lemmy/lemmy_db/src/views/comment_view.rs

663 lines
19 KiB
Rust
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2020-12-15 15:28:25 +00:00
use crate::{
aggregates::comment_aggregates::CommentAggregates,
functions::hot_rank,
fuzzy_search,
limit_and_offset,
schema::{
comment,
comment_aggregates,
comment_alias_1,
comment_like,
comment_saved,
community,
community_follower,
community_user_ban,
post,
user_,
user_alias_1,
},
source::{
comment::{Comment, CommentAlias1, CommentSaved},
community::{Community, CommunityFollower, CommunitySafe, CommunityUserBan},
post::Post,
user::{UserAlias1, UserSafe, UserSafeAlias1, User_},
},
views::ViewToVec,
ListingType,
MaybeOptional,
SortType,
ToSafe,
};
use diesel::{result::Error, *};
use serde::Serialize;
#[derive(Debug, PartialEq, Serialize, Clone)]
pub struct CommentView {
pub comment: Comment,
pub creator: UserSafe,
pub recipient: Option<UserSafeAlias1>, // Left joins to comment and user
pub post: Post,
pub community: CommunitySafe,
pub counts: CommentAggregates,
pub creator_banned_from_community: bool, // Left Join to CommunityUserBan
pub subscribed: bool, // Left join to CommunityFollower
pub saved: bool, // Left join to CommentSaved
pub my_vote: Option<i16>, // Left join to CommentLike
}
type CommentViewTuple = (
Comment,
UserSafe,
Option<CommentAlias1>,
Option<UserSafeAlias1>,
Post,
CommunitySafe,
CommentAggregates,
Option<CommunityUserBan>,
Option<CommunityFollower>,
Option<CommentSaved>,
Option<i16>,
);
impl CommentView {
pub fn read(
conn: &PgConnection,
comment_id: i32,
my_user_id: Option<i32>,
) -> Result<Self, Error> {
// The left join below will return None in this case
let user_id_join = my_user_id.unwrap_or(-1);
let (
comment,
creator,
_parent_comment,
recipient,
post,
community,
counts,
creator_banned_from_community,
subscribed,
saved,
my_vote,
) = comment::table
.find(comment_id)
.inner_join(user_::table)
// recipient here
.left_join(comment_alias_1::table.on(comment_alias_1::id.nullable().eq(comment::parent_id)))
.left_join(user_alias_1::table.on(user_alias_1::id.eq(comment_alias_1::creator_id)))
.inner_join(post::table)
.inner_join(community::table.on(post::community_id.eq(community::id)))
.inner_join(comment_aggregates::table)
.left_join(
community_user_ban::table.on(
community::id
.eq(community_user_ban::community_id)
.and(community_user_ban::user_id.eq(comment::creator_id)),
),
)
.left_join(
community_follower::table.on(
post::community_id
.eq(community_follower::community_id)
.and(community_follower::user_id.eq(user_id_join)),
),
)
.left_join(
comment_saved::table.on(
comment::id
.eq(comment_saved::comment_id)
.and(comment_saved::user_id.eq(user_id_join)),
),
)
.left_join(
comment_like::table.on(
comment::id
.eq(comment_like::comment_id)
.and(comment_like::user_id.eq(user_id_join)),
),
)
.select((
comment::all_columns,
User_::safe_columns_tuple(),
comment_alias_1::all_columns.nullable(),
UserAlias1::safe_columns_tuple().nullable(),
post::all_columns,
Community::safe_columns_tuple(),
comment_aggregates::all_columns,
community_user_ban::all_columns.nullable(),
community_follower::all_columns.nullable(),
comment_saved::all_columns.nullable(),
comment_like::score.nullable(),
))
.first::<CommentViewTuple>(conn)?;
Ok(CommentView {
comment,
recipient,
post,
creator,
community,
counts,
creator_banned_from_community: creator_banned_from_community.is_some(),
subscribed: subscribed.is_some(),
saved: saved.is_some(),
my_vote,
})
}
}
mod join_types {
use crate::schema::{
comment,
comment_aggregates,
comment_alias_1,
comment_like,
