backend: avoid eval for defining error classes

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/mogilefs/backend.rb b/lib/mogilefs/backend.rb
index 17f7b67..dd775ca 100644
--- a/lib/mogilefs/backend.rb
+++ b/lib/mogilefs/backend.rb
@@ -36,10 +36,10 @@ class MogileFS::Backend
   def self.add_error(err_snake)
     err_camel = err_snake.gsub(/(?:^|_)([a-z])/) { $1.upcase }
     err_camel << 'Error' unless /Error\z/ =~ err_camel
-    unless self.const_defined?(err_camel)
-      self.class_eval("class #{err_camel} < MogileFS::Error; end")
+    unless const_defined?(err_camel)
+      const_set(err_camel, Class.new(MogileFS::Error))
     end
-    BACKEND_ERRORS[err_snake] = self.const_get(err_camel)
+    BACKEND_ERRORS[err_snake] = const_get(err_camel)
   end
 
   ##