Support sending reminders to threads

migrations/20240303125837_add_indexes.sql

@@ -0,0 +1,5 @@
+-- Add migration script here
+ALTER TABLE reminders
+    ADD INDEX `utc_time_index` (`utc_time`);
+ALTER TABLE reminders
+    ADD INDEX `status_index` (`status`);

postman/src/sender.rs

@@ -232,6 +232,7 @@ pub struct Reminder {
     id: u32,
 
     channel_id: u64,
+    thread_id: Option<u64>,
     webhook_id: Option<u64>,
     webhook_token: Option<String>,
 
@@ -266,6 +267,7 @@ SELECT
                 reminders.`id` AS id,
 
                 channels.`channel` AS channel_id,
+                reminders.`thread_id` AS thread_id,
                 channels.`webhook_id` AS webhook_id,
                 channels.`webhook_token` AS webhook_token,
 
@@ -337,7 +339,9 @@ WHERE
 
     async fn reset_webhook(&self, pool: impl Executor<'_, Database = Database> + Copy) {
         let _ = sqlx::query!(
-            "UPDATE channels SET webhook_id = NULL, webhook_token = NULL WHERE channel = ?",
+            "
+            UPDATE channels SET webhook_id = NULL, webhook_token = NULL WHERE channel = ?
+            ",
             self.channel_id
         )
         .execute(pool)
@@ -473,7 +477,11 @@ WHERE
             reminder: &Reminder,
             embed: Option<CreateEmbed>,
         ) -> Result<()> {
-            let channel = ChannelId::new(reminder.channel_id).to_channel(&cache_http).await;
+            let channel = if let Some(thread_id) = reminder.thread_id {
+                ChannelId::new(thread_id).to_channel(&cache_http).await
+            } else {
+                ChannelId::new(reminder.channel_id).to_channel(&cache_http).await
+            };
 
             let mut message = CreateMessage::new().content(&reminder.content).tts(reminder.tts);
 
@@ -524,7 +532,14 @@ WHERE
             webhook: Webhook,
             embed: Option<CreateEmbed>,
         ) -> Result<()> {
-            let mut builder = ExecuteWebhook::new().content(&reminder.content).tts(reminder.tts);
+            let mut builder = if let Some(thread_id) = reminder.thread_id {
+                ExecuteWebhook::new()
+                    .content(&reminder.content)
+                    .tts(reminder.tts)
+                    .in_thread(thread_id)
+            } else {
+                ExecuteWebhook::new().content(&reminder.content).tts(reminder.tts)
+            };
 
             if let Some(username) = &reminder.username {
                 if !username.is_empty() {
@@ -571,7 +586,9 @@ WHERE
                     .map_or(true, |inner| inner >= Utc::now().naive_local()))
         {
             let _ = sqlx::query!(
-                "UPDATE `channels` SET paused = 0, paused_until = NULL WHERE `channel` = ?",
+                "
+                UPDATE `channels` SET paused = 0, paused_until = NULL WHERE `channel` = ?
+                ",
                 self.channel_id
             )
             .execute(pool)

src/models/reminder/mod.rs

@@ -13,7 +13,7 @@ use chrono_tz::Tz;
 use poise::{
     serenity_prelude::{
         model::id::{ChannelId, GuildId, UserId},
-        ButtonStyle, Cache, CreateActionRow, CreateButton, CreateEmbed, ReactionType,
+        ButtonStyle, Cache, ChannelType, CreateActionRow, CreateButton, CreateEmbed, ReactionType,
     },
     CreateReply,
 };
@@ -482,12 +482,23 @@ pub async fn create_reminder(
                 let list = channels.map(|arg| parse_mention_list(&arg)).unwrap_or_default();
 
                 if list.is_empty() {
-                    if ctx.guild_id().is_some() {
+                    if let Some(channel) = ctx.guild_channel().await {
+                        if channel.kind == ChannelType::PublicThread
+                            || channel.kind == ChannelType::PrivateThread
+                        {
+                            let parent = channel.parent_id.unwrap();
+                            let channel_with_threads = ChannelWithThread {
+                                channel_id: parent.get(),
+                                thread_id: Some(ctx.channel_id().get()),
+                            };
+                            vec![ReminderScope::Channel(channel_with_threads)]
+                        } else {
                             let channel_with_threads = ChannelWithThread {
                                 channel_id: ctx.channel_id().get(),
                                 thread_id: None,
                             };
                             vec![ReminderScope::Channel(channel_with_threads)]
+                        }
                     } else {
                         vec![ReminderScope::User(ctx.author().id.get())]
                     }