[Fix rubocop#1362] Fix false positives for Rails/EnumSyntax

Fixes rubocop#1362.

This PR fixes false positives for `Rails/EnumSyntax` when using Ruby 2.7.

The warning shown in rubocop#1238 appears starting from Rails 7.2 (Requires Ruby 3.1+).
On the other hand, if users use Ruby 2.7, the warning reported in rubocop#1362 will be displayed.

Therefore, it would be appropriate to enable this cop only when analyzing Ruby 3.0+.

Nothing will happen when using Ruby 2.7 with Rails 7.0 or Rails 7.1, but the warning in rubocop#1238
will not be displayed either. Meanwhile, in Rails 7.2, which requires Ruby 3.1+, Ruby 2.7 cannot be used, so there is no issue.

changelog/fix_false_positives_for_rails_enum_syntax.md

@@ -0,0 +1 @@
+* [#1362](https://github.com/rubocop/rubocop-rails/issues/1362): Fix false positives for `Rails/EnumSyntax` when using Ruby 2.7. ([@koic][])

lib/rubocop/cop/rails/enum_syntax.rb

@@ -17,8 +17,10 @@ module Rails
       #
       class EnumSyntax < Base
         extend AutoCorrector
+        extend TargetRubyVersion
         extend TargetRailsVersion
 
+        minimum_target_ruby_version 3.0
         minimum_target_rails_version 7.0
 
         MSG = 'Enum defined with keyword arguments in `%<enum>s` enum declaration. Use positional arguments instead.'

spec/rubocop/cop/rails/enum_syntax_spec.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 RSpec.describe RuboCop::Cop::Rails::EnumSyntax, :config do
-  context 'Rails >= 7.0', :rails70 do
+  context 'Rails >= 7.0 and Ruby >= 3.0', :rails70, :ruby30 do
     context 'when keyword arguments are used' do
       context 'with %i[] syntax' do
         it 'registers an offense' do
@@ -148,6 +148,18 @@
     end
   end
 
+  context 'Rails >= 7.0 and Ruby <= 2.7', :rails70, :ruby27 do
+    context 'when keyword arguments are used' do
+      context 'with %i[] syntax' do
+        it 'does not register an offense' do
+          expect_no_offenses(<<~RUBY)
+            enum status: %i[active archived], _prefix: true
+          RUBY
+        end
+      end
+    end
+  end
+
   context 'Rails <= 6.1', :rails61 do
     context 'when keyword arguments are used' do
       context 'with %i[] syntax' do