65 lines
2.0 KiB
Ruby
65 lines
2.0 KiB
Ruby
module ActionView
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# = Action View Cache Helper
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module Helpers
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module CacheHelper
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# This helper exposes a method for caching fragments of a view
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# rather than an entire action or page. This technique is useful
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# caching pieces like menus, lists of newstopics, static HTML
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# fragments, and so on. This method takes a block that contains
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# the content you wish to cache.
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#
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# See ActionController::Caching::Fragments for usage instructions.
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#
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# ==== Examples
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# If you want to cache a navigation menu, you can do following:
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#
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# <% cache do %>
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# <%= render :partial => "menu" %>
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# <% end %>
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#
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# You can also cache static content:
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#
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# <% cache do %>
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# <p>Hello users! Welcome to our website!</p>
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# <% end %>
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#
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# Static content with embedded ruby content can be cached as
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# well:
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#
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# <% cache do %>
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# Topics:
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# <%= render :partial => "topics", :collection => @topic_list %>
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# <i>Topics listed alphabetically</i>
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# <% end %>
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def cache(name = {}, options = nil, &block)
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if controller.perform_caching
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safe_concat(fragment_for(name, options, &block))
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else
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yield
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end
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nil
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end
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private
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# TODO: Create an object that has caching read/write on it
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def fragment_for(name = {}, options = nil, &block) #:nodoc:
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if fragment = controller.read_fragment(name, options)
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fragment
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else
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# VIEW TODO: Make #capture usable outside of ERB
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# This dance is needed because Builder can't use capture
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pos = output_buffer.length
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yield
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output_safe = output_buffer.html_safe?
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fragment = output_buffer.slice!(pos..-1)
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if output_safe
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self.output_buffer = output_buffer.class.new(output_buffer)
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end
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controller.write_fragment(name, fragment, options)
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end
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end
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end
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end
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end
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