crates/db_views_actor/src/community_moderator_view.rs

   1 use crate::structs::CommunityModeratorView;
   2 use diesel::{result::Error, *};
   3 use lemmy_db_schema::{
   4   newtypes::{CommunityId, PersonId},
   5   schema::{community, community_moderator, person},
   6   source::{
   7     community::{Community, CommunitySafe},
   8     person::{Person, PersonSafe},
   9   },
  10   traits::{ToSafe, ViewToVec},
  11 };
  12
  13 type CommunityModeratorViewTuple = (CommunitySafe, PersonSafe);
  14
  15 impl CommunityModeratorView {
  16   pub fn for_community(conn: &PgConnection, community_id: CommunityId) -> Result<Vec<Self>, Error> {
  17     let res = community_moderator::table
  18       .inner_join(community::table)
  19       .inner_join(person::table)
  20       .select((
  21         Community::safe_columns_tuple(),
  22         Person::safe_columns_tuple(),
  23       ))
  24       .filter(community_moderator::community_id.eq(community_id))
  25       .order_by(community_moderator::published)
  26       .load::<CommunityModeratorViewTuple>(conn)?;
  27
  28     Ok(Self::from_tuple_to_vec(res))
  29   }
  30
  31   pub fn for_person(conn: &PgConnection, person_id: PersonId) -> Result<Vec<Self>, Error> {
  32     let res = community_moderator::table
  33       .inner_join(community::table)
  34       .inner_join(person::table)
  35       .select((
  36         Community::safe_columns_tuple(),
  37         Person::safe_columns_tuple(),
  38       ))
  39       .filter(community_moderator::person_id.eq(person_id))
  40       .order_by(community_moderator::published)
  41       .load::<CommunityModeratorViewTuple>(conn)?;
  42
  43     Ok(Self::from_tuple_to_vec(res))
  44   }
  45
  46   /// Finds all communities first mods / creators
  47   /// Ideally this should be a group by, but diesel doesn't support it yet
  48   pub fn get_community_first_mods(conn: &PgConnection) -> Result<Vec<Self>, Error> {
  49     let res = community_moderator::table
  50       .inner_join(community::table)
  51       .inner_join(person::table)
  52       .select((
  53         Community::safe_columns_tuple(),
  54         Person::safe_columns_tuple(),
  55       ))
  56       // A hacky workaround instead of group_bys
  57       // https://stackoverflow.com/questions/24042359/how-to-join-only-one-row-in-joined-table-with-postgres
  58       .distinct_on(community_moderator::community_id)
  59       .order_by((
  60         community_moderator::community_id,
  61         community_moderator::person_id,
  62       ))
  63       .load::<CommunityModeratorViewTuple>(conn)?;
  64
  65     Ok(Self::from_tuple_to_vec(res))
  66   }
  67 }
  68
  69 impl ViewToVec for CommunityModeratorView {
  70   type DbTuple = CommunityModeratorViewTuple;
  71   fn from_tuple_to_vec(items: Vec<Self::DbTuple>) -> Vec<Self> {
  72     items
  73       .into_iter()
  74       .map(|a| Self {
  75         community: a.0,
  76         moderator: a.1,
  77       })
  78       .collect::<Vec<Self>>()
  79   }
  80 }