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feat(blog) add adj (adjacent posts) to get_post

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lumither committed 2024-07-25 00:37:10 +08:00
1 parent 91ad20215a
commit dbe84bc9f4
2 files changed
+76 -4
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backend/src/api/get/get_post.rs
+44 -2
View File
@@ -102,11 +102,53 @@ WHERE post_id = $1;
}
};
// todo: next, prev post
let adjacent = match query(r"
WITH target_post AS (SELECT t.date FROM meta t WHERE post_id = $1),
prev AS (SELECT post_id, t.title, t.sub_title, t.header_img
FROM meta t
WHERE t.date < (SELECT date FROM target_post)
ORDER BY t.date DESC
LIMIT 1),
next AS (SELECT post_id, t.title, t.sub_title, t.header_img
FROM meta t
WHERE t.date > (SELECT date FROM target_post)
ORDER BY t.date
LIMIT 1)
SELECT json_strip_nulls(json_build_object(
'prev',
(SELECT json_build_object('id', post_id, 'title', title, 'sub_title', sub_title, 'header_img', header_img)
FROM prev),
'next',
(SELECT json_build_object('id', post_id, 'title', title, 'sub_title', sub_title, 'header_img', header_img)
FROM next)
)) AS result;
"
)
.bind(post_id)
.fetch_one(&db_connection)
.await
{
Ok(res) => {res.get::<Value, _>("result")}
Err(e) => {
error!(
"Database error on Reading `{}` from table `{}`: <{}>: {}",
"adjoint posts data",
"meta",
post_id.to_string(),
e.to_string()
);
return Err((
StatusCode::INTERNAL_SERVER_ERROR,
Json::from(json!({"error": e.to_string()})),
));
}
};
let mut res = post.as_object().unwrap().to_owned();
res.insert("tags".to_string(), tags.into());
res.insert("meta".to_string(), meta.into());
res.insert("meta".to_string(), meta);
res.insert("adj".to_string(), adjacent);
Ok(Json::from(json!(res)))
}
backend/src/model/blog/meta.sql
+32 -2
View File
@@ -8,8 +8,8 @@ DROP table meta;
DO
$$
DECLARE
_post_id UUID := 'd5a209d4-93b1-474e-8e4e-9c78d6e6e763'; -- test data
_meta_cols JSONB := '{"title": " title", "tags": "example tags", "new_col1": "new_value1", "new_col3": "new_value2"}'; -- test data
_post_id UUID := '{}';
_meta_cols JSONB := '{}';
_exists BOOLEAN;
_col_name TEXT;
_col_value TEXT;
@@ -17,11 +17,16 @@ $$
_insert_columns TEXT := 'post_id';
_insert_values TEXT := quote_literal(_post_id);
_update_set TEXT := '';
_blacklist TEXT[] := ARRAY ['id', 'tags'];
BEGIN
SELECT EXISTS(SELECT 1 FROM meta WHERE post_id = _post_id) INTO _exists;
FOR _col_name, _col_value IN SELECT key, value FROM jsonb_each_text(_meta_cols)
LOOP
IF _col_name = ANY (_blacklist) THEN
CONTINUE;
END IF;
IF NOT EXISTS (SELECT 1
FROM information_schema.columns
WHERE table_name = 'meta'
@@ -47,3 +52,28 @@ $$
END IF;
END;
$$ LANGUAGE plpgsql;
SELECT jsonb_strip_nulls(to_jsonb(t)) AS meta
FROM meta t
WHERE post_id = '8ca3fa2b-f040-448c-8885-81aab56db9bb';
WITH target_post AS (SELECT t.date FROM meta t WHERE post_id = '8ca3fa2b-f040-448c-8885-81aab56db9bb'),
prev AS (SELECT post_id, t.title, t.sub_title, t.header_img
FROM meta t
WHERE t.date < (SELECT date FROM target_post)
ORDER BY t.date DESC
LIMIT 1),
next AS (SELECT post_id, t.title, t.sub_title, t.header_img
FROM meta t
WHERE t.date > (SELECT date FROM target_post)
ORDER BY t.date
LIMIT 1)
SELECT json_strip_nulls(json_build_object(
'prev',
(SELECT json_build_object('id', post_id, 'title', title, 'sub_title', sub_title, 'header_img', header_img)
FROM prev),
'next',
(SELECT json_build_object('id', post_id, 'title', title, 'sub_title', sub_title, 'header_img', header_img)
FROM next)
)) AS result;