crates/db_views_actor/src/community_moderator_view.rs

   1 use diesel::{result::Error, *};
   2 use lemmy_db_queries::{ToSafe, ViewToVec};
   3 use lemmy_db_schema::{
   4   schema::{community, community_moderator, 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 CommunityModeratorView {
  16   pub community: CommunitySafe,
  17   pub moderator: PersonSafe,
  18 }
  19
  20 type CommunityModeratorViewTuple = (CommunitySafe, PersonSafe);
  21
  22 impl CommunityModeratorView {
  23   pub fn for_community(conn: &PgConnection, community_id: CommunityId) -> Result<Vec<Self>, Error> {
  24     let res = community_moderator::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_moderator::community_id.eq(community_id))
  32       .order_by(community_moderator::published)
  33       .load::<CommunityModeratorViewTuple>(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_moderator::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_moderator::person_id.eq(person_id))
  47       .order_by(community_moderator::published)
  48       .load::<CommunityModeratorViewTuple>(conn)?;
  49
  50     Ok(Self::from_tuple_to_vec(res))
  51   }
  52
  53   /// Finds all communities first mods / creators
  54   /// Ideally this should be a group by, but diesel doesn't support it yet
  55   pub fn get_community_first_mods(conn: &PgConnection) -> Result<Vec<Self>, Error> {
  56     let res = community_moderator::table
  57       .inner_join(community::table)
  58       .inner_join(person::table)
  59       .select((
  60         Community::safe_columns_tuple(),
  61         Person::safe_columns_tuple(),
  62       ))
  63       // A hacky workaround instead of group_bys
  64       // https://stackoverflow.com/questions/24042359/how-to-join-only-one-row-in-joined-table-with-postgres
  65       .distinct_on(community_moderator::community_id)
  66       .order_by((
  67         community_moderator::community_id,
  68         community_moderator::person_id,
  69       ))
  70       .load::<CommunityModeratorViewTuple>(conn)?;
  71
  72     Ok(Self::from_tuple_to_vec(res))
  73   }
  74 }
  75
  76 impl ViewToVec for CommunityModeratorView {
  77   type DbTuple = CommunityModeratorViewTuple;
  78   fn from_tuple_to_vec(items: Vec<Self::DbTuple>) -> Vec<Self> {
  79     items
  80       .iter()
  81       .map(|a| Self {
  82         community: a.0.to_owned(),
  83         moderator: a.1.to_owned(),
  84       })
  85       .collect::<Vec<Self>>()
  86   }
  87 }