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Added section on having.

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Ryan Bigg
2008-12-22 00:27:37 +10:30
parent e691d486a9
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railties/doc/guides/source/finders.txt
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@@ -364,6 +364,19 @@ The SQL that would be executed would be something like this:
SELECT * FROM orders GROUP BY date(created_at)
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== Having
The having option allows you to specify SQL and acts as a kind of a filter on the group option. +:having+ can only be specified when +:group+ is specified.
An example of using it would be:
[source, ruby]
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Order.all(:group => "date(created_at)", :having => ["created_at > ?", Time.now - 1.month])
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This will return single order objects for each day, but only for the last month.
== Read Only
Readonly is a +find+ option that you can set in order to make that instance of the record read-only. Any attempt to alter or destroy the record will not succeed, raising an ActiveRecord::ReadOnlyRecord exception. To set this option, specify it like this:
@@ -759,6 +772,7 @@ Thanks to Mike Gunderloy for his tips on creating this guide.
http://rails.lighthouseapp.com/projects/16213-rails-guides/tickets/16[Lighthouse ticket]
* December 22 2008: Added section on having.
* December 22 2008: Added description of how to make hash conditions use an IN expression http://rails.loglibrary.com/chats/15279234[mentioned here]
* December 22 2008: Mentioned using SQL as values for the lock option as mentioned in http://rails.lighthouseapp.com/projects/16213-rails-guides/tickets/16-activerecord-finders#ticket-16-24[this ticket]
* December 21 2008: Fixed http://rails.lighthouseapp.com/projects/16213/tickets/16-activerecord-finders#ticket-16-22[this ticket] minus two points; the lock SQL syntax and the having option.