Add audit log entries for user roles (#19040)

* Refactor audit log schema

* Add audit log entries for user roles

app/models/admin/action_log.rb

@@ -9,38 +9,42 @@
 #  action           :string           default(""), not null
 #  target_type      :string
 #  target_id        :bigint(8)
-#  recorded_changes :text             default(""), not null
 #  created_at       :datetime         not null
 #  updated_at       :datetime         not null
+#  human_identifier :string
+#  route_param      :string
+#  permalink        :string
 #
 
 class Admin::ActionLog < ApplicationRecord
-  serialize :recorded_changes
+  self.ignored_columns = %w(
+    recorded_changes
+  )
 
   belongs_to :account
   belongs_to :target, polymorphic: true, optional: true
 
   default_scope -> { order('id desc') }
 
+  before_validation :set_human_identifier
+  before_validation :set_route_param
+  before_validation :set_permalink
+
   def action
     super.to_sym
   end
 
-  before_validation :set_changes
-
   private
 
-  def set_changes
-    case action
-    when :destroy, :create
-      self.recorded_changes = target.attributes
-    when :update, :promote, :demote
-      self.recorded_changes = target.previous_changes
-    when :change_email
-      self.recorded_changes = ActiveSupport::HashWithIndifferentAccess.new(
-        email: [target.email, nil],
-        unconfirmed_email: [nil, target.unconfirmed_email]
-      )
-    end
+  def set_human_identifier
+    self.human_identifier = target.to_log_human_identifier if target.respond_to?(:to_log_human_identifier)
+  end
+
+  def set_route_param
+    self.route_param = target.to_log_route_param if target.respond_to?(:to_log_route_param)
+  end
+
+  def set_permalink
+    self.permalink = target.to_log_permalink if target.respond_to?(:to_log_permalink)
   end
 end