Pass parent, name, and database to DBRef constructor when deserializing BSON

lib/mongo/cursor.rb

@@ -167,7 +167,7 @@ module XGen
           buf.put_array(@db.socket.recv(size-4).unpack("C*"), 4)
           @n_remaining -= 1
           buf.rewind
-          BSON.new.deserialize(buf)
+          BSON.new(@db).deserialize(buf)
         end
 
         def to_s

lib/mongo/util/bson.rb

@@ -46,7 +46,9 @@ class BSON
     buf.put_array(val.to_s.unpack("C*") + [0])
   end
 
-  def initialize
+  def initialize(db=nil)
+    # db is only needed during deserialization when the data contains a DBRef
+    @db = db
     @buf = ByteBuffer.new
   end
 
@@ -96,7 +98,7 @@ class BSON
     self
   end
 
-  def deserialize(buf=nil)
+  def deserialize(buf=nil, parent=nil)
     # If buf is nil, use @buf, assumed to contain already-serialized BSON.
     # This is only true during testing.
     @buf = ByteBuffer.new(buf.to_a) if buf
@@ -120,13 +122,13 @@ class BSON
         doc[key] = deserialize_oid_data(@buf)
       when ARRAY
         key = deserialize_cstr(@buf)
-        doc[key] = deserialize_array_data(@buf)
+        doc[key] = deserialize_array_data(@buf, doc)
       when REGEX
         key = deserialize_cstr(@buf)
         doc[key] = deserialize_regex_data(@buf)
       when OBJECT
         key = deserialize_cstr(@buf)
-        doc[key] = deserialize_object_data(@buf)
+        doc[key] = deserialize_object_data(@buf, doc)
       when BOOLEAN
         key = deserialize_cstr(@buf)
         doc[key] = deserialize_boolean_data(@buf)
@@ -138,7 +140,7 @@ class BSON
         doc[key] = nil
       when REF
         key = deserialize_cstr(@buf)
-        doc[key] = deserialize_dbref_data(@buf)
+        doc[key] = deserialize_dbref_data(@buf, key, parent)
       when BINARY, SYMBOL, CODE_W_SCOPE
         # TODO
         raise "unimplemented type #{type}"
@@ -183,14 +185,14 @@ class BSON
     buf.get_int
   end
 
-  def deserialize_object_data(buf)
+  def deserialize_object_data(buf, parent)
     size = buf.get_int
     buf.position -= 4
-    BSON.new.deserialize(buf.get(size))
+    BSON.new(@db).deserialize(buf.get(size), parent)
   end
 
-  def deserialize_array_data(buf)
-    h = deserialize_object_data(buf)
+  def deserialize_array_data(buf, parent)
+    h = deserialize_object_data(buf, parent)
     a = []
     h.each { |k, v| a[k.to_i] = v }
     a
@@ -216,12 +218,10 @@ class BSON
     XGen::Mongo::Driver::ObjectID.new(buf.get(12))
   end
 
-  def deserialize_dbref_data(buf)
+  def deserialize_dbref_data(buf, key, parent)
     ns = deserialize_cstr(buf)
     oid = deserialize_oid_data(buf)
-    # TODO fix parent, field_name, db of DBRef. Does that need to be done here
-    # or by the caller?
-    XGen::Mongo::Driver::DBRef.new(nil, nil, nil, ns, oid)
+    XGen::Mongo::Driver::DBRef.new(parent, key, @db, ns, oid)
   end
 
   def serialize_eoo_element(buf)

tests/test_bson.rb

@@ -8,6 +8,9 @@ class BSONTest < Test::Unit::TestCase
   include XGen::Mongo::Driver
 
   def setup
+    # We don't pass a DB to the constructor, even though we are about to test
+    # deserialization. This means that when we deserialize, any DBRefs will
+    # have nil @db ivars. That's fine for now.
     @b = BSON.new
   end
 
@@ -79,7 +82,8 @@ class BSONTest < Test::Unit::TestCase
 
   def test_dbref
     oid = ObjectID.new
-    doc = {'dbref' => DBRef.new(nil, nil, nil, 'namespace', oid)}
+    doc = {}
+    doc['dbref'] = DBRef.new(doc, 'dbref', nil, 'namespace', oid)
     @b.serialize(doc)
     doc2 = @b.deserialize
     assert_equal 'namespace', doc2['dbref'].namespace

tests/test_round_trip.rb

@@ -115,8 +115,11 @@ class RoundTripTest < Test::Unit::TestCase
         assert_equal bson.length, bson_from_ruby.length
         assert_equal bson, bson_from_ruby
 
-        # Turn those BSON bytes back into a Ruby object
-        obj_from_bson = BSON.new.deserialize(ByteBuffer.new(bson_from_ruby))
+        # Turn those BSON bytes back into a Ruby object.
+        #
+        # We're passing a nil db to the contructor here, but that's OK because
+        # the BSON bytes don't contain the db object in any case.
+        obj_from_bson = BSON.new(nil).deserialize(ByteBuffer.new(bson_from_ruby))
         assert_kind_of OrderedHash, obj_from_bson
 
         # Turn that Ruby object into BSON and compare it to the original BSON