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       .load::<CommunityFollowerViewTuple>(conn)?;
  32
  33     Ok(Self::from_tuple_to_vec(res))
  34   }
  35
  36   pub fn for_person(conn: &PgConnection, person_id: PersonId) -> Result<Vec<Self>, Error> {
  37     let res = community_follower::table
  38       .inner_join(community::table)
  39       .inner_join(person::table)
  40       .select((
  41         Community::safe_columns_tuple(),
  42         Person::safe_columns_tuple(),
  43       ))
  44       .filter(community_follower::person_id.eq(person_id))
  45       .load::<CommunityFollowerViewTuple>(conn)?;
  46
  47     Ok(Self::from_tuple_to_vec(res))
  48   }
  49 }
  50
  51 impl ViewToVec for CommunityFollowerView {
  52   type DbTuple = CommunityFollowerViewTuple;
  53   fn from_tuple_to_vec(items: Vec<Self::DbTuple>) -> Vec<Self> {
  54     items
  55       .iter()
  56       .map(|a| Self {
  57         community: a.0.to_owned(),
  58         follower: a.1.to_owned(),
  59       })
  60       .collect::<Vec<Self>>()
  61   }
  62 }