comment_saved,
community,
community_follower,
community_user_ban,
post,
user_,
user_alias_1,
};
use diesel::{
pg::Pg,
query_builder::BoxedSelectStatement,
query_source::joins::{Inner, Join, JoinOn, LeftOuter},
sql_types::*,
};
// /// TODO awful, but necessary because of the boxed join
pub(super) type BoxedCommentJoin<'a> = BoxedSelectStatement<
'a,
(
(
Integer,
Integer,
Integer,
Nullable<Integer>,
Text,
Bool,
Bool,
Timestamp,
Nullable<Timestamp>,
Bool,
Text,
Bool,
),
(
Integer,
Text,
Nullable<Text>,
Nullable<Text>,
Bool,
Bool,
Timestamp,
Nullable<Timestamp>,
Nullable<Text>,
Text,
Nullable<Text>,
Bool,
Nullable<Text>,
Bool,
),
Nullable<(
Integer,
Integer,
Integer,
Nullable<Integer>,
Text,
Bool,
Bool,
Timestamp,
Nullable<Timestamp>,
Bool,
Text,
Bool,
)>,
Nullable<(
Integer,
Text,
Nullable<Text>,
Nullable<Text>,
Bool,
Bool,
Timestamp,
Nullable<Timestamp>,
Nullable<Text>,
Text,
Nullable<Text>,
Bool,
Nullable<Text>,
Bool,
)>,
(
Integer,
Text,
Nullable<Text>,
Nullable<Text>,
Integer,
Integer,
Bool,
Bool,
Timestamp,
Nullable<Timestamp>,
Bool,
Bool,
Bool,
Nullable<Text>,
Nullable<Text>,
Nullable<Text>,
Nullable<Text>,
Text,
Bool,
),
(
Integer,
Text,
Text,
Nullable<Text>,
Integer,
Integer,
Bool,
Timestamp,
Nullable<Timestamp>,
Bool,
Bool,
Text,
Bool,
Nullable<Text>,
Nullable<Text>,
),
(Integer, Integer, BigInt, BigInt, BigInt),
Nullable<(Integer, Integer, Integer, Timestamp)>,
Nullable<(Integer, Integer, Integer, Timestamp, Nullable<Bool>)>,
Nullable<(Integer, Integer, Integer, Timestamp)>,
Nullable<SmallInt>,
),
JoinOn<
Join<
JoinOn<
Join<
JoinOn<
Join<
JoinOn<
Join<
JoinOn<
Join<
JoinOn<
Join<
JoinOn<
Join<
JoinOn<
Join<
JoinOn<
Join<
JoinOn<
Join<comment::table, user_::table, Inner>,
diesel::expression::operators::Eq<
diesel::expression::nullable::Nullable<
comment::columns::creator_id,
>,
diesel::expression::nullable::Nullable<
user_::columns::id,
>,
>,
>,
comment_alias_1::table,
LeftOuter,
>,
diesel::expression::operators::Eq<
diesel::expression::nullable::Nullable<
comment_alias_1::columns::id,
>,
comment::columns::parent_id,
>,
>,
user_alias_1::table,
LeftOuter,
>,
diesel::expression::operators::Eq<
user_alias_1::columns::id,
comment_alias_1::columns::creator_id,
>,
>,
post::table,
Inner,
>,
diesel::expression::operators::Eq<
diesel::expression::nullable::Nullable<comment::columns::post_id>,
diesel::expression::nullable::Nullable<post::columns::id>,
>,
>,
community::table,
Inner,
>,
diesel::expression::operators::Eq<
post::columns::community_id,
community::columns::id,
>,
>,
comment_aggregates::table,
Inner,
>,
diesel::expression::operators::Eq<
diesel::expression::nullable::Nullable<
comment_aggregates::columns::comment_id,
>,
diesel::expression::nullable::Nullable<comment::columns::id>,
>,
>,
community_user_ban::table,
LeftOuter,
>,
diesel::expression::operators::And<
diesel::expression::operators::Eq<
community::columns::id,
community_user_ban::columns::community_id,
>,
diesel::expression::operators::Eq<
community_user_ban::columns::user_id,
comment::columns::creator_id,
>,
>,
>,
community_follower::table,
LeftOuter,
>,
diesel::expression::operators::And<
diesel::expression::operators::Eq<
post::columns::community_id,
community_follower::columns::community_id,
>,
diesel::expression::operators::Eq<
community_follower::columns::user_id,
diesel::expression::bound::Bound<Integer, i32>,
>,
>,
>,
comment_saved::table,
LeftOuter,
>,
diesel::expression::operators::And<
diesel::expression::operators::Eq<
comment::columns::id,
comment_saved::columns::comment_id,
>,
diesel::expression::operators::Eq<
