Using action cable to send stats updates to the client and made a spectate page.

app/channels/application_cable/channel.rb

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+module ApplicationCable
+  class Channel < ActionCable::Channel::Base
+  end
+end

app/channels/application_cable/connection.rb

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+module ApplicationCable
+  class Connection < ActionCable::Connection::Base
+  end
+end

app/channels/match_channel.rb

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+class MatchChannel < ApplicationCable::Channel
+  def subscribed
+    @match = Match.find_by(id: params[:match_id])
+    Rails.logger.info "[MatchChannel] Client subscribed with match_id: #{params[:match_id]}. Match found: #{@match.present?}"
+    if @match
+      stream_for @match
+    else
+      Rails.logger.warn "[MatchChannel] Match not found for ID: #{params[:match_id]}. Subscription may fail."
+      # You might want to reject the subscription if the match isn't found
+      # reject
+    end
+  end
+
+  def unsubscribed
+    Rails.logger.info "[MatchChannel] Client unsubscribed for match #{@match&.id}"
+  end
+
+  # Called when client sends data with action: 'send_stat'
+  def send_stat(data)
+    # Explicit check for @match at the start
+    unless @match
+      Rails.logger.error "[MatchChannel] Error: send_stat called but @match is nil. Client params on sub: #{params[:match_id]}"
+      return # Stop if no match context
+    end
+
+    Rails.logger.info "[MatchChannel] Received send_stat for match #{@match.id} with data: #{data.inspect}"
+    
+    # Prepare attributes to update
+    attributes_to_update = {}
+    attributes_to_update[:w1_stat] = data['new_w1_stat'] if data.key?('new_w1_stat')
+    attributes_to_update[:w2_stat] = data['new_w2_stat'] if data.key?('new_w2_stat')
+
+    if attributes_to_update.present?
+      # Persist the changes to the database
+      # Note: Consider background job or throttling for very high frequency updates
+      begin
+        if @match.update(attributes_to_update)
+          Rails.logger.info "[MatchChannel] Updated match #{@match.id} stats in DB: #{attributes_to_update.keys.join(', ')}"
+          
+          # Prepare payload for broadcast (using potentially updated values from @match)
+          payload = {
+            w1_stat: @match.w1_stat,
+            w2_stat: @match.w2_stat
+          }.compact
+
+          if payload.present?
+            Rails.logger.info "[MatchChannel] Broadcasting DB-persisted stats to match #{@match.id} with payload: #{payload.inspect}"
+            MatchChannel.broadcast_to(@match, payload)
+          else
+            Rails.logger.info "[MatchChannel] Payload empty after DB update for match #{@match.id}, not broadcasting."
+          end
+        else
+          Rails.logger.error "[MatchChannel] Failed to update match #{@match.id} stats in DB: #{@match.errors.full_messages.join(', ')}"
+        end
+      rescue => e
+        Rails.logger.error "[MatchChannel] Exception during match update for #{@match.id}: #{e.message}"
+        Rails.logger.error e.backtrace.join("\n")
+      end
+    else
+       Rails.logger.info "[MatchChannel] No new stat data provided in send_stat for match #{@match.id}, not updating DB or broadcasting."
+    end
+  end
+end