* ext/psych/lib/psych/visitors/to_ruby.rb: process merge keys before

  reviving objects. Fixes GH psych #168
* test/psych/test_merge_keys.rb: test for change
  #168

Fixes #169

CHANGELOG.rdoc

@@ -1,3 +1,10 @@
+Wed Nov  6 04:14:25 2013  Aaron Patterson <aaron@tenderlovemaking.com>
+
+	* ext/psych/lib/psych/visitors/to_ruby.rb: process merge keys before
+	  reviving objects. Fixes GH psych #168
+	* test/psych/test_merge_keys.rb: test for change
+	  https://github.com/tenderlove/psych/issues/168
+
 Wed Oct 30 03:25:10 2013  Aaron Patterson <aaron@tenderlovemaking.com>
 
 	* ext/psych/lib/psych/visitors/yaml_tree.rb: make less garbage when

lib/psych/visitors/to_ruby.rb

@@ -156,7 +156,7 @@ def visit_Psych_Nodes_Mapping o
         if Psych.load_tags[o.tag]
           return revive(resolve_class(Psych.load_tags[o.tag]), o)
         end
-        return revive_hash({}, o) unless o.tag
+        return revive_hash(register(o, {}), o) unless o.tag
 
         case o.tag
         when /^!ruby\/struct:?(.*)?$/
@@ -256,7 +256,7 @@ def visit_Psych_Nodes_Mapping o
           set
 
         when /^!map:(.*)$/, /^!ruby\/hash:(.*)$/
-          revive_hash resolve_class($1).new, o
+          revive_hash register(o, resolve_class($1).new), o
 
         when '!omap', 'tag:yaml.org,2002:omap'
           map = register(o, class_loader.psych_omap.new)
@@ -266,7 +266,7 @@ def visit_Psych_Nodes_Mapping o
           map
 
         else
-          revive_hash({}, o)
+          revive_hash(register(o, {}), o)
         end
       end
 
@@ -295,8 +295,6 @@ def register_empty object
       end
 
       def revive_hash hash, o
-        @st[o.anchor] = hash if o.anchor
-
         o.children.each_slice(2) { |k,v|
           key = accept(k)
           val = accept(v)
@@ -334,10 +332,8 @@ def merge_key hash, key, val
       end
 
       def revive klass, node
-        s = klass.allocate
-        @st[node.anchor] = s if node.anchor
-        h = Hash[*node.children.map { |c| accept c }]
-        init_with(s, h, node)
+        s = register(node, klass.allocate)
+        init_with(s, revive_hash({}, node), node)
       end
 
       def init_with o, h, node

test/psych/test_merge_keys.rb

@@ -2,6 +2,24 @@
 
 module Psych
   class TestMergeKeys < TestCase
+    class Product
+      attr_reader :bar
+    end
+
+    def test_mergekey_with_object
+      s = <<-eoyml
+foo: &foo
+  bar: 10
+product:
+  !ruby/object:#{Product.name}
+  <<: *foo
+      eoyml
+      hash = Psych.load s
+      assert_equal({"bar" => 10}, hash["foo"])
+      product = hash["product"]
+      assert_equal 10, product.bar
+    end
+
     def test_merge_nil
       yaml = <<-eoyml
 defaults: &defaults