finished tut

src/bin/delete_post.rs

@@ -0,0 +1,17 @@
+use diesel::prelude::*;
+use diesel_demo::*;
+use std::env::args;
+
+fn main() {
+    use self::schema::posts::dsl::*;
+
+    let target = args().nth(1).expect("Expected a target to match against");
+    let pattern = format!("%{}%", target);
+
+    let connection = &mut establish_connection();
+    let num_deleted = diesel::delete(posts.filter(title.like(pattern)))
+        .execute(connection)
+        .expect("Error deleting posts");
+
+    println!("Deleted {} posts", num_deleted);
+}

src/bin/get_post.rs

@@ -0,0 +1,28 @@
+use self::models::Post;
+use diesel::{connection, prelude::*};
+use diesel_demo::*;
+use std::env::args;
+
+fn main() {
+    use self::schema::posts::dsl::posts;
+
+    let post_id = args()
+    .nth(1)
+    .expect("get_post requires a post id")
+    .parse::<i32>()
+    .expect("Invalid Id");
+
+    let connection = &mut establish_connection();
+
+    let post = posts
+    .find(post_id)
+    .select(Post::as_select())
+    .first(connection)
+    .optional();
+
+    match post {
+        Ok(Some(post)) => println!("Post with id: {} has a title: {}", post.id, post.title),
+        Ok(None) => println!("Unable to find post {}", post_id),
+        Err(_) => println!("An error occured while fetching post {}", post_id),
+    }
+}

src/bin/publish_post.rs

@@ -0,0 +1,22 @@
+use self::models::Post;
+use diesel::{connection, prelude::*};
+use diesel_demo::*;
+use std::env::args;
+
+fn main() {
+    use self::schema::posts::dsl::{posts, published};
+
+    let id = args()
+    .nth(1).expect("publish_post requires a post id").parse::<i32>()
+    .expect("Invalid ID");
+    
+    let connection = &mut establish_connection();
+
+    let post = diesel::update(posts.find(id))
+    .set(published.eq(true))
+    .returning(Post::as_returning())
+    .get_result(connection)
+    .unwrap();
+
+    println!("Published post {}", post.title);
+}

src/bin/write_post.rs

@@ -0,0 +1,25 @@
+use diesel_demo::*;
+use std::io::{stdin, Read};
+
+fn main() {
+    let connection = &mut establish_connection();
+
+    let mut title = String::new();
+    let mut body = String::new();
+
+    println!("What would you like your title to be?");
+    stdin().read_line(&mut title).unwrap();
+    let title = title.trim_end(); // Remove the trailing newline
+
+    println!("\nOk! Let's write {title} (Press {EOF} when finished)\n",);
+    stdin().read_to_string(&mut body).unwrap();
+
+    let post = create_post(connection, title, &body);
+    println!("\nSaved draft {title} with id {}", post.id);
+}
+
+#[cfg(not(windows))]
+const EOF: &str = "CTRL+D";
+
+#[cfg(windows)]
+const EOF: &str = "CTRL+Z";

src/lib.rs

@@ -13,3 +13,17 @@ pub fn establish_connection() -> PgConnection {
         |_| panic!("Error connecting to {}", database_url)
     )
 }
+
+use self::models::{NewPost, Post};
+
+pub fn create_post(conn: &mut PgConnection, title: &str, body: &str) -> Post {
+    use crate::schema::posts;
+
+    let new_post = NewPost {title, body};
+
+    diesel::insert_into(posts::table)
+    .values(&new_post)
+    .returning(Post::as_returning())
+    .get_result(conn)
+    .expect("Error saving new post")
+}

src/models.rs

@@ -9,3 +9,12 @@ pub struct Post {
     pub body: String,
     pub published: bool,
 }
+
+use crate::schema::posts;
+
+#[derive(Insertable)]
+#[diesel(table_name = posts)]
+pub struct NewPost<'a> {
+    pub title: &'a str,
+    pub body: &'a str,
+}