Add array support when time zone aware attributes are enabled

activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb

@@ -32,7 +32,7 @@ def define_method_attribute=(attr_name)
           if create_time_zone_conversion_attribute?(attr_name, columns_hash[attr_name])
             method_body, line = <<-EOV, __LINE__ + 1
               def #{attr_name}=(time)
-                time_with_zone = time.respond_to?(:in_time_zone) ? time.in_time_zone : nil
+                time_with_zone = convert_value_to_time_zone(time)
                 previous_time = attribute_changed?("#{attr_name}") ? changed_attributes["#{attr_name}"] : read_attribute(:#{attr_name})
                 write_attribute(:#{attr_name}, time)
                 #{attr_name}_will_change! if previous_time != time_with_zone
@@ -52,6 +52,18 @@ def create_time_zone_conversion_attribute?(name, column)
             (:datetime == column.type)
         end
       end
+
+      private
+
+      def convert_value_to_time_zone(value)
+        if value.is_a?(Array)
+          value.map { |v| convert_value_to_time_zone(v) }
+        elsif value.respond_to?(:in_time_zone)
+          value.in_time_zone
+        else
+          nil
+        end
+      end
     end
   end
 end

activerecord/test/cases/adapters/postgresql/array_test.rb

@@ -12,6 +12,7 @@ def setup
       @connection.create_table('pg_arrays') do |t|
         t.string 'tags', array: true
         t.integer 'ratings', array: true
+        t.datetime :datetimes, array: true
       end
     end
     @column = PgArray.columns_hash['tags']
@@ -195,6 +196,21 @@ def test_escaping
     assert_equal tags, ar.tags
   end
 
+  def test_datetime_with_timezone_awareness
+    with_timezone_config aware_attributes: true do
+      PgArray.reset_column_information
+      current_time = [Time.current]
+
+      record = PgArray.new(datetimes: current_time)
+      assert_equal current_time, record.datetimes
+
+      record.save!
+      record.reload
+
+      assert_equal current_time, record.datetimes
+    end
+  end
+
   private
   def assert_cycle field, array
     # test creation