Can get older conversation messages

src/helpers/conversations_helper.rs

@@ -224,6 +224,25 @@ pub fn get_new_messages(conv_id: u64, last_message_id: u64) -> ResultBoxError<Ve
         .exec(db_to_conversation_message)
 }
 
+/// Get older messages of a conversation
+///
+/// `conv_id` contains the ID of the target conversation
+/// `start_id` contains the ID from wich the research start
+/// `limit` Maximum number of messages to get
+pub fn get_older_messages(conv_id: u64, start_id: u64, limit: u64) -> ResultBoxError<Vec<ConversationMessage>> {
+    database::QueryInfo::new(CONV_MESSAGES_TABLE)
+        .cond_u64("conv_id", conv_id)
+        .set_custom_where("ID <= ?")
+        .add_custom_where_argument_u64(start_id)
+        .set_order("id DESC")
+        .set_limit(limit)
+        .exec(db_to_conversation_message)
+        .map(|mut l| {
+            l.sort_by(|a, b| a.id.partial_cmp(&b.id).unwrap());
+            l
+        })
+}
+
 /// Send a new conversation message
 pub fn send_message(msg: &NewConversationMessage) -> ResultBoxError<()> {
     let t = time();