my-website-v2/backend/public/src/datasources/authors.rs

use sqlx::{Pool, Postgres};

use crate::routes::{authors::Author, comments::Pagination, posts::Post};

pub struct 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
    }

    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
    }
}