lemmy/crates/db_views_actor/src/community_view.rs

247 lines
6.8 KiB
Rust

use crate::{community_moderator_view::CommunityModeratorView, person_view::PersonViewSafe};
use diesel::{result::Error, *};
use lemmy_db_queries::{
aggregates::community_aggregates::CommunityAggregates,
functions::hot_rank,
fuzzy_search,
limit_and_offset,
ListingType,
MaybeOptional,
SortType,
ToSafe,
ViewToVec,
};
use lemmy_db_schema::{
schema::{community, community_aggregates, community_follower, person},
source::{
community::{Community, CommunityFollower, CommunitySafe},
person::{Person, PersonSafe},
},
CommunityId,
PersonId,
};
use serde::Serialize;
#[derive(Debug, Serialize, Clone)]
pub struct CommunityView {
pub community: CommunitySafe,
pub creator: PersonSafe,
pub subscribed: bool,
pub counts: CommunityAggregates,
}
type CommunityViewTuple = (
CommunitySafe,
PersonSafe,
CommunityAggregates,
Option<CommunityFollower>,
);
impl CommunityView {
pub fn read(
conn: &PgConnection,
community_id: CommunityId,
my_person_id: Option<PersonId>,
) -> Result<Self, Error> {
// The left join below will return None in this case
let person_id_join = my_person_id.unwrap_or(PersonId(-1));
let (community, creator, counts, follower) = community::table
.find(community_id)
.inner_join(person::table)
.inner_join(community_aggregates::table)
.left_join(
community_follower::table.on(
community::id
.eq(community_follower::community_id)
.and(community_follower::person_id.eq(person_id_join)),
),
)
.select((
Community::safe_columns_tuple(),
Person::safe_columns_tuple(),
community_aggregates::all_columns,
community_follower::all_columns.nullable(),
))
.first::<CommunityViewTuple>(conn)?;
Ok(CommunityView {
community,
creator,
subscribed: follower.is_some(),
counts,
})
}
// TODO: this function is only used by is_mod_or_admin() below, can probably be merged
fn community_mods_and_admins(
conn: &PgConnection,
community_id: CommunityId,
) -> Result<Vec<PersonId>, Error> {
let mut mods_and_admins: Vec<PersonId> = Vec::new();
mods_and_admins.append(
&mut CommunityModeratorView::for_community(conn, community_id)
.map(|v| v.into_iter().map(|m| m.moderator.id).collect())?,
);
mods_and_admins.append(
&mut PersonViewSafe::admins(conn).map(|v| v.into_iter().map(|a| a.person.id).collect())?,
);
Ok(mods_and_admins)
}
pub fn is_mod_or_admin(
conn: &PgConnection,
person_id: PersonId,
community_id: CommunityId,
) -> bool {
Self::community_mods_and_admins(conn, community_id)
.unwrap_or_default()
.contains(&person_id)
}
}
pub struct CommunityQueryBuilder<'a> {
conn: &'a PgConnection,
listing_type: &'a ListingType,
sort: &'a SortType,
my_person_id: Option<PersonId>,
show_nsfw: bool,
search_term: Option<String>,
page: Option<i64>,
limit: Option<i64>,
}
impl<'a> CommunityQueryBuilder<'a> {
pub fn create(conn: &'a PgConnection) -> Self {
CommunityQueryBuilder {
conn,
my_person_id: None,
listing_type: &ListingType::All,
sort: &SortType::Hot,
show_nsfw: true,
search_term: None,
page: None,
limit: None,
}
}
pub fn listing_type(mut self, listing_type: &'a ListingType) -> Self {
self.listing_type = listing_type;
self
}
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_person_id<T: MaybeOptional<PersonId>>(mut self, my_person_id: T) -> Self {
self.my_person_id = my_person_id.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> {
// 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 = community::table
.inner_join(person::table)
.inner_join(community_aggregates::table)
.left_join(
community_follower::table.on(
community::id
.eq(community_follower::community_id)
.and(community_follower::person_id.eq(person_id_join)),
),
)
.select((
Community::safe_columns_tuple(),
Person::safe_columns_tuple(),
community_aggregates::all_columns,
community_follower::all_columns.nullable(),
))
.into_boxed();
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()),
SortType::TopMonth => query = query.order_by(community_aggregates::users_active_month.desc()),
// Covers all other sorts, including hot
_ => {
query = query
.order_by(
hot_rank(
community_aggregates::subscribers,
community_aggregates::published,
)
.desc(),
)
.then_order_by(community_aggregates::published.desc())
}
};
if !self.show_nsfw {
query = query.filter(community::nsfw.eq(false));
};
query = match self.listing_type {
ListingType::Subscribed => 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.filter(community::local.eq(true)),
_ => query,
};
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))
.load::<CommunityViewTuple>(self.conn)?;
Ok(CommunityView::from_tuple_to_vec(res))
}
}
impl ViewToVec for CommunityView {
type DbTuple = CommunityViewTuple;
fn from_tuple_to_vec(items: Vec<Self::DbTuple>) -> Vec<Self> {
items
.iter()
.map(|a| Self {
community: a.0.to_owned(),
creator: a.1.to_owned(),
counts: a.2.to_owned(),
subscribed: a.3.is_some(),
})
.collect::<Vec<Self>>()
}
}