diff --git a/.travis.yml b/.travis.yml
index 196eba8..21aba45 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,10 @@
 language: ruby
 
 before_install:
-  - gem install bundler --pre
+  - gem install bundler
+
+services:
+  - mongodb
 
 rvm:
   - 1.9.3
diff --git a/lib/draper/decoratable.rb b/lib/draper/decoratable.rb
index da590c5..de74e39 100644
--- a/lib/draper/decoratable.rb
+++ b/lib/draper/decoratable.rb
@@ -53,7 +53,8 @@ module Draper
       # @param [Hash] options
       #   see {Decorator.decorate_collection}.
       def decorate(options = {})
-        decorator_class(options[:namespace]).decorate_collection(scoped, options.reverse_merge(with: nil))
+        collection = Rails::VERSION::MAJOR >= 4 ? all : scoped
+        decorator_class(options[:namespace]).decorate_collection(collection, options.reverse_merge(with: nil))
       end
 
       # Infers the decorator class to be used by {Decoratable#decorate} (e.g.
diff --git a/spec/draper/decoratable_spec.rb b/spec/draper/decoratable_spec.rb
index 2c8d463..67d0730 100644
--- a/spec/draper/decoratable_spec.rb
+++ b/spec/draper/decoratable_spec.rb
@@ -108,9 +108,11 @@ module Draper
     end
 
     describe ".decorate" do
+      let(:scoping_method) { Rails::VERSION::MAJOR >= 4 ? :all : :scoped }
+
       it "calls #decorate_collection on .decorator_class" do
         scoped = [Product.new]
-        Product.stub scoped: scoped
+        Product.stub scoping_method => scoped
 
         Product.decorator_class.should_receive(:decorate_collection).with(scoped, with: nil).and_return(:decorated_collection)
         expect(Product.decorate).to be :decorated_collection
@@ -118,7 +120,7 @@ module Draper
 
       it "accepts options" do
         options = {with: ProductDecorator, context: {some: "context"}}
-        Product.stub scoped: []
+        Product.stub scoping_method => []
 
         Product.decorator_class.should_receive(:decorate_collection).with([], options)
         Product.decorate(options)
diff --git a/spec/dummy/app/decorators/mongoid_post_decorator.rb b/spec/dummy/app/decorators/mongoid_post_decorator.rb
new file mode 100644
index 0000000..61596e4
--- /dev/null
+++ b/spec/dummy/app/decorators/mongoid_post_decorator.rb
@@ -0,0 +1,2 @@
+class MongoidPostDecorator < Draper::Decorator
+end
diff --git a/spec/dummy/spec/decorators/post_decorator_spec.rb b/spec/dummy/spec/decorators/post_decorator_spec.rb
index e90011c..453d2d5 100755
--- a/spec/dummy/spec/decorators/post_decorator_spec.rb
+++ b/spec/dummy/spec/decorators/post_decorator_spec.rb
@@ -46,8 +46,8 @@ describe PostDecorator do
   end
 
   it "serializes to XML" do
-    # Rails < 3.2 does not use `serializable_hash` in `to_xml`
-    pending if Rails.version.to_f < 3.2
+    pending("Rails < 3.2 does not use `serializable_hash` in `to_xml`") if Rails.version.to_f < 3.2
+
     xml = Capybara.string(decorator.to_xml)
     expect(xml).to have_css "post > updated-at", text: "overridden"
   end
diff --git a/spec/dummy/spec/models/mongoid_post_spec.rb b/spec/dummy/spec/models/mongoid_post_spec.rb
index a5a35d0..1707bd1 100644
--- a/spec/dummy/spec/models/mongoid_post_spec.rb
+++ b/spec/dummy/spec/models/mongoid_post_spec.rb
@@ -1,10 +1,8 @@
 require 'spec_helper'
+require 'shared_examples/decoratable'
 
 if defined?(Mongoid)
   describe MongoidPost do
-    it "is decoratable" do
-      expect(MongoidPost).to respond_to :decorator_class
-      expect(MongoidPost.new).to respond_to :decorate
-    end
+    it_behaves_like "a decoratable model"
   end
 end
diff --git a/spec/dummy/spec/models/post_spec.rb b/spec/dummy/spec/models/post_spec.rb
index 4e7ef44..8bdd192 100644
--- a/spec/dummy/spec/models/post_spec.rb
+++ b/spec/dummy/spec/models/post_spec.rb
@@ -1,14 +1,6 @@
 require 'spec_helper'
+require 'shared_examples/decoratable'
 
 describe Post do
-  describe "#==" do
-    it "is true for other instances' decorators" do
-      Post.create
-      one = Post.first
-      other = Post.first
-
-      expect(one).not_to be other
-      expect(one == other.decorate).to be_true
-    end
-  end
+  it_behaves_like "a decoratable model"
 end
diff --git a/spec/dummy/spec/shared_examples/decoratable.rb b/spec/dummy/spec/shared_examples/decoratable.rb
new file mode 100644
index 0000000..a20b058
--- /dev/null
+++ b/spec/dummy/spec/shared_examples/decoratable.rb
@@ -0,0 +1,24 @@
+shared_examples_for "a decoratable model" do
+  describe ".decorate" do
+    it "applies a collection decorator to a scope" do
+      described_class.create
+      decorated = described_class.limit(1).decorate
+
+      expect(decorated).to have(1).items
+      expect(decorated).to be_decorated
+    end
+  end
+
+  describe "#==" do
+    it "is true for other instances' decorators" do
+      pending "Mongoid < 3.1 overrides `#==`" if defined?(Mongoid) && Mongoid::VERSION.to_f < 3.1 && described_class < Mongoid::Document
+
+      described_class.create
+      one = described_class.first
+      other = described_class.first
+
+      expect(one).not_to be other
+      expect(one == other.decorate).to be_true
+    end
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 4fa0fd1..db6510f 100755
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,5 +1,6 @@
 require 'bundler/setup'
 require 'draper'
+require 'rails/version'
 require 'action_controller'
 require 'action_controller/test_case'