Update with rails on Jruby9.2

Rakefile

@@ -27,13 +27,7 @@ namespace :test do
   desc 'Run all tests'
   task all: TEST_METADATA.map { |k, _| "test:#{k}" }
 
-  major, minor, = if defined?(RUBY_ENGINE_VERSION)
-                    Gem::Version.new(RUBY_ENGINE_VERSION).segments
-                  else
-                    # For Ruby < 2.3
-                    Gem::Version.new(RUBY_VERSION).segments
-                  end
-
+  major, minor, = Gem::Version.new(RUBY_ENGINE_VERSION).segments
   ruby_runtime = "#{RUBY_ENGINE}-#{major}.#{minor}"
 
   TEST_METADATA.each do |key, spec_metadata|

tasks/edge.rake

@@ -7,10 +7,17 @@ require_relative 'runtime_matcher'
 namespace :edge do
   desc 'Update all the groups with gemspec dependencies'
   task :gemspec do |_t, _args|
+    major, minor, = Gem::Version.new(RUBY_ENGINE_VERSION).segments
+    ruby_runtime = "#{RUBY_ENGINE}-#{major}.#{minor}"
+
     candidates = Set.new
 
     TEST_METADATA.each do |_, metadata|
       metadata.each do |group, rubies|
+        # Exceptions:
+        # Rails 4.x is not supported on JRuby 9.2 (which is RUBY_VERSION 2.5)
+        next false if ruby_runtime == 'jruby-9.2' && group.start_with?('rails4')
+
         candidates << group if RuntimeMatcher.match?(rubies)
       end
     end