Messages: Allow multiple attachments. (⚠️ breaking change)

src/routes/channels/message_send.rs

@@ -58,8 +58,8 @@ pub async fn req(user: User, target: Ref, message: Json<Data>) -> Result<JsonVal
     }
 
     let id = Ulid::new().to_string();
-    let attachment = if let Some(attachment_id) = &message.attachment {
-        Some(File::find_and_use(attachment_id, "attachments", "message", &id).await?)
+    let attachments = if let Some(attachment_id) = &message.attachment {
+        Some(vec![ File::find_and_use(attachment_id, "attachments", "message", &id).await? ])
     } else {
         None
     };
@@ -70,7 +70,7 @@ pub async fn req(user: User, target: Ref, message: Json<Data>) -> Result<JsonVal
         author: user.id,
 
         content: Content::Text(message.content.clone()),
-        attachment,
+        attachments,
         nonce: Some(message.nonce.clone()),
         edited: None,
         embeds: None,