Fix RUBY-2273 Regexp::Raw cannot be deserialized from YAML (#201)

Co-authored-by: Oleg Pudeyev <[email protected]>

Author: p-mongo

lib/bson/regexp.rb

@@ -165,7 +165,13 @@ def initialize(pattern, options = '')
       #
       # @since 3.1.0
       def respond_to?(method, include_private = false)
-        compile.respond_to?(method, include_private) || super
+        if defined?(@pattern)
+          compile.respond_to?(method, include_private) || super
+        else
+          # YAML calls #respond_to? during deserialization, before the object
+          # is initialized.
+          super
+        end
       end
 
       # Encode the Raw Regexp object to BSON.

spec/bson/raw_spec.rb

@@ -580,4 +580,15 @@
       end
     end
   end
-end
+
+  describe 'yaml loading' do
+    let(:regexp) { described_class.new('hello.world', 's') }
+
+    it 'round-trips' do
+      actual = YAML.load(regexp.to_yaml)
+      actual.pattern.should == 'hello.world'
+      actual.options.should == 's'
+      actual.compile.should =~ "hello\nworld"
+    end
+  end
+end