add silentmeme command

1 files changed, 21 insertions, 0 deletions

diff --git a/src/db/mod.rs b/src/db/mod.rs
index b3861d2..191b9e9 100644
--- a/src/db/mod.rs
+++ b/src/db/mod.rs
@@ -158,6 +158,27 @@ pub fn rand_audio_meme(conn: &PgConnection) -> Result<Meme> {
         .map_err(Error::from)
 }
 
+pub fn rand_silent_meme(conn: &PgConnection) -> Result<Meme> {
+    use rand::{thread_rng, seq::SliceRandom};
+    use failure::err_msg;
+    use std::ops::Try;
+
+    let ids: Vec<i32> = memes::table
+        .select(memes::id)
+        .filter(memes::audio_id.is_null())
+        .load(conn)
+        .map_err(Error::from)?;
+
+    let id = ids.choose(&mut thread_rng())
+        .into_result()
+        .map_err(|_| err_msg("couldn't load audio meme"))?;
+
+    memes::table
+        .find(id)
+        .first::<Meme>(conn)
+        .map_err(Error::from)
+}
+
 #[derive(Debug, Copy, Clone)]
 pub struct Stats {
     pub memes_overall: usize,