added pagination to a given authors page

backend/public/src/datasources/authors.rs

@@ -1,6 +1,9 @@
 use sqlx::{Pool, Postgres};
 
-use crate::routes::{authors::Author, comments::Pagination, posts::Post};
+use crate::{
+    routes::{authors::Author, posts::Post},
+    utils::pagination::Pagination,
+};
 
 pub struct AuthorsDatasource;
 impl AuthorsDatasource {
@@ -8,11 +11,11 @@ impl AuthorsDatasource {
         pool: &Pool<Postgres>,
         pagination: Pagination,
     ) -> Result<Vec<Author>, sqlx::Error> {
-        let offset: i64 = (pagination.page_number - 1) * pagination.page_size;
+        let offset: i64 = (pagination.page - 1) * pagination.limit;
         sqlx::query_as!(
             Author,
             "SELECT author_id, first_name, last_name, bio, image FROM authors ORDER BY created_at DESC LIMIT $1 OFFSET $2",
-            pagination.page_size,
+            pagination.page,
             offset,
         )
         .fetch_all(pool)
@@ -32,13 +35,32 @@ impl AuthorsDatasource {
     pub async fn get_authors_posts(
         pool: &Pool<Postgres>,
         author_id: i32,
-    ) -> Result<Vec<Post>, sqlx::Error> {
-        sqlx::query_as!(
-            Post,
-            "SELECT p.post_id, a.first_name, a.last_name, p.title, p.body, p.created_at, a.author_id FROM posts p LEFT JOIN authors a ON a.author_id = p.author_id WHERE p.deleted_at IS NULL AND p.author_id = $1 ORDER BY created_at DESC",
+        pagination: Pagination,
+    ) -> Result<(Vec<Post>, i64), sqlx::Error> {
+        let offset: i64 = (pagination.page - 1) * pagination.limit;
+        println!(
+            "Author ID: {}, Page: {}, Size: {}, Offset: {}",
+            author_id, pagination.page, pagination.limit, offset
+        );
+
+        let total_count = sqlx::query_scalar!(
+            "SELECT COUNT(*) FROM posts p WHERE p.deleted_at IS NULL AND p.author_id = $1",
             author_id
         )
+        .fetch_one(pool)
+        .await?
+        .unwrap_or(0);
+
+        let posts_query = sqlx::query_as!(
+            Post,
+            "SELECT p.post_id, a.first_name, a.last_name, p.title, p.body, p.created_at, a.author_id FROM posts p LEFT JOIN authors a ON a.author_id = p.author_id WHERE p.deleted_at IS NULL AND p.author_id = $1 ORDER BY created_at DESC LIMIT $2 OFFSET $3",
+            author_id,
+            pagination.limit,
+            offset,
+        )
         .fetch_all(pool)
-        .await
+        .await?;
+
+        Ok((posts_query, total_count))
     }
 }