diff --git a/examples/performance.rb b/examples/performance.rb
new file mode 100644
index 0000000..d0c6668
--- /dev/null
+++ b/examples/performance.rb
@@ -0,0 +1,38 @@
+$:.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
+$:.unshift(File.dirname(__FILE__))
+require 'rubygems'
+require 'ncmb'
+require 'yaml'
+yaml = YAML.load_file(File.join(File.dirname(__FILE__), '..', 'setting.yml'))
+NCMB.initialize application_key: yaml['application_key'],  client_key: yaml['client_key']
+
+example = NCMB::DataStore.new 'Example'
+
+require 'benchmark'
+
+ary = []
+Benchmark.bm 10 do |r|
+  r.report "Save DataStore" do
+    100.times do |i|
+      item = example.new
+      item.set('String', "テスト#{i}00")
+      item.set('Integer', i)
+      item.set('Boolean', true)
+      item.set('Array', [i, i * 2, i * 3, "Orange", "Tomato"])
+      item.set('Object', {test1: 'a', test2: 'b'})
+      item.set('Location', NCMB::GeoPoint.new(30, 50))
+      item.set('MultipleLine', "test\ntest\n")
+      item.set('Increment', NCMB::Increment.new(i + 1))
+      item.set('Date', Time.now)
+      item.save
+      ary << item.objectId
+    end
+  end
+  r.report "Delete objects" do
+    ary.each do |objectId|
+      item = example.new(objectId: objectId)
+      item.delete
+    end
+  end
+end
+
diff --git a/examples/pointer_test.rb b/examples/pointer_test.rb
new file mode 100644
index 0000000..32326d1
--- /dev/null
+++ b/examples/pointer_test.rb
@@ -0,0 +1,16 @@
+$:.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
+$:.unshift(File.dirname(__FILE__))
+require 'rubygems'
+require 'ncmb'
+require 'yaml'
+yaml = YAML.load_file(File.join(File.dirname(__FILE__), '..', 'setting.yml'))
+NCMB.initialize application_key: yaml['application_key'],  client_key: yaml['client_key']
+
+Parent = NCMB::DataStore.new 'Parent'
+
+Child = NCMB::DataStore.new 'Child'
+child = Child.new(name: "Taro")
+parent = Parent.new(name: "Oya")
+parent.child = child
+parent.save
+
diff --git a/examples/relation.rb b/examples/relation.rb
new file mode 100644
index 0000000..5c4b45f
--- /dev/null
+++ b/examples/relation.rb
@@ -0,0 +1,22 @@
+$:.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
+$:.unshift(File.dirname(__FILE__))
+require 'rubygems'
+require 'ncmb'
+require 'yaml'
+yaml = YAML.load_file(File.join(File.dirname(__FILE__), '..', 'setting.yml'))
+NCMB.initialize application_key: yaml['application_key'],  client_key: yaml['client_key']
+
+Food = NCMB::DataStore.new 'Food'
+
+Basket = NCMB::DataStore.new('Basket')
+basket = Basket.new
+basket.foods = []
+basket.foods << Food.new(name: "banana", type: "fruit")
+basket.foods << Food.new(name: "pear", type: "fruit")
+
+# relation = NCMB::Relation.new
+# relation << Food.new(name: "banana", type: "fruit", objectId: "test1")
+# relation << Food.new(name: "pear", type: "fruit", objectId: "test2")
+
+# puts basket.fields
+basket.save
diff --git a/lib/ncmb.rb b/lib/ncmb.rb
index fdb15c5..b4b2d36 100644
--- a/lib/ncmb.rb
+++ b/lib/ncmb.rb
@@ -22,4 +22,5 @@
 require "ncmb/increment"
 require "ncmb/acl"
 require "ncmb/role"
+require "ncmb/relation"
 require "ncmb/error"
diff --git a/lib/ncmb/acl.rb b/lib/ncmb/acl.rb
index be17cd7..a3423cb 100644
--- a/lib/ncmb/acl.rb
+++ b/lib/ncmb/acl.rb
@@ -1,5 +1,5 @@
 module NCMB
-  class Acl < NCMB::Object
+  class Acl
     include NCMB
     
     def initialize(params = nil)
diff --git a/lib/ncmb/object.rb b/lib/ncmb/object.rb
index 7beecc8..eb0dae0 100644
--- a/lib/ncmb/object.rb
+++ b/lib/ncmb/object.rb
@@ -12,6 +12,10 @@ def fields
       @fields
     end
     
+    def ClassName
+      @name
+    end
+    
     def method_missing(name, value = nil)
       if name =~ /.*=$/
         sym = name.to_s.gsub(/(.*?)=$/, '\1').to_sym
@@ -56,7 +60,29 @@ def path
       "#{base_path}/#{@fields[:objectId] || '' }"
     end
     
+    def saved?
+      @fields[:objectId] != nil
+    end
+    
     def post
+      @fields.each do |key, field|
+        if field.is_a?(NCMB::Object)
+          field.save unless field.saved?
+          @fields[key] = {
+            __type: "Pointer",
+            className: field.ClassName,
+            objectId: field.objectId
+          }
+        end
+        if field.is_a?(Array) && field[0].is_a?(NCMB::Object)
+          relation = NCMB::Relation.new
+          field.each do |sub_field|
+            sub_field.save unless sub_field.saved?
+            relation << sub_field
+          end
+          @fields[key] = relation
+        end
+      end
       result = @@client.post path, @fields
       @fields.merge!(result)
       self
diff --git a/lib/ncmb/relation.rb b/lib/ncmb/relation.rb
new file mode 100644
index 0000000..7c72eec
--- /dev/null
+++ b/lib/ncmb/relation.rb
@@ -0,0 +1,24 @@
+module NCMB
+  class Relation < Array
+    include NCMB
+    
+    def initialize
+      
+    end
+    
+    def to_json(a = "")
+      params = {
+        "__op": "AddRelation",
+      }
+      params["objects"] = []
+      self.each do |obj|
+        params["objects"] << {
+          "__type": "Pointer",
+          "className": obj.ClassName,
+          "objectId": obj.objectId
+        }
+      end
+      params.to_json
+    end
+  end
+end
\ No newline at end of file
diff --git a/lib/ncmb/version.rb b/lib/ncmb/version.rb
index 4025596..ff5bae7 100644
--- a/lib/ncmb/version.rb
+++ b/lib/ncmb/version.rb
@@ -1,3 +1,3 @@
 module Ncmb
-  VERSION = "0.1.1"
+  VERSION = "0.1.2"
 end