comment_saved::columns::user_id,
diesel::expression::bound::Bound<Integer, i32>,
>,
>,
>,
comment_like::table,
LeftOuter,
>,
diesel::expression::operators::And<
diesel::expression::operators::Eq<comment::columns::id, comment_like::columns::comment_id>,
diesel::expression::operators::Eq<
comment_like::columns::user_id,
diesel::expression::bound::Bound<Integer, i32>,
>,
>,
>,
Pg,
>;
}
pub struct CommentQueryBuilder<'a> {
conn: &'a PgConnection,
query: join_types::BoxedCommentJoin<'a>,
listing_type: ListingType,
sort: &'a SortType,
for_community_id: Option<i32>,
for_community_name: Option<String>,
for_post_id: Option<i32>,
for_creator_id: Option<i32>,
for_recipient_id: Option<i32>,
search_term: Option<String>,
saved_only: bool,
unread_only: bool,
page: Option<i64>,
limit: Option<i64>,
}
impl<'a> CommentQueryBuilder<'a> {
pub fn create(conn: &'a PgConnection, my_user_id: Option<i32>) -> Self {
// The left join below will return None in this case
let user_id_join = my_user_id.unwrap_or(-1);
let query = comment::table
.inner_join(user_::table)
// recipient here
.left_join(comment_alias_1::table.on(comment_alias_1::id.nullable().eq(comment::parent_id)))
.left_join(user_alias_1::table.on(user_alias_1::id.eq(comment_alias_1::creator_id)))
.inner_join(post::table)
.inner_join(community::table.on(post::community_id.eq(community::id)))
.inner_join(comment_aggregates::table)
.left_join(
community_user_ban::table.on(
community::id
.eq(community_user_ban::community_id)
.and(community_user_ban::user_id.eq(comment::creator_id)),
),
)
.left_join(
community_follower::table.on(
post::community_id
.eq(community_follower::community_id)
.and(community_follower::user_id.eq(user_id_join)),
),
)
.left_join(
comment_saved::table.on(
comment::id
.eq(comment_saved::comment_id)
.and(comment_saved::user_id.eq(user_id_join)),
),
)
.left_join(
comment_like::table.on(
comment::id
.eq(comment_like::comment_id)
.and(comment_like::user_id.eq(user_id_join)),
),
)
.select((
comment::all_columns,
User_::safe_columns_tuple(),
comment_alias_1::all_columns.nullable(),
UserAlias1::safe_columns_tuple().nullable(),
post::all_columns,
Community::safe_columns_tuple(),
comment_aggregates::all_columns,
community_user_ban::all_columns.nullable(),
community_follower::all_columns.nullable(),
comment_saved::all_columns.nullable(),
comment_like::score.nullable(),
))
.into_boxed();
CommentQueryBuilder {
conn,
query,
listing_type: ListingType::All,
sort: &SortType::New,
for_community_id: None,
for_community_name: None,
for_post_id: None,
for_creator_id: None,
for_recipient_id: None,
search_term: None,
saved_only: false,
unread_only: false,
page: None,
limit: None,
}
}
pub fn listing_type(mut self, listing_type: ListingType) -> Self {
self.listing_type = listing_type;
self
}
pub fn sort(mut self, sort: &'a SortType) -> Self {
self.sort = sort;
self
}
pub fn for_post_id<T: MaybeOptional<i32>>(mut self, for_post_id: T) -> Self {
self.for_post_id = for_post_id.get_optional();
self
}
pub fn for_creator_id<T: MaybeOptional<i32>>(mut self, for_creator_id: T) -> Self {
self.for_creator_id = for_creator_id.get_optional();
self
}
pub fn for_recipient_id<T: MaybeOptional<i32>>(mut self, for_recipient_id: T) -> Self {
self.for_creator_id = for_recipient_id.get_optional();
self
}
pub fn for_community_id<T: MaybeOptional<i32>>(mut self, for_community_id: T) -> Self {
self.for_community_id = for_community_id.get_optional();
self
}
pub fn for_community_name<T: MaybeOptional<String>>(mut self, for_community_name: T) -> Self {
