[Untested] Add expire_cache_for_{insert,update,delete} methods

lib/identity_cache/cached/attribute.rb

@@ -47,6 +47,20 @@ def expire_for_save(record)
         end
       end
 
+      def expire_for_values(values_hash)
+        key_values = key_fields.map { |name| values_hash.fetch(name) }
+        IdentityCache.cache.delete(cache_key_from_key_values(key_values))
+      end
+
+      def expire_for_update(old_values_hash, changes)
+        expire_for_values(old_values_hash)
+
+        if key_fields.any? { |name| changes.key?(name) }
+          key_values = key_fields.map { |name| changes.fetch(name) { old_values_hash.fetch(name) } }
+          IdentityCache.cache.delete(cache_key_from_key_values(key_values))
+        end
+      end
+
       def cache_key(index_key)
         values_hash = IdentityCache.memcache_hash(unhashed_values_cache_key_string(index_key))
         "#{model.rails_cache_key_namespace}#{cache_key_prefix}#{values_hash}"

lib/identity_cache/configuration_dsl.rb

@@ -129,6 +129,7 @@ def cache_attribute_by_alias(attribute_or_proc, alias_name:, by:, unique:)
         cached_attribute = klass.new(self, attribute_or_proc, alias_name, fields, unique)
         cached_attribute.build
         cache_indexes.push(cached_attribute)
+        @cache_indexed_columns = nil
       end
 
       def ensure_base_model

lib/identity_cache/parent_model_expiration.rb

@@ -41,6 +41,17 @@ def parent_expiration_entries
         ParentModelExpiration.install_pending_parent_expiry_hooks(cached_model)
         _parent_expiration_entries
       end
+
+      def check_for_unsupported_parent_expiration_entries
+        return unless parent_expiration_entries.any?
+        msg = +"Unsupported manual expiration of #{name} record that is embedded in parent associations:\n"
+        parent_expiration_entries.each do |association_name, cached_associations|
+          cached_associations.each do |parent_class, _only_on_foreign_key_change|
+            msg << "- #{association_name}"
+          end
+        end
+        raise msg
+      end
     end
 
     included do

lib/identity_cache/without_primary_index.rb

@@ -26,6 +26,55 @@ module ClassMethods
       def primary_cache_index_enabled
         false
       end
+
+      # Get only the columns whose values are needed to manually expire caches
+      # after updating or deleting rows without triggering after_commit callbacks.
+      #
+      # 1. Pass the returned columns into Active Record's `select` or `pluck` query
+      #    method on the scope that will be used to modify the database in order to
+      #    query original for these rows that will be modified.
+      # 2. Update or delete the rows
+      # 3. Use {expire_cache_for_update} or {expire_cache_for_delete} to expires the
+      #    caches, passing in the values from the query in step 1 as the indexed_values.
+      #
+      # @return [Array<Symbol>] the array of column names
+      def cache_indexed_columns
+        @cache_indexed_columns ||= begin
+          check_for_unsupported_parent_expiration_entries
+          columns = Set.new
+          columns << primary_key.to_sym if primary_cache_index_enabled
+          cache_indexes.each do |cached_attribute|
+            columns.merge(cached_attribute.key_fields)
+          end
+          columns.to_a.freeze
+        end
+      end
+
+      def expire_cache_for_update(old_indexed_values, changes)
+        if primary_cache_index_enabled
+          id = old_indexed_values.fetch(primary_key.to_sym)
+          expire_primary_key_cache_index(id)
+        end
+        cache_indexes.each do |cached_attribute|
+          cached_attribute.expire_for_update(old_indexed_values, changes)
+        end
+        check_for_unsupported_parent_expiration_entries
+      end
+
+      private def expire_cache_for_insert_or_delete(indexed_values)
+        if primary_cache_index_enabled
+          id = indexed_values.fetch(primary_key.to_sym)
+          expire_primary_key_cache_index(id)
+        end
+        cache_indexes.each do |cached_attribute|
+          cached_attribute.expire_for_values(indexed_values)
+        end
+        check_for_unsupported_parent_expiration_entries
+      end
+
+      alias_method :expire_cache_for_insert, :expire_cache_for_insert_or_delete
+
+      alias_method :expire_cache_for_delete, :expire_cache_for_insert_or_delete
     end
   end
 end