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fix(blog::api) fix pagination for GET posts

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lumither committed 2025-10-11 11:51:06 -04:00
1 parent b1a55c363f
commit 314f5780fd
3 files changed
+51 -25
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backend/server/src/modules/blog/api/posts/count_tag_filtered_posts.sql
+20
View File
@@ -0,0 +1,20 @@
WITH filtered_posts AS
(SELECT p.id, p.date_created
FROM posts p
WHERE $1::text[] IS NULL
OR (
CASE
WHEN $4 THEN (SELECT COUNT(DISTINCT t.name)
FROM post_tag pt
JOIN tags t ON pt.tag = t.id
WHERE pt.post = p.id
AND t.name = ANY ($1::text[])) = cardinality($1)
ELSE EXISTS (SELECT 1
FROM post_tag pt
JOIN tags t ON pt.tag = t.id
WHERE pt.post = p.id
AND t.name = ANY ($1::text[]))
END
))
SELECT COUNT(*) AS total_count
FROM filtered_posts;
backend/server/src/modules/blog/api/posts/get.rs
+10 -5
View File
@@ -106,20 +106,25 @@ struct UuidRow {
id: Uuid,
}
const GET_POST_WITH_BRIEF_MODEL: &str = include_str!("get_post_with_brief_model.sql");
const I32_PLACEHOLDER: i32 = 0;
const COUNT_TAG_FILTERED_POSTS: &str = include_str!("count_tag_filtered_posts.sql");
const SELECT_POST_WITH_TAG_FILTER_PAGINATED: &str =
include_str!("select_post_with_tag_filter_paginated.sql");
const GET_POST_WITH_BRIEF_MODEL: &str = include_str!("get_post_with_brief_model.sql");
pub async fn handler(
State(db): State<PgPool>,
Query(search_params): Query<SearchParams>,
) -> impl IntoResponse {
dbg!(&search_params.tags);
dbg!(&search_params.match_all);
let page = search_params.page.unwrap_or(1);
let page_size = search_params.page_size.unwrap_or(PAGE_SIZE);
let page_count = match sqlx::query_scalar::<_, i64>("SELECT COUNT(*) FROM posts")
let page_count = match sqlx::query_scalar::<_, i64>(COUNT_TAG_FILTERED_POSTS)
.bind(&search_params.tags)
.bind(I32_PLACEHOLDER) // not used, but help sqlx/psql hit cache
.bind(I32_PLACEHOLDER)
.bind(search_params.match_all)
.fetch_one(&db)
.await
{
backend/server/src/modules/blog/api/posts/select_post_with_tag_filter_paginated.sql
+21 -20
View File
@@ -1,21 +1,22 @@
SELECT p.id
FROM posts p
WHERE $1::text[] IS NULL
OR (
CASE
WHEN $4 THEN (SELECT COUNT(DISTINCT t.name)
FROM post_tag pt
JOIN tags t ON pt.tag = t.id
WHERE pt.post = p.id
AND t.name = ANY ($1::text[]))
= cardinality($1)
ELSE
EXISTS (SELECT 1
FROM post_tag pt
JOIN tags t ON pt.tag = t.id
WHERE pt.post = p.id
AND t.name = ANY ($1::text[]))
END
)
ORDER BY p.date_created DESC
WITH filtered_posts AS
(SELECT p.id, p.date_created
FROM posts p
WHERE $1::text[] IS NULL
OR (
CASE
WHEN $4 THEN (SELECT COUNT(DISTINCT t.name)
FROM post_tag pt
JOIN tags t ON pt.tag = t.id
WHERE pt.post = p.id
AND t.name = ANY ($1::text[])) = cardinality($1)
ELSE EXISTS (SELECT 1
FROM post_tag pt
JOIN tags t ON pt.tag = t.id
WHERE pt.post = p.id
AND t.name = ANY ($1::text[]))
END
))
SELECT id
FROM filtered_posts
ORDER BY date_created DESC
LIMIT $2 OFFSET $3;