Automatically install parent expiration hooks in parent_expiration_en…

…tries

lib/identity_cache/parent_model_expiration.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 module IdentityCache
-  module ParentModelExpiration # :nodoc:
+  # @api private
+  module ParentModelExpiration
     extend ActiveSupport::Concern
     include ArTransactionChanges
 
@@ -35,9 +36,16 @@ def lazy_hooks
       end
     end
 
+    module ClassMethods
+      def parent_expiration_entries
+        ParentModelExpiration.install_pending_parent_expiry_hooks(cached_model)
+        _parent_expiration_entries
+      end
+    end
+
     included do
-      class_attribute(:parent_expiration_entries)
-      self.parent_expiration_entries = Hash.new { |hash, key| hash[key] = [] }
+      class_attribute(:_parent_expiration_entries)
+      self._parent_expiration_entries = Hash.new { |hash, key| hash[key] = [] }
     end
 
     def expire_parent_caches
@@ -49,7 +57,6 @@ def expire_parent_caches
     end
 
     def add_parents_to_cache_expiry_set(parents_to_expire)
-      ParentModelExpiration.install_pending_parent_expiry_hooks(cached_model)
       self.class.parent_expiration_entries.each do |association_name, cached_associations|
         parents_to_expire_on_changes(parents_to_expire, association_name, cached_associations)
       end