Add BrowserDetection model concern (#29513)

app/models/concerns/browser_detection.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+module BrowserDetection
+  extend ActiveSupport::Concern
+
+  included do
+    before_save :assign_user_agent
+  end
+
+  def detection
+    @detection ||= Browser.new(user_agent)
+  end
+
+  def browser
+    detection.id
+  end
+
+  def platform
+    detection.platform.id
+  end
+
+  private
+
+  def assign_user_agent
+    self.user_agent ||= ''
+  end
+end