Improve logic when Rails class/module is defined but Rails (rails gem) is not present

CHANGELOG.md

@@ -3,6 +3,10 @@ Airbrake Changelog
 
 ### master
 
+### [][] ()
+
+* Added Def class to improve on recognising Rails gem presence vs Rails class.
+
 ### [v13.0.3][v13.0.3] (September 20, 2022)
 
 * Fixed `tie_rails_4_or_below_with_active_record': uninitialized constant

lib/airbrake.rb

@@ -8,12 +8,13 @@
 require 'airbrake-ruby'
 
 require 'airbrake/version'
+require 'airbrake/def'
 
 # Automatically load needed files for the environment the library is running in.
 if defined?(Rack)
   require 'airbrake/rack'
 
-  require 'airbrake/rails' if defined?(Rails)
+  require 'airbrake/rails' if Airbrake::Def.rails?
 end
 
 require 'airbrake/rake' if defined?(Rake::Task)

lib/airbrake/def.rb

@@ -0,0 +1,7 @@
+module Airbrake
+  class Def
+    def self.rails?
+      defined?(Rails) && defined?(Rails.version)
+    end
+  end
+end

lib/airbrake/rack/route_filter.rb

@@ -17,7 +17,7 @@ def call(notice)
         return unless (request = notice.stash[:rack_request])
 
         notice[:context][:route] =
-          if action_dispatch_request?(request)
+          if action_dispatch_request?(request) && Def.rails?
             rails_route(request)
           elsif sinatra_request?(request)
             sinatra_route(request)

lib/airbrake/rails/backtrace_cleaner.rb

@@ -14,7 +14,7 @@ def self.clean(backtrace)
   end
 end
 
-if defined?(Rails)
+if Airbrake::Def.rails?
   # Silence own frames to let the cleaner proceed to the next line (and probably
   # find the correct call-site coming from the app code rather this library).
   Rails.backtrace_cleaner.add_silencer do |line|

lib/airbrake/rake/tasks.rb

@@ -4,7 +4,7 @@
 
 namespace :airbrake do
   desc 'Verify your gem installation by sending a test exception'
-  task test: (:environment if defined?(Rails)) do
+  task test: (:environment if Airbrake::Def.rails?) do
     raise Airbrake::Error, 'airbrake-ruby is not configured' unless Airbrake.configured?
 
     require 'pp'
@@ -38,7 +38,7 @@
 
   desc 'Notify Airbrake of a new deploy'
   task :deploy do
-    if defined?(Rails)
+    if Airbrake::Def.rails?
       initializer = Rails.root.join('config', 'initializers', 'airbrake.rb')
 
       # Avoid loading the environment to speed up the deploy task and try guess