lemmy/crates/db_views_actor/src/community_view.rs

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use crate::{community_moderator_view::CommunityModeratorView, user_view::UserViewSafe};
use diesel::{result::Error, *};
use lemmy_db_queries::{
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aggregates::community_aggregates::CommunityAggregates,
functions::hot_rank,
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fuzzy_search,
limit_and_offset,
ListingType,
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MaybeOptional,
SortType,
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ToSafe,
ViewToVec,
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};
use lemmy_db_schema::{
schema::{category, community, community_aggregates, community_follower, user_},
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source::{
category::Category,
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community::{Community, CommunityFollower, CommunitySafe},
user::{UserSafe, User_},
},
};
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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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})
}
// 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: i32) -> Result<Vec<i32>, Error> {
let mut mods_and_admins: Vec<i32> = 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 UserViewSafe::admins(conn).map(|v| v.into_iter().map(|a| a.user.id).collect())?);
Ok(mods_and_admins)
}
pub fn is_mod_or_admin(conn: &PgConnection, user_id: i32, community_id: i32) -> bool {
Self::community_mods_and_admins(conn, community_id)
.unwrap_or_default()
.contains(&user_id)
}
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}
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pub struct CommunityQueryBuilder<'a> {
conn: &'a PgConnection,
listing_type: &'a ListingType,
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sort: &'a SortType,
my_user_id: Option<i32>,
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show_nsfw: bool,
search_term: Option<String>,
page: Option<i64>,
limit: Option<i64>,
}
impl<'a> CommunityQueryBuilder<'a> {
pub fn create(conn: &'a PgConnection) -> Self {
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CommunityQueryBuilder {
conn,
my_user_id: None,
listing_type: &ListingType::All,
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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
}
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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
}
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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 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();
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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
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.order_by(
hot_rank(
community_aggregates::subscribers,
community_aggregates::published,
)
.desc(),
)
.then_order_by(community_aggregates::published.desc())
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}
};
if !self.show_nsfw {
query = query.filter(community::nsfw.eq(false));
};
query = match self.listing_type {
ListingType::Subscribed => query.filter(community_follower::user_id.is_not_null()), // TODO could be this: and(community_follower::user_id.eq(user_id_join)),
ListingType::Local => query.filter(community::local.eq(true)),
_ => query,
};
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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::from_tuple_to_vec(res))
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}
}
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impl ViewToVec for CommunityView {
type DbTuple = CommunityViewTuple;
fn from_tuple_to_vec(items: Vec<Self::DbTuple>) -> Vec<Self> {
items
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.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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}