title: Rails mongoDB add new key-value pair
body: <p>I'm using MongoDB on Rails. If I want to add a new key-value pair in the existing collection, what is the syntax to do it? Suppose the collection name is User, is it similar to </p>
  
  <pre><code>User.create(:name =&gt; "john")
  </code></pre>
  
  <p>?</p>