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| -rw-r--r-- | guides/source/caching_with_rails.md | 23 |
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diff --git a/guides/source/caching_with_rails.md b/guides/source/caching_with_rails.md index 3836645b3f..9d03b522bb 100644 --- a/guides/source/caching_with_rails.md +++ b/guides/source/caching_with_rails.md @@ -103,6 +103,29 @@ If you want to cache a fragment under certain conditions, you can use <% end %> ``` +#### Collection caching + +The `render` helper can also cache individual templates rendered for a collection. +It can even one up the previous example with `each` by reading all cache +templates at once instead of one by one. This is done automatically if the template +rendered by the collection includes a `cache` call. Take a collection that renders +a `products/_product.html.erb` partial for each element: + +```ruby +render products +``` + +If `products/_product.html.erb` starts with a `cache` call like so: + +```html+erb +<% cache product do %> + <%= product.name %> +<% end %> + +All the cached templates from previous renders will be fetched at once with much +greater speed. There's more info on how to make your templates [eligible for +collection caching](http://api.rubyonrails.org/classes/ActionView/Template/Handlers/ERB.html#method-i-resource_cache_call_pattern). + ### Russian Doll Caching You may want to nest cached fragments inside other cached fragments. This is |