delete posts

members/diesel-demo/src/main.rs

@@ -56,6 +56,13 @@ fn repl(conn: &mut SqliteConnection) -> anyhow::Result<()> {
                 Some(i) => i,
                 None => continue,
             };
+            if let Err(e) = Post::delete(conn, id){
+                if let Some(e) = e.downcast_ref::<diesel::result::Error>() {
+                    if matches!(e, diesel::result::Error::NotFound) {
+                        warn!("No post with id {id} exists");
+                    }
+                }
+            };
         } else if buf.starts_with("LIST") {
             let posts = lib::load_all_posts(conn)?;
             trace!("loaded posts for display: {posts:#?}");

members/diesel-demo/src/models.rs

@@ -32,6 +32,15 @@ impl Post {
         info!("updated post {}", post.id);
         Ok(())
     }
+    pub fn delete(conn: &mut SqliteConnection, id: i32) -> anyhow::Result<()> {
+        use crate::schema::posts::dsl::{posts, published};
+
+        let post = diesel::delete(posts.find(id))
+            .returning(Post::as_returning())
+            .get_result(conn)?;
+        info!("deleted post {}", post.id);
+        Ok(())
+    }
 }
 
 #[derive(Insertable, Debug)]