Only broadcast when the preview changes, use the _later variant for the broadcast, add tests

app/models/card/broadcastable.rb

@@ -3,5 +3,16 @@ module Card::Broadcastable
 
   included do
     broadcasts_refreshes
+
+    before_update :remember_if_preview_changed
   end
+
+  private
+    def remember_if_preview_changed
+      @preview_changed ||= title_changed? || column_id_changed? || board_id_changed?
+    end
+
+    def preview_changed?
+      @preview_changed
+    end
 end

app/models/card/pinnable.rb

@@ -4,13 +4,7 @@ module Card::Pinnable
   included do
     has_many :pins, dependent: :destroy
 
-    after_update_commit :broadcast_pin_updates
-  end
-
-  def broadcast_pin_updates
-    pins.each do |pin|
-      pin.broadcast_replace_to [ pin.user, :pins_tray ], partial: "my/pins/pin"
-    end
+    after_update_commit :broadcast_pin_updates, if: :preview_changed?
   end
 
   def pinned_by?(user)
@@ -28,4 +22,11 @@ module Card::Pinnable
   def unpin_by(user)
     pins.find_by(user: user).tap { it.destroy }
   end
+
+  private
+    def broadcast_pin_updates
+      pins.find_each do |pin|
+        pin.broadcast_replace_later_to [ pin.user, :pins_tray ], partial: "my/pins/pin"
+      end
+    end
 end

test/models/card/pinnable_test.rb

@@ -0,0 +1,40 @@
+require "test_helper"
+
+class Card::PinnableTest < ActiveSupport::TestCase
+  setup do
+    Current.session = sessions(:david)
+  end
+
+  test "broadcasts pin update when title changes" do
+    assert_broadcasted_pin_update do
+      cards(:logo).update!(title: "New title")
+    end
+  end
+
+  test "broadcasts pin update when column changes" do
+    assert_broadcasted_pin_update do
+      cards(:logo).update!(column: columns(:writebook_in_progress))
+    end
+  end
+
+  test "broadcasts pin update when board changes" do
+    assert_broadcasted_pin_update do
+      cards(:logo).update!(board: boards(:private), column: nil)
+    end
+  end
+
+  test "does not broadcast pin update when other properties change" do
+    perform_enqueued_jobs do
+      assert_turbo_stream_broadcasts([ pins(:logo_kevin).user, :pins_tray ], count: 0) do
+        cards(:logo).update!(last_active_at: Time.current)
+      end
+    end
+  end
+
+  private
+    def assert_broadcasted_pin_update(&block)
+      perform_enqueued_jobs do
+        assert_turbo_stream_broadcasts([ pins(:logo_kevin).user, :pins_tray ], &block)
+      end
+    end
+end