crates/db_views_actor/src/community_moderator_view.rs

   1 use crate::structs::CommunityModeratorView;
   2 use diesel::{result::Error, ExpressionMethods, QueryDsl};
   3 use diesel_async::RunQueryDsl;
   4 use lemmy_db_schema::{
   5   newtypes::{CommunityId, PersonId},
   6   schema::{community, community_moderator, person},
   7   source::{community::Community, person::Person},
   8   traits::JoinView,
   9   utils::{get_conn, DbPool},
  10 };
  11
  12 type CommunityModeratorViewTuple = (Community, Person);
  13
  14 impl CommunityModeratorView {
  15   pub async fn for_community(pool: &DbPool, community_id: CommunityId) -> Result<Vec<Self>, Error> {
  16     let conn = &mut get_conn(pool).await?;
  17     let res = community_moderator::table
  18       .inner_join(community::table)
  19       .inner_join(person::table)
  20       .filter(community_moderator::community_id.eq(community_id))
  21       .select((community::all_columns, person::all_columns))
  22       .order_by(community_moderator::published)
  23       .load::<CommunityModeratorViewTuple>(conn)
  24       .await?;
  25
  26     Ok(res.into_iter().map(Self::from_tuple).collect())
  27   }
  28
  29   pub async fn for_person(pool: &DbPool, person_id: PersonId) -> Result<Vec<Self>, Error> {
  30     let conn = &mut get_conn(pool).await?;
  31     let res = community_moderator::table
  32       .inner_join(community::table)
  33       .inner_join(person::table)
  34       .filter(community_moderator::person_id.eq(person_id))
  35       .filter(community::deleted.eq(false))
  36       .filter(community::removed.eq(false))
  37       .select((community::all_columns, person::all_columns))
  38       .load::<CommunityModeratorViewTuple>(conn)
  39       .await?;
  40
  41     Ok(res.into_iter().map(Self::from_tuple).collect())
  42   }
  43
  44   /// Finds all communities first mods / creators
  45   /// Ideally this should be a group by, but diesel doesn't support it yet
  46   pub async fn get_community_first_mods(pool: &DbPool) -> Result<Vec<Self>, Error> {
  47     let conn = &mut get_conn(pool).await?;
  48     let res = community_moderator::table
  49       .inner_join(community::table)
  50       .inner_join(person::table)
  51       .select((community::all_columns, person::all_columns))
  52       // A hacky workaround instead of group_bys
  53       // https://stackoverflow.com/questions/24042359/how-to-join-only-one-row-in-joined-table-with-postgres
  54       .distinct_on(community_moderator::community_id)
  55       .order_by((
  56         community_moderator::community_id,
  57         community_moderator::person_id,
  58       ))
  59       .load::<CommunityModeratorViewTuple>(conn)
  60       .await?;
  61
  62     Ok(res.into_iter().map(Self::from_tuple).collect())
  63   }
  64 }
  65
  66 impl JoinView for CommunityModeratorView {
  67   type JoinTuple = CommunityModeratorViewTuple;
  68   fn from_tuple(a: Self::JoinTuple) -> Self {
  69     Self {
  70       community: a.0,
  71       moderator: a.1,
  72     }
  73   }
  74 }