crates/db_views/src/private_message_view.rs

   1 use crate::structs::PrivateMessageView;
   2 use diesel::{
   3   debug_query,
   4   pg::Pg,
   5   result::Error,
   6   BoolExpressionMethods,
   7   ExpressionMethods,
   8   JoinOnDsl,
   9   QueryDsl,
  10 };
  11 use diesel_async::RunQueryDsl;
  12 use lemmy_db_schema::{
  13   newtypes::{PersonId, PrivateMessageId},
  14   schema::{person, private_message},
  15   source::{
  16     person::{Person, PersonSafe},
  17     private_message::PrivateMessage,
  18   },
  19   traits::{ToSafe, ViewToVec},
  20   utils::{get_conn, limit_and_offset, DbPool},
  21 };
  22 use tracing::debug;
  23 use typed_builder::TypedBuilder;
  24
  25 type PrivateMessageViewTuple = (PrivateMessage, PersonSafe, PersonSafe);
  26
  27 impl PrivateMessageView {
  28   pub async fn read(pool: &DbPool, private_message_id: PrivateMessageId) -> Result<Self, Error> {
  29     let conn = &mut get_conn(pool).await?;
  30     let person_alias_1 = diesel::alias!(person as person1);
  31
  32     let (private_message, creator, recipient) = private_message::table
  33       .find(private_message_id)
  34       .inner_join(person::table.on(private_message::creator_id.eq(person::id)))
  35       .inner_join(
  36         person_alias_1.on(private_message::recipient_id.eq(person_alias_1.field(person::id))),
  37       )
  38       .order_by(private_message::published.desc())
  39       .select((
  40         private_message::all_columns,
  41         Person::safe_columns_tuple(),
  42         person_alias_1.fields(Person::safe_columns_tuple()),
  43       ))
  44       .first::<PrivateMessageViewTuple>(conn)
  45       .await?;
  46
  47     Ok(PrivateMessageView {
  48       private_message,
  49       creator,
  50       recipient,
  51     })
  52   }
  53
  54   /// Gets the number of unread messages
  55   pub async fn get_unread_messages(pool: &DbPool, my_person_id: PersonId) -> Result<i64, Error> {
  56     use diesel::dsl::count;
  57     let conn = &mut get_conn(pool).await?;
  58     private_message::table
  59       .filter(private_message::read.eq(false))
  60       .filter(private_message::recipient_id.eq(my_person_id))
  61       .filter(private_message::deleted.eq(false))
  62       .select(count(private_message::id))
  63       .first::<i64>(conn)
  64       .await
  65   }
  66 }
  67
  68 #[derive(TypedBuilder)]
  69 #[builder(field_defaults(default))]
  70 pub struct PrivateMessageQuery<'a> {
  71   #[builder(!default)]
  72   pool: &'a DbPool,
  73   #[builder(!default)]
  74   recipient_id: PersonId,
  75   unread_only: Option<bool>,
  76   page: Option<i64>,
  77   limit: Option<i64>,
  78 }
  79
  80 impl<'a> PrivateMessageQuery<'a> {
  81   pub async fn list(self) -> Result<Vec<PrivateMessageView>, Error> {
  82     let conn = &mut get_conn(self.pool).await?;
  83     let person_alias_1 = diesel::alias!(person as person1);
  84
  85     let mut query = private_message::table
  86       .inner_join(person::table.on(private_message::creator_id.eq(person::id)))
  87       .inner_join(
  88         person_alias_1.on(private_message::recipient_id.eq(person_alias_1.field(person::id))),
  89       )
  90       .select((
  91         private_message::all_columns,
  92         Person::safe_columns_tuple(),
  93         person_alias_1.fields(Person::safe_columns_tuple()),
  94       ))
  95       .into_boxed();
  96
  97     // If its unread, I only want the ones to me
  98     if self.unread_only.unwrap_or(false) {
  99       query = query
 100         .filter(private_message::read.eq(false))
 101         .filter(private_message::recipient_id.eq(self.recipient_id));
 102     }
 103     // Otherwise, I want the ALL view to show both sent and received
 104     else {
 105       query = query.filter(
 106         private_message::recipient_id
 107           .eq(self.recipient_id)
 108           .or(private_message::creator_id.eq(self.recipient_id)),
 109       )
 110     }
 111
 112     let (limit, offset) = limit_and_offset(self.page, self.limit)?;
 113
 114     query = query
 115       .filter(private_message::deleted.eq(false))
 116       .limit(limit)
 117       .offset(offset)
 118       .order_by(private_message::published.desc());
 119
 120     debug!(
 121       "Private Message View Query: {:?}",
 122       debug_query::<Pg, _>(&query)
 123     );
 124
 125     let res = query.load::<PrivateMessageViewTuple>(conn).await?;
 126
 127     Ok(PrivateMessageView::from_tuple_to_vec(res))
 128   }
 129 }
 130
 131 impl ViewToVec for PrivateMessageView {
 132   type DbTuple = PrivateMessageViewTuple;
 133   fn from_tuple_to_vec(items: Vec<Self::DbTuple>) -> Vec<Self> {
 134     items
 135       .into_iter()
 136       .map(|a| Self {
 137         private_message: a.0,
 138         creator: a.1,
 139         recipient: a.2,
 140       })
 141       .collect::<Vec<Self>>()
 142   }
 143 }