self.for_community_name = for_community_name.get_optional();
self
}
pub fn search_term<T: MaybeOptional<String>>(mut self, search_term: T) -> Self {
self.search_term = search_term.get_optional();
self
}
pub fn saved_only(mut self, saved_only: bool) -> Self {
self.saved_only = saved_only;
self
}
pub fn unread_only(mut self, unread_only: bool) -> Self {
self.unread_only = unread_only;
self
}
pub fn page<T: MaybeOptional<i64>>(mut self, page: T) -> Self {
self.page = page.get_optional();
self
}
pub fn limit<T: MaybeOptional<i64>>(mut self, limit: T) -> Self {
self.limit = limit.get_optional();
self
}
pub fn list(self) -> Result<Vec<CommentView>, Error> {
use diesel::dsl::*;
let mut query = self.query;
// The replies
if let Some(for_recipient_id) = self.for_recipient_id {
query = query
// TODO needs lots of testing
.filter(user_alias_1::id.eq(for_recipient_id))
.filter(comment::deleted.eq(false))
.filter(comment::removed.eq(false));
}
if self.unread_only {
query = query.filter(comment::read.eq(false));
}
if let Some(for_creator_id) = self.for_creator_id {
query = query.filter(comment::creator_id.eq(for_creator_id));
};
if let Some(for_community_id) = self.for_community_id {
query = query.filter(post::community_id.eq(for_community_id));
}
if let Some(for_community_name) = self.for_community_name {
query = query
.filter(community::name.eq(for_community_name))
.filter(comment::local.eq(true));
}
if let Some(for_post_id) = self.for_post_id {
query = query.filter(comment::post_id.eq(for_post_id));
};
if let Some(search_term) = self.search_term {
query = query.filter(comment::content.ilike(fuzzy_search(&search_term)));
};
query = match self.listing_type {
// ListingType::Subscribed => query.filter(community_follower::subscribed.eq(true)),
ListingType::Subscribed => query.filter(community_follower::user_id.is_not_null()), // TODO could be this: and(community_follower::user_id.eq(user_id_join)),
ListingType::Local => query.filter(community::local.eq(true)),
_ => query,
};
if self.saved_only {
query = query.filter(comment_saved::id.is_not_null());
}
query = match self.sort {
SortType::Hot | SortType::Active => query
.order_by(hot_rank(comment_aggregates::score, comment::published).desc())
.then_order_by(comment::published.desc()),
SortType::New => query.order_by(comment::published.desc()),
SortType::TopAll => query.order_by(comment_aggregates::score.desc()),
SortType::TopYear => query
.filter(comment::published.gt(now - 1.years()))
.order_by(comment_aggregates::score.desc()),
SortType::TopMonth => query
.filter(comment::published.gt(now - 1.months()))
.order_by(comment_aggregates::score.desc()),
SortType::TopWeek => query
.filter(comment::published.gt(now - 1.weeks()))
.order_by(comment_aggregates::score.desc()),
SortType::TopDay => query
.filter(comment::published.gt(now - 1.days()))
.order_by(comment_aggregates::score.desc()),
};
let (limit, offset) = limit_and_offset(self.page, self.limit);
// Note: deleted and removed comments are done on the front side
let res = query
.limit(limit)
.offset(offset)
.load::<CommentViewTuple>(self.conn)?;
Ok(CommentView::to_vec(res))
}
}
impl ViewToVec for CommentView {
type DbTuple = CommentViewTuple;
fn to_vec(posts: Vec<Self::DbTuple>) -> Vec<Self> {
posts
.iter()
.map(|a| Self {
comment: a.0.to_owned(),
creator: a.1.to_owned(),
recipient: a.3.to_owned(),
post: a.4.to_owned(),
community: a.5.to_owned(),
counts: a.6.to_owned(),
creator_banned_from_community: a.7.is_some(),
subscribed: a.8.is_some(),
saved: a.9.is_some(),
my_vote: a.10,
})
.collect::<Vec<Self>>()
}
}