added Collection#stats and DB#stats

HISTORY

@@ -1,4 +1,9 @@
 0.20
+
+* Support for new commands:
+  * Collection#find_and_modify
+  * Collection#stats
+  * DB#stats
 * Exception class adjustments:
   * Mongo::InvalidObjectID moved to BSON::InvalidObjectID
   * Mongo::InvalidDocument moved to BSON::InvalidDocument

lib/mongo/collection.rb

@@ -608,6 +608,13 @@ module Mongo
       @db.collections_info(@name).next_document['options']
     end
 
+    # Return stats on the collection. Uses MongoDB's collstats command.
+    #
+    # @return [Hash]
+    def stats
+      @db.command({:collstats => @name})
+    end
+
     # Get the number of documents in this collection.
     #
     # @return [Integer]

lib/mongo/db.rb

@@ -386,6 +386,14 @@ module Mongo
       info
     end
 
+
+    # Return stats on this database. Uses MongoDB's dbstats command.
+    #
+    # @return [Hash]
+    def stats
+      self.command({:dbstats => 1})
+    end
+
     # Create a new index on the given collection.
     # Normally called by Collection#create_index.
     #

test/collection_test.rb

@@ -399,6 +399,15 @@ class TestCollection < Test::Unit::TestCase
     end
   end
 
+  if @@version >= "1.3.5"
+    def test_coll_stats
+      @@test << {:n => 1}
+      @@test.create_index("n")
+
+      assert_equal "#{MONGO_TEST_DB}.test", @@test.stats['ns']
+    end
+  end
+
   def test_saving_dates_pre_epoch
     begin
       @@test.save({'date' => Time.utc(1600)})

test/db_test.rb

@@ -20,6 +20,7 @@ class DBTest < Test::Unit::TestCase
   @@conn  = Connection.new(@@host, @@port)
   @@db    = @@conn.db(MONGO_TEST_DB)
   @@users = @@db.collection('system.users')
+  @@version = @@conn.server_version
 
   def test_close
     @@conn.close
@@ -220,6 +221,15 @@ class DBTest < Test::Unit::TestCase
     assert !@@db.remove_user("joe")
   end
 
+
+  if @@version >= "1.3.5"
+    def test_db_stats
+      stats = @@db.stats
+      assert stats.has_key?('collections')
+      assert stats.has_key?('dataSize')
+    end
+  end
+
   context "database profiling" do
     setup do
       @db  = @@conn[MONGO_TEST_DB]