lemmy/lemmy_db/src/views/community/community_view.rs

207 lines
5.4 KiB
Rust
Raw Normal View History

2020-12-04 16:29:44 +00:00
use crate::{
2020-12-04 21:35:46 +00:00
aggregates::community_aggregates::CommunityAggregates,
functions::hot_rank,
2020-12-06 03:49:15 +00:00
fuzzy_search,
limit_and_offset,
2020-12-11 01:39:42 +00:00
views::ViewToVec,
2020-12-06 03:49:15 +00:00
MaybeOptional,
SortType,
2020-12-05 04:18:30 +00:00
ToSafe,
2020-12-04 16:29:44 +00:00
};
use diesel::{result::Error, *};
use lemmy_db_schema::{
schema::{category, community, community_aggregates, community_follower, user_},
2020-12-21 12:28:12 +00:00
source::{
category::Category,
2020-12-21 12:28:12 +00:00
community::{Community, CommunityFollower, CommunitySafe},
user::{UserSafe, User_},
},
};
2020-12-04 16:29:44 +00:00
use serde::Serialize;
#[derive(Debug, Serialize, Clone)]
pub struct CommunityView {
2020-12-06 03:49:15 +00:00
pub community: CommunitySafe,
2020-12-04 16:29:44 +00:00
pub creator: UserSafe,
pub category: Category,
pub subscribed: bool,
2020-12-04 21:35:46 +00:00
pub counts: CommunityAggregates,
2020-12-04 16:29:44 +00:00
}
2020-12-11 01:39:42 +00:00
type CommunityViewTuple = (
CommunitySafe,
UserSafe,
Category,
CommunityAggregates,
Option<CommunityFollower>,
);
2020-12-04 16:29:44 +00:00
impl CommunityView {
pub fn read(
conn: &PgConnection,
community_id: i32,
my_user_id: Option<i32>,
) -> Result<Self, Error> {
2020-12-06 03:49:15 +00:00
// The left join below will return None in this case
let user_id_join = my_user_id.unwrap_or(-1);
2020-12-04 16:29:44 +00:00
2020-12-10 20:53:49 +00:00
let (community, creator, category, counts, follower) = community::table
2020-12-04 16:29:44 +00:00
.find(community_id)
.inner_join(user_::table)
.inner_join(category::table)
2020-12-04 21:35:46 +00:00
.inner_join(community_aggregates::table)
2020-12-06 03:49:15 +00:00
.left_join(
community_follower::table.on(
community::id
.eq(community_follower::community_id)
.and(community_follower::user_id.eq(user_id_join)),
),
)
2020-12-05 04:18:30 +00:00
.select((
2020-12-06 03:49:15 +00:00
Community::safe_columns_tuple(),
2020-12-05 04:18:30 +00:00
User_::safe_columns_tuple(),
category::all_columns,
community_aggregates::all_columns,
2020-12-06 03:49:15 +00:00
community_follower::all_columns.nullable(),
2020-12-05 04:18:30 +00:00
))
2020-12-11 01:39:42 +00:00
.first::<CommunityViewTuple>(conn)?;
2020-12-04 16:29:44 +00:00
Ok(CommunityView {
community,
2020-12-05 04:18:30 +00:00
creator,
2020-12-04 16:29:44 +00:00
category,
2020-12-10 20:53:49 +00:00
subscribed: follower.is_some(),
2020-12-04 21:35:46 +00:00
counts,
2020-12-04 16:29:44 +00:00
})
}
}
2020-12-06 03:49:15 +00:00
pub struct CommunityQueryBuilder<'a> {
conn: &'a PgConnection,
sort: &'a SortType,
my_user_id: Option<i32>,
2020-12-06 03:49:15 +00:00
show_nsfw: bool,
search_term: Option<String>,
page: Option<i64>,
limit: Option<i64>,
}
impl<'a> CommunityQueryBuilder<'a> {
pub fn create(conn: &'a PgConnection) -> Self {
2020-12-06 03:49:15 +00:00
CommunityQueryBuilder {
conn,
my_user_id: None,
2020-12-06 03:49:15 +00:00
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 my_user_id<T: MaybeOptional<i32>>(mut self, my_user_id: T) -> Self {
self.my_user_id = my_user_id.get_optional();
self
}
2020-12-06 03:49:15 +00:00
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> {
// The left join below will return None in this case
let user_id_join = self.my_user_id.unwrap_or(-1);
let mut 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();
2020-12-06 03:49:15 +00:00
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())
2020-12-06 03:49:15 +00:00
.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))
2020-12-11 01:39:42 +00:00
.load::<CommunityViewTuple>(self.conn)?;
2020-12-06 03:49:15 +00:00
2020-12-11 01:39:42 +00:00
Ok(CommunityView::to_vec(res))
2020-12-06 03:49:15 +00:00
}
}
2020-12-11 01:39:42 +00:00
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>>()
}
2020-12-06 03:49:15 +00:00
}