fragment caching

# implementation
module Merb::Cache::CacheMixin
  def fetch_partial(template, opts={}, conditions = {})
    template_id = template.to_s
    if template_id =~ %r{^/}
      template_path = File.dirname(template_id) / "_#{File.basename(template_id)}"
    else
      kontroller = (m = template_id.match(/.*(?=\/)/)) ? m[0] : controller_name
      template_id = "_#{File.basename(template_id)}"
    end

    unused, template_key = _template_for(template_id, opts.delete(:format) || content_type, kontroller, template_path)

    Merb::Cache[_lookup_store(conditions)].fetch(template_key, opts, conditions) { partial(template, opts) }
  end
end

# use
.main
  .posts
    -@posts.each do |post|
      =fetch_partial :view, :post => post