Conditional Page Caching [Solution: Conditional Fragment Caching]

Question

Suppose that I have controller home_controller.rb with action index.

I want to cache index page so I\'m doing:

caches_page          


        

Answer 1

The accepted answer is now out of date, as conditional caching is now available in Rails 4. A pull request was merged into 4.0.0rc1 that allows for :if and :unless parameters to be passed to cache. This allows templates to be DRY, since there is no longer a need to duplicate the conditionally cached block.

Usage:

<% cache [ @user, 'form' ], :unless => @user.changed? do %>
  <%= render partial: 'shared/error_messages', locals: {instance: @user} %>
  <%= form_for @user do |f| %>
    

      
<%= f.label :name %>
      
<%= f.text_field :name %>
    
    

      <%= f.submit %>
    
  <% end %>
<% end %>