added get authors posts route, datasource

backend/public/src/datasources/authors.rs

@@ -1,6 +1,6 @@
 use sqlx::{Pool, Postgres};
 
-use crate::routes::{authors::Author, comments::Pagination};
+use crate::routes::{authors::Author, comments::Pagination, posts::Post};
 
 pub struct AuthorsDatasource;
 impl AuthorsDatasource {
@@ -28,4 +28,17 @@ impl AuthorsDatasource {
         .fetch_one(pool)
         .await
     }
+
+    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 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",
+            author_id
+        )
+        .fetch_all(pool)
+        .await
+    }
 }