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When a collection is empty, render returns nil.

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1 parent 36b640e commit 3a7c16dbb9c1a4ea96c516c0a9f9ce5d34cee49a @spraints spraints committed Sep 2, 2011
Showing with 7 additions and 0 deletions.
  1. +7 −0 railties/guides/source/layouts_and_rendering.textile
@@ -1093,6 +1093,13 @@ In Rails 3.0, there is also a shorthand for this. Assuming +@products+ is a coll
Rails determines the name of the partial to use by looking at the model name in the collection. In fact, you can even create a heterogeneous collection and render it this way, and Rails will choose the proper partial for each member of the collection:
+In the event that the collection is empty, +render+ will return nil, so it should be fairly simple to provide alternative content.
+
+<erb>
+<h1>Products</h1>
+<%= render(@products) || 'There are no products available.' %>
+</erb>
+
* +index.html.erb+
<erb>

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