Removing composed_of from ActiveRecord.

This feature adds a lot of complication to ActiveRecord for dubious
value. Let's talk about what it does currently:

class Customer < ActiveRecord::Base
  composed_of :balance, :class_name => "Money", :mapping => %w(balance amount)
end

Instead, you can do something like this:

    def balance
      @balance ||= Money.new(value, currency)
    end

    def balance=(balance)
      self[:value] = balance.value
      self[:currency] = balance.currency
      @balance = balance
    end

Since that's fairly easy code to write, and doesn't need anything
extra from the framework, if you use composed_of today, you'll
have to add accessors/mutators like that.

Closes #1436
Closes #2084
Closes #3807

1 files changed, 0 insertions, 12 deletions

diff --git a/activerecord/README.rdoc b/activerecord/README.rdoc
index d080e0b0f5..60965590a1 100644
--- a/activerecord/README.rdoc
+++ b/activerecord/README.rdoc
@@ -46,18 +46,6 @@ A short rundown of some of the major features:
   {Learn more}[link:classes/ActiveRecord/Associations/ClassMethods.html]
 
 
-* Aggregations of value objects.
-
-   class Account < ActiveRecord::Base
-     composed_of :balance, :class_name => "Money",
-                 :mapping => %w(balance amount)
-     composed_of :address,
-                 :mapping => [%w(address_street street), %w(address_city city)]
-   end
-
-  {Learn more}[link:classes/ActiveRecord/Aggregations/ClassMethods.html]
-
-
 * Validation rules that can differ for new or existing objects.
 
     class Account < ActiveRecord::Base