1 files changed, 28 insertions, 3 deletions

diff --git a/activemodel/lib/active_model/serialization.rb b/activemodel/lib/active_model/serialization.rb
index 9260c5082d..a4b58ab456 100644
--- a/activemodel/lib/active_model/serialization.rb
+++ b/activemodel/lib/active_model/serialization.rb
@@ -1,5 +1,7 @@
 require 'active_support/core_ext/hash/except'
 require 'active_support/core_ext/hash/slice'
+require 'active_support/core_ext/array/wrap'
+
 
 module ActiveModel
   # == Active Model Serialization
@@ -76,8 +78,11 @@ module ActiveModel
         attribute_names -= Array.wrap(except).map(&:to_s)
       end
 
+      hash = {}
+      attribute_names.each { |n| hash[n] = read_attribute_for_serialization(n) }
+
       method_names = Array.wrap(options[:methods]).select { |n| respond_to?(n) }
-      hash = Hash[(attribute_names + method_names).map { |n| [n, send(n)] }]
+      method_names.each { |n| hash[n] = send(n) }
 
       serializable_add_includes(options) do |association, records, opts|
         hash[association] = if records.is_a?(Enumerable)
@@ -91,17 +96,37 @@ module ActiveModel
     end
 
     private
+
+      # Hook method defining how an attribute value should be retrieved for
+      # serialization. By default this is assumed to be an instance named after
+      # the attribute. Override this method in subclasses should you need to
+      # retrieve the value for a given attribute differently:
+      #
+      #   class MyClass
+      #     include ActiveModel::Validations
+      #
+      #     def initialize(data = {})
+      #       @data = data
+      #     end
+      #
+      #     def read_attribute_for_serialization(key)
+      #       @data[key]
+      #     end
+      #   end
+      #
+      alias :read_attribute_for_serialization :send
+
       # Add associations specified via the <tt>:include</tt> option.
       #
       # Expects a block that takes as arguments:
       #   +association+ - name of the association
       #   +records+     - the association record(s) to be serialized
       #   +opts+        - options for the association records
-      def serializable_add_includes(options = {})
+      def serializable_add_includes(options = {}) #:nodoc:
         return unless include = options[:include]
 
         unless include.is_a?(Hash)
-          include = Hash[Array.wrap(include).map { |n| [n, {}] }]
+          include = Hash[Array.wrap(include).map { |n| n.is_a?(Hash) ? n.to_a.first : [n, {}] }]
         end
 
         include.each do |association, opts|