initialze_reader and convert_value should respect subclassing by usin…

…g self.class instead of Hashie::Mash

lib/hashie/mash.rb

@@ -79,7 +79,7 @@ def []=(key,value) #:nodoc:
     # if there isn't a value already assigned to the key requested.
     def initializing_reader(key)
       ck = convert_key(key)
-      regular_writer(ck, Hashie::Mash.new) unless key?(ck)
+      regular_writer(ck, self.class.new) unless key?(ck)
       regular_reader(ck)
     end
 
@@ -141,7 +141,7 @@ def convert_key(key) #:nodoc:
 
     def convert_value(val, duping=false) #:nodoc:
       case val
-        when ::Hashie::Mash
+        when self.class
           val.dup
         when ::Hash
           val = val.dup if duping

spec/hashie/mash_spec.rb

@@ -100,6 +100,30 @@ class SubMash < Hashie::Mash
     record['submash'].should be_kind_of(SubMash)
   end
 
+  it "should respect the class when passed a bang method for a non-existent key" do
+    record = Hashie::Mash.new
+    record.non_existent!.should be_kind_of(Hashie::Mash)
+
+    class SubMash < Hashie::Mash
+    end
+
+    son = SubMash.new
+    son.non_existent!.should be_kind_of(SubMash)
+  end
+
+  it "should respect the class when converting the value" do
+    record = Hashie::Mash.new
+    record.details = Hashie::Mash.new({:email => "randy@asf.com"})
+    record.details.should be_kind_of(Hashie::Mash)
+
+    class SubMash < Hashie::Mash
+    end
+
+    son = SubMash.new
+    son.details = Hashie::Mash.new({:email => "randyjr@asf.com"})
+    son.details.should be_kind_of(SubMash)
+  end
+
   describe '#respond_to?' do
     it 'should respond to a normal method' do
       Hashie::Mash.new.should be_respond_to(:key?)