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| author | Matt Burke <spraints@gmail.com> | 2011-09-02 10:20:23 -0400 |
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| committer | Matt Burke <spraints@gmail.com> | 2011-09-02 10:20:23 -0400 |
| commit | 3a7c16dbb9c1a4ea96c516c0a9f9ce5d34cee49a (patch) | |
| tree | f432c3290f0060f99d2cacf202539621ca4b16aa /railties/guides | |
| parent | 36b640e4b56673ade9cf10051dc7624db2497d3a (diff) | |
| download | rails-3a7c16dbb9c1a4ea96c516c0a9f9ce5d34cee49a.tar.gz rails-3a7c16dbb9c1a4ea96c516c0a9f9ce5d34cee49a.tar.bz2 rails-3a7c16dbb9c1a4ea96c516c0a9f9ce5d34cee49a.zip | |
When a collection is empty, render returns nil.
Diffstat (limited to 'railties/guides')
| -rw-r--r-- | railties/guides/source/layouts_and_rendering.textile | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/railties/guides/source/layouts_and_rendering.textile b/railties/guides/source/layouts_and_rendering.textile index 310a70ca9b..3252f17c56 100644 --- a/railties/guides/source/layouts_and_rendering.textile +++ b/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> |