diff --git a/app/serializer.rb b/app/serializer.rb
index 258be50..84a562f 100644
--- a/app/serializer.rb
+++ b/app/serializer.rb
@@ -1,2 +1,40 @@
 class Serializer
-end
+  # class variables 
+  @@attributes ||= {}
+  @@object ||= []
+
+  class << self
+    # define attribute in post and comment file
+    def attribute(value, &block)
+      @@attributes[self] ||= {}
+      @@attributes[self][value] = block_given? ? block : nil
+    end
+    
+    ## for date time we calling strf so object is declared here
+    def object
+      @@object
+    end
+  end
+
+  ## Initializer defined
+  def initialize(object)
+    ## Struct object when post or comment new call
+    @@object = object
+    
+    ## to get current class attributes
+    @data_hash = @@attributes[self.class]
+    
+    ## call json 
+    display_result
+  end
+
+  ## call rspec serilize method
+  def serialize
+    ## call from spec method
+    @data_hash
+  end
+
+  def display_result
+    @data_hash.each{|key, value| @data_hash[key] = value ? value.call() : @@object.send(key)}
+  end
+end
\ No newline at end of file