crates/db_views_actor/src/community_follower_view.rs

   1 use diesel::{result::Error, *};
   2 use lemmy_db_queries::{ToSafe, ViewToVec};
   3 use lemmy_db_schema::{
   4   schema::{community, community_follower, person},
   5   source::{
   6     community::{Community, CommunitySafe},
   7     person::{Person, PersonSafe},
   8   },
   9   CommunityId,
  10   PersonId,
  11 };
  12 use serde::{Deserialize, Serialize};
  13
  14 #[derive(Debug, Serialize, Deserialize, Clone)]
  15 pub struct CommunityFollowerView {
  16   pub community: CommunitySafe,
  17   pub follower: PersonSafe,
  18 }
  19
  20 type CommunityFollowerViewTuple = (CommunitySafe, PersonSafe);
  21
  22 impl CommunityFollowerView {
  23   pub fn for_community(conn: &PgConnection, community_id: CommunityId) -> Result<Vec<Self>, Error> {
  24     let res = community_follower::table
  25       .inner_join(community::table)
  26       .inner_join(person::table)
  27       .select((
  28         Community::safe_columns_tuple(),
  29         Person::safe_columns_tuple(),
  30       ))
  31       .filter(community_follower::community_id.eq(community_id))
  32       .order_by(community_follower::published)
  33       .load::<CommunityFollowerViewTuple>(conn)?;
  34
  35     Ok(Self::from_tuple_to_vec(res))
  36   }
  37
  38   pub fn for_person(conn: &PgConnection, person_id: PersonId) -> Result<Vec<Self>, Error> {
  39     let res = community_follower::table
  40       .inner_join(community::table)
  41       .inner_join(person::table)
  42       .select((
  43         Community::safe_columns_tuple(),
  44         Person::safe_columns_tuple(),
  45       ))
  46       .filter(community_follower::person_id.eq(person_id))
  47       .order_by(community_follower::published)
  48       .load::<CommunityFollowerViewTuple>(conn)?;
  49
  50     Ok(Self::from_tuple_to_vec(res))
  51   }
  52 }
  53
  54 impl ViewToVec for CommunityFollowerView {
  55   type DbTuple = CommunityFollowerViewTuple;
  56   fn from_tuple_to_vec(items: Vec<Self::DbTuple>) -> Vec<Self> {
  57     items
  58       .iter()
  59       .map(|a| Self {
  60         community: a.0.to_owned(),
  61         follower: a.1.to_owned(),
  62       })
  63       .collect::<Vec<Self>>()
  64   }
  65 }