add cache_if and cache_unless on caching doc

rails · May 31, 2013 · 861ec91 · 861ec91
1 parent 48ac592
commit 861ec91
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/guides/source/caching_with_rails.md b/guides/source/caching_with_rails.md
@@ -104,6 +104,15 @@ This method generates a cache key that depends on all products and can be used i
   All available products:
 <% end %>
 ```
+
+If you want to cache a fragment under certain condition you can use `cache_if` or `cache_unless` 
+
+```erb
+<% cache_if (condition, cache_key_for_products) do %>
+  All available products:
+<% end %>
+```
+
 You can also use an Active Record model as the cache key:
 
 ```erb