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