Fix #891: only dup (not deep_dup) InheritableValues.

Please also see #1034, where StackableValues are only dup'ed (not
deep_dup'ed).

Other changes:

* Add test to reproduce bug #891
* Remove support for deep_dup (no longer used)
* Add item to CHANGELOG

CHANGELOG.md

@@ -11,6 +11,7 @@ Next Release
 * [#1038](https://github.com/intridea/grape/pull/1038): Avoid dup-ing the String class when used in inherited params - [@rnubel](https://github.com/rnubel).
 * [#1042](https://github.com/intridea/grape/issues/1042): Fix coercion of complex arrays - [@dim](https://github.com/dim).
 * [#1045](https://github.com/intridea/grape/pull/1045): Do not convert `Rack::Response` to `Rack::Response` in middleware - [@dmitry](https://github.com/dmitry).
+* [#1048](https://github.com/intridea/grape/pull/1048): Only dup `InheritableValues`, remove support for `deep_dup` - [@toddmazierski](https://github.com/toddmazierski/)
 
 0.12.0 (6/18/2015)
 ==================

lib/grape.rb

@@ -9,14 +9,6 @@
 require 'set'
 require 'active_support/version'
 require 'active_support/core_ext/hash/indifferent_access'
-
-if ActiveSupport::VERSION::MAJOR >= 4
-  require 'active_support/core_ext/object/deep_dup'
-else
-  require_relative 'backports/active_support/deep_dup'
-end
-require_relative 'backports/active_support/duplicable'
-
 require 'active_support/ordered_hash'
 require 'active_support/core_ext/object/conversions'
 require 'active_support/core_ext/array/extract_options'

lib/grape/util/inheritable_values.rb

@@ -36,7 +36,7 @@ def to_hash
       def initialize_copy(other)
         super
         self.inherited_values = other.inherited_values
-        self.new_values = other.new_values.deep_dup
+        self.new_values = other.new_values.dup
       end
 
       protected

spec/grape/util/inheritable_values_spec.rb

@@ -60,9 +60,16 @@ module Util
       end
 
       describe '#clone' do
-        it 'clones itself even when containing a String class' do
-          subject[:foo] = String
-          expect(subject.clone.to_hash).to eq(foo: String)
+        let(:obj_cloned) { subject.clone }
+
+        context 'complex (i.e. not primitive) data types (ex. entity classes, please see bug #891)' do
+          let(:description) { { entity: double } }
+
+          before { subject[:description] = description }
+
+          it 'copies values; does not duplicate them' do
+            expect(obj_cloned[:description]).to eq description
+          end
         end
       end
     end