Add `Style/RedundantFreeze` to remove redudant `.freeze`

Since Rails 6.0 will support Ruby 2.4.1 or higher
`# frozen_string_literal: true` magic comment is enough to make string object frozen.
This magic comment is enabled by `Style/FrozenStringLiteralComment` cop.

* Exclude these files not to auto correct false positive `Regexp#freeze`
 - 'actionpack/lib/action_dispatch/journey/router/utils.rb'
 - 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb'

It has been fixed by https://github.com/rubocop-hq/rubocop/pull/6333
Once the newer version of RuboCop released and available at Code Climate these exclude entries should be removed.

* Replace `String#freeze` with `String#-@` manually if explicit frozen string objects are required

 - 'actionpack/test/controller/test_case_test.rb'
 - 'activemodel/test/cases/type/string_test.rb'
 - 'activesupport/lib/active_support/core_ext/string/strip.rb'
 - 'activesupport/test/core_ext/string_ext_test.rb'
 - 'railties/test/generators/actions_test.rb'

1 files changed, 3 insertions, 3 deletions

diff --git a/activerecord/lib/active_record/relation/predicate_builder.rb b/activerecord/lib/active_record/relation/predicate_builder.rb
index f734cd0ad8..b59ff912fe 100644
--- a/activerecord/lib/active_record/relation/predicate_builder.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder.rb
@@ -27,7 +27,7 @@ module ActiveRecord
           key
         else
           key = key.to_s
-          key.split(".".freeze).first if key.include?(".".freeze)
+          key.split(".").first if key.include?(".")
         end
       end.compact
     end
@@ -115,11 +115,11 @@ module ActiveRecord
 
       def convert_dot_notation_to_hash(attributes)
         dot_notation = attributes.select do |k, v|
-          k.include?(".".freeze) && !v.is_a?(Hash)
+          k.include?(".") && !v.is_a?(Hash)
         end
 
         dot_notation.each_key do |key|
-          table_name, column_name = key.split(".".freeze)
+          table_name, column_name = key.split(".")
           value = attributes.delete(key)
           attributes[table_name] ||= {}