Rails 2.3 Extras

Rails 2.3 Extras

Batch Find
What's New in Edge Rails: Batched Find

One quick caveat exists: you can’t specify :order or :limit in the options to find_each or find_in_batches as those values are used in the internal looping logic.

Batched finds are best used when you have a potentially large dataset and need to iterate through all rows. If done using a normal find the full result-set will be loaded into memory and could cause problems. With batched finds you can be sure that only 1000 * (each result-object size) will be loaded into memory

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Dynamic Scopes
What's New in Edge Rails: Dynamic Scope Methods

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Default Scopes
What's New in Edge Rails: Default Scoping

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Object#try
try()

you can avoid nil-checking by writing code like <%= @person.try(:name) %>. Well, now it’s baked right into Rails. As implemented in Rails, it raises NoMethodError on private methods and always returns nil if the object is nil.

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Smart Rendering of Partials
What's New in Edge Rails: render Stops Being High-Maintenance

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Unified Rendering
#order version<br />render :file => '/tmp/random_file.erb' <br />render :template => 'other_controller/action' <br />render :action => 'show'<br /><br />#Rails 2.3<br />render '/tmp/random_file.erb' <br />render 'other_controller/action' <br />render 'show' <br />render :show <br />