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