title: Can I store arrays in hstore with Rails
body: <p>I want to save data like this:</p>
  
  <p><code>User.create(name:"Guy", properties:{url:["url1","url2","url3"], street_address:"asdf"})</code></p>
  
  <p>Can I do so in Rails 4? So far, I have tried migration:
  <code>add_column :users, :properties, :hstore, array: true</code></p>
  
  <p>But when I save the array in hstore, it returns error:</p>
  
  <p><code>PG::InvalidTextRepresentation: ERROR:  array value must start with "{" or dimension information</code></p>