Question

how iterating through serialized hash and show just keys on the view?

policy model

class Policy < ActiveRecord::Base
  belongs_to :user
   serialize :shipping, JSON
end

index

<% @policy.shipping.each do |key, value|%>
<ul><li><%= key %></li></ul>
<% end %>

Answer 1

Hash has a keys method, which returns its keys. So you can do the same with the following code:

<ul>
<% @policy.shipping.keys.each do |key| %>
  <li><%= key %></li>
<% end %>
</ul>

You should also note that the <ul> tag should not be inside the loop.