use crate::{ aggregates::community_aggregates::CommunityAggregates, functions::hot_rank, fuzzy_search, limit_and_offset, views::ViewToVec, MaybeOptional, SortType, ToSafe, }; use diesel::{result::Error, *}; use lemmy_db_schema::{ schema::{category, community, community_aggregates, community_follower, user_}, source::{ category::Category, community::{Community, CommunityFollower, CommunitySafe}, user::{UserSafe, User_}, }, }; use serde::Serialize; #[derive(Debug, Serialize, Clone)] pub struct CommunityView { pub community: CommunitySafe, pub creator: UserSafe, pub category: Category, pub subscribed: bool, pub counts: CommunityAggregates, } type CommunityViewTuple = ( CommunitySafe, UserSafe, Category, CommunityAggregates, Option, ); impl CommunityView { pub fn read( conn: &PgConnection, community_id: i32, my_user_id: Option, ) -> Result { // The left join below will return None in this case let user_id_join = my_user_id.unwrap_or(-1); let (community, creator, category, counts, follower) = community::table .find(community_id) .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(), )) .first::(conn)?; Ok(CommunityView { community, creator, category, subscribed: follower.is_some(), counts, }) } } pub struct CommunityQueryBuilder<'a> { conn: &'a PgConnection, sort: &'a SortType, my_user_id: Option, show_nsfw: bool, search_term: Option, page: Option, limit: Option, } impl<'a> CommunityQueryBuilder<'a> { pub fn create(conn: &'a PgConnection) -> Self { CommunityQueryBuilder { conn, my_user_id: None, 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>(mut self, search_term: T) -> Self { self.search_term = search_term.get_optional(); self } pub fn my_user_id>(mut self, my_user_id: T) -> Self { self.my_user_id = my_user_id.get_optional(); self } pub fn page>(mut self, page: T) -> Self { self.page = page.get_optional(); self } pub fn limit>(mut self, limit: T) -> Self { self.limit = limit.get_optional(); self } pub fn list(self) -> Result, 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(); 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()) .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)) .load::(self.conn)?; Ok(CommunityView::to_vec(res)) } } impl ViewToVec for CommunityView { type DbTuple = CommunityViewTuple; fn to_vec(communities: Vec) -> Vec { 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::>() } }