crates/db_views_actor/src/community_follower_view.rs

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