lemmy/crates/db_views_actor/src/community_follower_view.rs

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use crate::structs::CommunityFollowerView;
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use diesel::{result::Error, *};
use lemmy_db_schema::{
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newtypes::{CommunityId, PersonId},
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schema::{community, community_follower, person},
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source::{
community::{Community, CommunitySafe},
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person::{Person, PersonSafe},
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},
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traits::{ToSafe, ViewToVec},
};
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type CommunityFollowerViewTuple = (CommunitySafe, PersonSafe, bool);
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impl CommunityFollowerView {
pub fn for_community(conn: &PgConnection, community_id: CommunityId) -> Result<Vec<Self>, Error> {
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let res = community_follower::table
.inner_join(community::table)
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.inner_join(person::table)
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.select((
Community::safe_columns_tuple(),
Person::safe_columns_tuple(),
community_follower::pending,
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))
.filter(community_follower::community_id.eq(community_id))
.order_by(community::title)
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.load::<CommunityFollowerViewTuple>(conn)?;
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Ok(Self::from_tuple_to_vec(res))
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}
pub fn for_person(conn: &PgConnection, person_id: PersonId) -> Result<Vec<Self>, Error> {
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let res = community_follower::table
.inner_join(community::table)
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.inner_join(person::table)
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.select((
Community::safe_columns_tuple(),
Person::safe_columns_tuple(),
community_follower::pending,
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))
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.filter(community_follower::person_id.eq(person_id))
.order_by(community::title)
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.load::<CommunityFollowerViewTuple>(conn)?;
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Ok(Self::from_tuple_to_vec(res))
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}
pub fn read(
conn: &PgConnection,
community_id: CommunityId,
person_id: PersonId,
) -> Result<Self, Error> {
let (community, follower, pending) = community_follower::table
.inner_join(community::table)
.inner_join(person::table)
.select((
Community::safe_columns_tuple(),
Person::safe_columns_tuple(),
community_follower::pending,
))
.filter(community_follower::person_id.eq(person_id))
.filter(community_follower::community_id.eq(community_id))
.first::<CommunityFollowerViewTuple>(conn)?;
Ok(Self {
community,
follower,
pending,
})
}
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}
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impl ViewToVec for CommunityFollowerView {
type DbTuple = CommunityFollowerViewTuple;
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(),
follower: a.1.to_owned(),
pending: a.2.to_owned(),
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})
.collect::<Vec<Self>>()
}
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}