Get all reaction users in one request

2 files changed, 15 insertions, 2 deletions

diff --git a/slack/slack_conversation.py b/slack/slack_conversation.py
index 2d6fc3b..97fd85b 100644
--- a/slack/slack_conversation.py
+++ b/slack/slack_conversation.py
@@ -313,7 +313,17 @@ class SlackConversation(SlackBuffer):
             ]
 
             sender_user_ids = [m.sender_user_id for m in messages if m.sender_user_id]
-            self.workspace.users.initialize_items(sender_user_ids)
+            if self.display_reaction_nicks():
+                reaction_user_ids = [
+                    user_id
+                    for m in messages
+                    for reaction in m.reactions
+                    for user_id in reaction["users"]
+                ]
+                user_ids = sender_user_ids + reaction_user_ids
+            else:
+                user_ids = sender_user_ids
+            self.workspace.users.initialize_items(user_ids)
 
             sender_bot_ids = [
                 m.sender_bot_id
diff --git a/slack/slack_message.py b/slack/slack_message.py
index 0771b60..36faa5f 100644
--- a/slack/slack_message.py
+++ b/slack/slack_message.py
@@ -217,6 +217,10 @@ class SlackMessage:
             return await self.workspace.bots[self._message_json["bot_id"]]
 
     @property
+    def reactions(self) -> List[SlackMessageReaction]:
+        return self._message_json.get("reactions", [])
+
+    @property
     def priority(self) -> MessagePriority:
         return MessagePriority.MESSAGE
 
@@ -603,7 +607,6 @@ class SlackMessage:
 
     async def _create_reaction_string(self, reaction: SlackMessageReaction) -> str:
         if self.conversation.display_reaction_nicks():
-            # TODO: initialize_items?
             users = await gather(
                 *(self.workspace.users[user_id] for user_id in reaction["users"])
             )