New stats page, scoreboard, and live scores pages.

app/channels/mat_scoreboard_channel.rb

@@ -0,0 +1,15 @@
+class MatScoreboardChannel < ApplicationCable::Channel
+  def subscribed
+    @mat = Mat.find_by(id: params[:mat_id])
+    return reject unless @mat
+
+    stream_for @mat
+    transmit(scoreboard_payload(@mat))
+  end
+
+  private
+
+  def scoreboard_payload(mat)
+    mat.scoreboard_payload
+  end
+end