lemmy/crates/db_views_actor/src/community_follower_view.rs

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use crate::structs::CommunityFollowerView;
use diesel::{
dsl::{count_star, not},
result::Error,
sql_function,
ExpressionMethods,
QueryDsl,
};
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use diesel_async::RunQueryDsl;
use lemmy_db_schema::{
newtypes::{CommunityId, DbUrl, PersonId},
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schema::{community, community_follower, person},
source::{community::Community, person::Person},
traits::JoinView,
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utils::{get_conn, DbPool},
};
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type CommunityFollowerViewTuple = (Community, Person);
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sql_function!(fn coalesce(x: diesel::sql_types::Nullable<diesel::sql_types::Text>, y: diesel::sql_types::Text) -> diesel::sql_types::Text);
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impl CommunityFollowerView {
pub async fn get_community_follower_inboxes(
pool: &DbPool,
community_id: CommunityId,
) -> Result<Vec<DbUrl>, Error> {
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let conn = &mut get_conn(pool).await?;
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let res = community_follower::table
.filter(community_follower::community_id.eq(community_id))
.filter(not(person::local))
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.inner_join(person::table)
.select(coalesce(person::shared_inbox_url, person::inbox_url))
.distinct()
.load::<DbUrl>(conn)
.await?;
Ok(res)
}
pub async fn count_community_followers(
pool: &DbPool,
community_id: CommunityId,
) -> Result<i64, Error> {
let conn = &mut get_conn(pool).await?;
let res = community_follower::table
.filter(community_follower::community_id.eq(community_id))
.select(count_star())
.first::<i64>(conn)
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.await?;
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Ok(res)
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}
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pub async fn for_person(pool: &DbPool, person_id: PersonId) -> Result<Vec<Self>, Error> {
let conn = &mut get_conn(pool).await?;
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let res = community_follower::table
.inner_join(community::table)
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.inner_join(person::table)
.select((community::all_columns, person::all_columns))
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.filter(community_follower::person_id.eq(person_id))
.filter(community::deleted.eq(false))
.filter(community::removed.eq(false))
.order_by(community::title)
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.load::<CommunityFollowerViewTuple>(conn)
.await?;
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Ok(res.into_iter().map(Self::from_tuple).collect())
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}
}
impl JoinView for CommunityFollowerView {
type JoinTuple = CommunityFollowerViewTuple;
fn from_tuple(a: Self::JoinTuple) -> Self {
Self {
community: a.0,
follower: a.1,
}
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}
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}