title: Create array object in a class, ruby
body: <p>I have created two classes, Blog and Post, try to create an array of Post, in Blog, shows me the following error: "undefined method` push 'for {}: Hash "</p>
  
  <p>How I can do to keep in the Array?</p>
  
  <pre><code>class Blog
      def initialize
          @post = {}
      end
      def addPost (newPost)
  #Here I try to add an object blog, post an array of objects
          @post.push(newPost)
      end
  end
  class Post
      def initialize title, date, text
          @title = title
          @date = date
          @text = text
      end
      def printPost
          puts "#{@title} \n #{@date} \n ****************** \n #{@text}"
      end
  end
  myBlog = Blog.new
  firstPost = Post.new("First Post", "21/12/2014", "This is my first post on my first blog")
  secondPost = Post.new("Second Post", "11/10/2015", "This is my seocond post on my first blog")
  myBlog.addPost(firstPost)
  myBlog.addPost(secondPost)
  </code></pre>
  
  <p>Thanks</p>