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String interpolation conditions

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Pratik Naik 2009-04-23 14:25:35 +01:00
parent 5a1fe9039b
commit 67f30fd963
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11
railties/guides/source/association_basics.textile
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@ -1219,6 +1219,17 @@ end
If you use a hash-style +:conditions+ option, then record creation via this association will be automatically scoped using the hash. In this case, using +@customer.confirmed_orders.create+ or +@customer.confirmed_orders.build+ will create orders where the confirmed column has the value +true+.
If you need to evaluate conditions dynamically at runtime, you could use string interpolation in single quotes:
<ruby>
class Customer < ActiveRecord::Base
has_many :latest_orders, :class_name => "Order",
:conditions => 'orders.created_at > #{10.hours.ago.to_s(:db).inspect}'
end
</ruby>
Be sure to use single quotes.
h6. +:counter_sql+
Normally Rails automatically generates the proper SQL to count the association members. With the +:counter_sql+ option, you can specify a complete SQL statement to count them yourself.