[rails#52698] Add TimeZoneConverter#== method, so objects will be p…

…roperly...

compared by their type, scale, limit & precision.

activerecord/CHANGELOG.md

@@ -1,3 +1,10 @@
+*   Add `TimeZoneConverter#==` method, so objects will be properly compared by
+    their type, scale, limit & precision.
+
+    Address #52699.
+
+    *Ruy Rocha*
+
 *   Add support for SQLite3 full-text-search and other virtual tables.
 
     Previously, adding sqlite3 virtual tables messed up `schema.rb`.

activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb

@@ -32,6 +32,13 @@ def cast(value)
           end
         end
 
+        def ==(other)
+          precision == other.precision &&
+            scale == other.scale &&
+            limit == other.limit &&
+            type == other.type
+        end
+
         private
           def convert_time_to_time_zone(value)
             return if value.nil?

activerecord/test/cases/attribute_methods/time_zone_converter_test.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require "cases/helper"
+require "active_support/core_ext/enumerable"
+
+module ActiveRecord
+  module AttributeMethods
+    module TimeZoneConversion
+      class TimeZoneConverterTest < ActiveRecord::TestCase
+        def test_comparison_with_date_time_type
+          subtype = ActiveRecord::Type::DateTime.new
+          value = ActiveRecord::AttributeMethods::TimeZoneConversion::TimeZoneConverter.new(subtype)
+          value_from_cache = Marshal.load(Marshal.dump(value))
+
+          assert_equal value, value_from_cache
+        end
+      end
+    end
+  end
+end