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       .order_by(community_moderator::published)
  44       .load::<CommunityModeratorViewTuple>(conn)?;
  45
  46     Ok(Self::from_tuple_to_vec(res))
  47   }
  48
  49   /// Finds all communities first mods / creators
  50   /// Ideally this should be a group by, but diesel doesn't support it yet
  51   pub fn get_community_first_mods(conn: &mut PgConnection) -> Result<Vec<Self>, Error> {
  52     let res = community_moderator::table
  53       .inner_join(community::table)
  54       .inner_join(person::table)
  55       .select((
  56         Community::safe_columns_tuple(),
  57         Person::safe_columns_tuple(),
  58       ))
  59       // A hacky workaround instead of group_bys
  60       // https://stackoverflow.com/questions/24042359/how-to-join-only-one-row-in-joined-table-with-postgres
  61       .distinct_on(community_moderator::community_id)
  62       .order_by((
  63         community_moderator::community_id,
  64         community_moderator::person_id,
  65       ))
  66       .load::<CommunityModeratorViewTuple>(conn)?;
  67
  68     Ok(Self::from_tuple_to_vec(res))
  69   }
  70 }
  71
  72 impl ViewToVec for CommunityModeratorView {
  73   type DbTuple = CommunityModeratorViewTuple;
  74   fn from_tuple_to_vec(items: Vec<Self::DbTuple>) -> Vec<Self> {
  75     items
  76       .into_iter()
  77       .map(|a| Self {
  78         community: a.0,
  79         moderator: a.1,
  80       })
  81       .collect::<Vec<Self>>()
  82   }
  83 }