Add a model for likes

migrations/2018-05-10-154336_create_likes/down.sql

@@ -0,0 +1,2 @@
+-- This file should undo anything in `up.sql`
+DROP TABLE likes;

migrations/2018-05-10-154336_create_likes/up.sql

@@ -0,0 +1,7 @@
+-- Your SQL goes here
+CREATE TABLE likes (
+    id SERIAL PRIMARY KEY,
+    user_id INTEGER REFERENCES users(id) ON DELETE CASCADE NOT NULL,
+    post_id INTEGER REFERENCES posts(id) ON DELETE CASCADE NOT NULL,
+    creation_date TIMESTAMP NOT NULL DEFAULT now()
+)

src/models/likes.rs

@@ -0,0 +1,29 @@
+use chrono;
+use diesel::{PgConnection, QueryDsl, RunQueryDsl, ExpressionMethods};
+
+use schema::likes;
+
+#[derive(Queryable)]
+pub struct Like {
+    id: i32,
+    user_id: i32,
+    post_id: i32,
+    creation_date: chrono::NaiveDateTime
+}
+
+#[derive(Insertable)]
+#[table_name = "likes"]
+pub struct NewLike {
+    user_id: i32,
+    post_id: i32
+}
+
+impl Like {
+     pub fn get(conn: &PgConnection, id: i32) -> Option<Like> {
+        likes::table.filter(likes::id.eq(id))
+            .limit(1)
+            .load::<Like>(conn)
+            .expect("Error loading like by ID")
+            .into_iter().nth(0)
+    }
+}

src/models/mod.rs

@@ -3,6 +3,7 @@ pub mod blogs;
 pub mod comments;
 pub mod follows;
 pub mod instance;
+pub mod likes;
 pub mod post_authors;
 pub mod posts;
 pub mod users;

src/schema.rs

@@ -56,6 +56,15 @@ table! {
     }
 }
 
+table! {
+    likes (id) {
+        id -> Int4,
+        user_id -> Int4,
+        post_id -> Int4,
+        creation_date -> Timestamp,
+    }
+}
+
 table! {
     post_authors (id) {
         id -> Int4,
@@ -102,6 +111,8 @@ joinable!(blog_authors -> users (author_id));
 joinable!(blogs -> instances (instance_id));
 joinable!(comments -> posts (post_id));
 joinable!(comments -> users (author_id));
+joinable!(likes -> posts (post_id));
+joinable!(likes -> users (user_id));
 joinable!(post_authors -> posts (post_id));
 joinable!(post_authors -> users (author_id));
 joinable!(posts -> blogs (blog_id));
@@ -113,6 +124,7 @@ allow_tables_to_appear_in_same_query!(
     comments,
     follows,
     instances,
+    likes,
     post_authors,
     posts,
     users,