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(
  17     conn: &mut PgConnection,
  18     community_id: CommunityId,
  19   ) -> Result<Vec<Self>, Error> {
  20     let res = community_moderator::table
  21       .inner_join(community::table)
  22       .inner_join(person::table)
  23       .select((
  24         Community::safe_columns_tuple(),
  25         Person::safe_columns_tuple(),
  26       ))
  27       .filter(community_moderator::community_id.eq(community_id))
  28       .order_by(community_moderator::published)
  29       .load::<CommunityModeratorViewTuple>(conn)?;
  30
  31     Ok(Self::from_tuple_to_vec(res))
  32   }
  33
  34   pub fn for_person(conn: &mut PgConnection, person_id: PersonId) -> Result<Vec<Self>, Error> {
  35     let res = community_moderator::table
  36       .inner_join(community::table)
  37       .inner_join(person::table)
  38       .select((
  39         Community::safe_columns_tuple(),
  40         Person::safe_columns_tuple(),
  41       ))
  42       .filter(community_moderator::person_id.eq(person_id))
  43       .filter(community::deleted.eq(false))
  44       .filter(community::removed.eq(false))
  45       .order_by(community_moderator::published)
  46       .load::<CommunityModeratorViewTuple>(conn)?;
  47
  48     Ok(Self::from_tuple_to_vec(res))
  49   }
  50
  51   /// Finds all communities first mods / creators
  52   /// Ideally this should be a group by, but diesel doesn't support it yet
  53   pub fn get_community_first_mods(conn: &mut PgConnection) -> Result<Vec<Self>, Error> {
  54     let res = community_moderator::table
  55       .inner_join(community::table)
  56       .inner_join(person::table)
  57       .select((
  58         Community::safe_columns_tuple(),
  59         Person::safe_columns_tuple(),
  60       ))
  61       // A hacky workaround instead of group_bys
  62       // https://stackoverflow.com/questions/24042359/how-to-join-only-one-row-in-joined-table-with-postgres
  63       .distinct_on(community_moderator::community_id)
  64       .order_by((
  65         community_moderator::community_id,
  66         community_moderator::person_id,
  67       ))
  68       .load::<CommunityModeratorViewTuple>(conn)?;
  69
  70     Ok(Self::from_tuple_to_vec(res))
  71   }
  72 }
  73
  74 impl ViewToVec for CommunityModeratorView {
  75   type DbTuple = CommunityModeratorViewTuple;
  76   fn from_tuple_to_vec(items: Vec<Self::DbTuple>) -> Vec<Self> {
  77     items
  78       .into_iter()
  79       .map(|a| Self {
  80         community: a.0,
  81         moderator: a.1,
  82       })
  83       .collect::<Vec<Self>>()
  84   }
  85 }