added comment index pagination, added author routes

backend/public/src/datasources/authors.rs

@@ -1,2 +1,31 @@
+use sqlx::{Pool, Postgres};
+
+use crate::routes::{authors::Author, comments::Pagination};
+
 pub struct AuthorsDatasource;
-impl AuthorsDatasource {}
+impl AuthorsDatasource {
+    pub async fn get_all(
+        pool: &Pool<Postgres>,
+        pagination: Pagination,
+    ) -> Result<Vec<Author>, sqlx::Error> {
+        let offset: i64 = (pagination.page_number - 1) * pagination.page_size;
+        sqlx::query_as!(
+            Author,
+            "SELECT author_id, first_name, last_name, bio FROM authors ORDER BY created_at DESC LIMIT $1 OFFSET $2",
+            pagination.page_size,
+            offset,
+        )
+        .fetch_all(pool)
+        .await
+    }
+
+    pub async fn get_one(pool: &Pool<Postgres>, author_id: i32) -> Result<Author, sqlx::Error> {
+        sqlx::query_as!(
+            Author,
+            "SELECT author_id, first_name, last_name, bio FROM authors WHERE author_id = $1",
+            author_id
+        )
+        .fetch_one(pool)
+        .await
+    }
+}