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each -> find_each in 2.3 release notes

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Xavier Noria 2009-03-12 13:49:52 +01:00
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railties/guides/source/2_3_release_notes.textile
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@ -141,19 +141,19 @@ end
You can pass most of the +find+ options into +find_in_batches+. However, you cannot specify the order that records will be returned in (they will always be returned in ascending order of primary key, which must be an integer), or use the +:limit+ option. Instead, use the +:batch_size+ option, which defaults to 1000, to set the number of records that will be returned in each batch.
The new +each+ method provides a wrapper around +find_in_batches+ that returns individual records, with the find itself being done in batches (of 1000 by default):
The new +find_each+ method provides a wrapper around +find_in_batches+ that returns individual records, with the find itself being done in batches (of 1000 by default):
<ruby>
Customer.each do |customer|
Customer.find_each do |customer|
customer.update_account_balance!
end
</ruby>
Note that you should only use this method for batch processing: for small numbers of records (less than 1000), you should just use the regular find methods with your own loop.
* More Information:
- "Rails 2.3: Batch Finding":http://afreshcup.com/2009/02/23/rails-23-batch-finding/
- "What's New in Edge Rails: Batched Find":http://ryandaigle.com/articles/2009/2/23/what-s-new-in-edge-rails-batched-find
* More Information (at that point the convenience method was called just +each+):
** "Rails 2.3: Batch Finding":http://afreshcup.com/2009/02/23/rails-23-batch-finding/
** "What's New in Edge Rails: Batched Find":http://ryandaigle.com/articles/2009/2/23/what-s-new-in-edge-rails-batched-find
h4. Multiple Conditions for Callbacks