aggregates, community_follower, user_};
use diesel::{
pg::Pg,
query_builder::BoxedSelectStatement,
query_source::joins::{Inner, Join, JoinOn, LeftOuter},
sql_types::*,
};
/// TODO awful, but necessary because of the boxed join
pub(super) type BoxedCommunityJoin<'a> = BoxedSelectStatement<
'a,
(
(
Integer,
Text,
Text,
Nullable<Text>,
Integer,
Integer,
Bool,
Timestamp,
Nullable<Timestamp>,
Bool,
Bool,
Text,
Bool,
Nullable<Text>,
Nullable<Text>,
),
(
Integer,
Text,
Nullable<Text>,
Nullable<Text>,
Bool,
Bool,
Timestamp,
Nullable<Timestamp>,
Nullable<Text>,
Text,
Nullable<Text>,
Bool,
Nullable<Text>,
Bool,
),
(Integer, Text),
(Integer, Integer, BigInt, BigInt, BigInt),
Nullable<(Integer, Integer, Integer, Timestamp, Nullable<Bool>)>,
),
JoinOn<
Join<
JoinOn<
Join<
JoinOn<
Join<
JoinOn<
Join<community::table, user_::table, Inner>,
diesel::expression::operators::Eq<
diesel::expression::nullable::Nullable<community::columns::creator_id>,
diesel::expression::nullable::Nullable<user_::columns::id>,
>,
>,
category::table,
Inner,
>,
diesel::expression::operators::Eq<
diesel::expression::nullable::Nullable<community::columns::category_id>,
diesel::expression::nullable::Nullable<category::columns::id>,
>,
>,
community_aggregates::table,
Inner,
>,
diesel::expression::operators::Eq<
diesel::expression::nullable::Nullable<community_aggregates::columns::community_id>,
diesel::expression::nullable::Nullable<community::columns::id>,
>,
>,
community_follower::table,
LeftOuter,
>,
diesel::expression::operators::And<
diesel::expression::operators::Eq<
community::columns::id,
community_follower::columns::community_id,
>,
diesel::expression::operators::Eq<
community_follower::columns::user_id,
diesel::expression::bound::Bound<diesel::sql_types::Integer, i32>,
>,
>,
>,
Pg,
>;
}
pub struct CommunityQueryBuilder<'a> {
conn: &'a PgConnection,
query: join_types::BoxedCommunityJoin<'a>,
sort: &'a SortType,
show_nsfw: bool,
search_term: Option<String>,
page: Option<i64>,
limit: Option<i64>,
}
impl<'a> CommunityQueryBuilder<'a> {
pub fn create(conn: &'a PgConnection, my_user_id: Option<i32>) -> Self {
// The left join below will return None in this case
let user_id_join = my_user_id.unwrap_or(-1);
let query = community::table
.inner_join(user_::table)
.inner_join(category::table)
.inner_join(community_aggregates::table)
.left_join(
community_follower::table.on(
community::id
.eq(community_follower::community_id)
.and(community_follower::user_id.eq(user_id_join)),
),
)
.select((
Community::safe_columns_tuple(),
User_::safe_columns_tuple(),
category::all_columns,
community_aggregates::all_columns,
community_follower::all_columns.nullable(),
))
.into_boxed();
CommunityQueryBuilder {
conn,
query,
sort: &SortType::Hot,
show_nsfw: true,
search_term: None,
page: None,
limit: None,
}
}
pub fn sort(mut self, sort: &'a SortType) -> Self {
self.sort = sort;
self
}
pub fn show_nsfw(mut self, show_nsfw: bool) -> Self {
self.show_nsfw = show_nsfw;
self
}
pub fn search_term<T: MaybeOptional<String>>(mut self, search_term: T) -> Self {
self.search_term = search_term.get_optional();
self
}
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 list(self) -> Result<Vec<CommunityView>, Error> {
let mut query = self.query;
if let Some(search_term) = self.search_term {
let searcher = fuzzy_search(&search_term);
query = query
.filter(community::name.ilike(searcher.to_owned()))
.or_filter(community::title.ilike(searcher.to_owned()))
.or_filter(community::description.ilike(searcher));
};
match self.sort {
SortType::New => query = query.order_by(community::published.desc()),
SortType::TopAll => query = query.order_by(community_aggregates::subscribers.desc()),
// Covers all other sorts, including hot
_ => {
query = query
// TODO do custom sql function for hot_rank, make sure this works
.order_by(hot_rank(community_aggregates::subscribers, community::published).desc())
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.then_order_by(community_aggregates::subscribers.desc())
}
};
if !self.show_nsfw {
query = query.filter(community::nsfw.eq(false));
};
let (limit, offset) = limit_and_offset(self.page, self.limit);
let res = query
.limit(limit)
.offset(offset)
.filter(community::removed.eq(false))
.filter(community::deleted.eq(false))
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.load::<CommunityViewTuple>(self.conn)?;
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Ok(CommunityView::to_vec(res))
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}
}
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impl ViewToVec for CommunityView {
type DbTuple = CommunityViewTuple;
fn to_vec(communities: Vec<Self::DbTuple>) -> Vec<Self> {
communities
.iter()
.map(|a| Self {
community: a.0.to_owned(),
creator: a.1.to_owned(),
category: a.2.to_owned(),
counts: a.3.to_owned(),
subscribed: a.4.is_some(),
})
.collect::<Vec<Self>>()
}
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}