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Diffstat (limited to 'activerecord/lib/active_record/aggregations.rb')
| -rw-r--r-- | activerecord/lib/active_record/aggregations.rb | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/aggregations.rb b/activerecord/lib/active_record/aggregations.rb index f0f34e9a99..cad8304bcf 100644 --- a/activerecord/lib/active_record/aggregations.rb +++ b/activerecord/lib/active_record/aggregations.rb @@ -108,6 +108,15 @@ module ActiveRecord # # Read more about value objects on http://c2.com/cgi/wiki?ValueObject and on the dangers of not keeping value objects # immutable on http://c2.com/cgi/wiki?ValueObjectsShouldBeImmutable + # + # == Finding records by a value object + # + # Once a +composed_of+ relationship is specified for a model, records can be loaded from the database by specifying an instance + # of the value object in the conditions hash. The following example finds all customers with +balance_amount+ equal to 20 and + # +balance_currency+ equal to "USD": + # + # Customer.find(:all, :conditions => {:balance => Money.new(20, "USD")}) + # module ClassMethods # Adds reader and writer methods for manipulating a value object: # <tt>composed_of :address</tt> adds <tt>address</tt> and <tt>address=(new_address)</tt> methods. |