use diesel::{self, PgConnection, QueryDsl, RunQueryDsl, ExpressionMethods};

use models::{
    posts::Post,
    users::User
};
use schema::post_authors;

#[derive(Queryable, Identifiable, Associations)]
#[belongs_to(Post)]
#[belongs_to(User, foreign_key = "author_id")]
pub struct PostAuthor {
    pub id: i32,
    pub post_id: i32,
    pub author_id: i32
}

#[derive(Insertable)]
#[table_name = "post_authors"]
pub struct NewPostAuthor {
    pub post_id: i32,
    pub author_id: i32
}

impl PostAuthor {
    pub fn insert(conn: &PgConnection, new: NewPostAuthor) -> PostAuthor {
        diesel::insert_into(post_authors::table)
            .values(new)
            .get_result(conn)
            .expect("Error saving new blog author")
    }

    get!(post_authors);
}