Mongoize dynamic fields.

[ fix #2826 ]

CHANGELOG.md

@@ -13,6 +13,8 @@ For instructions on upgrading to newer versions, visit
   middle of a parent update will now properly execute the deletion.
   (Arthur Neves)
 
+* \#2826 Dynamic fields are now properly mongoized.
+
 * \#2822 Marshal load of relations now properly reapplies extensions.
 
 ## 3.0.22

lib/mongoid/attributes.rb

@@ -270,7 +270,7 @@ def method_missing(name, *args)
     #
     # @since 1.0.0
     def typed_value_for(key, value)
-      fields.has_key?(key) ? fields[key].mongoize(value) : value
+      fields.has_key?(key) ? fields[key].mongoize(value) : value.mongoize
     end
 
     module ClassMethods

spec/mongoid/attributes_spec.rb

@@ -572,6 +572,25 @@
         person.respond_to?(:testing).should be_true
       end
     end
+
+    context "when the provided value needs mongoization" do
+
+      let(:new_years) do
+        DateTime.new(2013, 1, 1, 0, 0, 0)
+      end
+
+      before do
+        person[:new_years] = new_years
+      end
+
+      it "mongoizes the dynamic field" do
+        person.new_years.should be_a(Time)
+      end
+
+      it "keeps the same value" do
+        person.new_years.should eq(new_years)
+      end
+    end
   end
 
   describe "#process" do