[Fix rubocop#12823] Fix uninitialized constant error

Fixes the broken reference to `Bundler` on line 66
amomchilov · Apr 9, 2024 · 17624d9 · 17624d9
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diff --git a/changelog/fix_uninitialized_constant_bundler.md b/changelog/fix_uninitialized_constant_bundler.md
@@ -0,0 +1 @@
+* [#12823](https://github.com/rubocop/rubocop/issues/12823): Fixed "uninitialized constant `RuboCop::Lockfile::Bundler`", caused when running RuboCop without `bundler exec` on codebases that use `rubocop-rails`. ([@amomchilov][])
diff --git a/lib/rubocop/lockfile.rb b/lib/rubocop/lockfile.rb
@@ -59,12 +59,15 @@ def includes_gem?(name)
     # @return [Bundler::LockfileParser, nil]
     def parser
       return @parser if defined?(@parser)
-      return unless @lockfile_path
 
-      lockfile = Bundler.read_file(@lockfile_path)
-      @parser = lockfile ? Bundler::LockfileParser.new(lockfile) : nil
-    rescue Bundler::BundlerError
-      nil
+      @parser = if defined?(::Bundler) && @lockfile_path
+                  begin
+                    lockfile = ::Bundler.read_file(@lockfile_path)
+                    lockfile ? ::Bundler::LockfileParser.new(lockfile) : nil
+                  rescue ::Bundler::BundlerError
+                    nil
+                  end
+                end
     end
   end
 end