diff --git a/Guardfile b/Guardfile
new file mode 100644
index 000000000..8a58a1cc4
--- /dev/null
+++ b/Guardfile
@@ -0,0 +1,42 @@
+# A sample Guardfile
+# More info at https://github.com/guard/guard#readme
+
+## Uncomment and set this to only include directories you want to watch
+# directories %w(app lib config test spec features) \
+#  .select{|d| Dir.exists?(d) ? d : UI.warning("Directory #{d} does not exist")}
+
+## Note: if you are using the `directories` clause above and you are not
+## watching the project directory ('.'), then you will want to move
+## the Guardfile to a watched dir and symlink it back, e.g.
+#
+#  $ mkdir config
+#  $ mv Guardfile config/
+#  $ ln -s config/Guardfile .
+#
+# and, you'll have to watch "config/Guardfile" instead of "Guardfile"
+
+guard :minitest do
+  # with Minitest::Unit
+  watch(%r{^test/(.*)\/?(.*)_test\.rb$})
+  watch(%r{^lib/(.*/)?([^/]+)\.rb$})     { |m| "test/#{m[1]}test_#{m[2]}.rb" }
+  watch(%r{^test/test_helper\.rb$})      { 'test' }
+
+  # with Minitest::Spec
+  # watch(%r{^spec/(.*)_spec\.rb$})
+  # watch(%r{^lib/(.+)\.rb$})         { |m| "spec/#{m[1]}_spec.rb" }
+  # watch(%r{^spec/spec_helper\.rb$}) { 'spec' }
+
+  # Rails 4
+  # watch(%r{^app/(.+)\.rb$})                               { |m| "test/#{m[1]}_test.rb" }
+  # watch(%r{^app/controllers/application_controller\.rb$}) { 'test/controllers' }
+  # watch(%r{^app/controllers/(.+)_controller\.rb$})        { |m| "test/integration/#{m[1]}_test.rb" }
+  # watch(%r{^app/views/(.+)_mailer/.+})                   { |m| "test/mailers/#{m[1]}_mailer_test.rb" }
+  # watch(%r{^lib/(.+)\.rb$})                               { |m| "test/lib/#{m[1]}_test.rb" }
+  # watch(%r{^test/.+_test\.rb$})
+  # watch(%r{^test/test_helper\.rb$}) { 'test' }
+
+  # Rails < 4
+  # watch(%r{^app/controllers/(.*)\.rb$}) { |m| "test/functional/#{m[1]}_test.rb" }
+  # watch(%r{^app/helpers/(.*)\.rb$})     { |m| "test/helpers/#{m[1]}_test.rb" }
+  # watch(%r{^app/models/(.*)\.rb$})      { |m| "test/unit/#{m[1]}_test.rb" }
+end
diff --git a/jsonapi-resources.gemspec b/jsonapi-resources.gemspec
index 7bc6a8f5d..270ab0c0c 100644
--- a/jsonapi-resources.gemspec
+++ b/jsonapi-resources.gemspec
@@ -23,8 +23,12 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'minitest'
   spec.add_development_dependency 'minitest-spec-rails'
+  spec.add_development_dependency 'minitest-focus'
   spec.add_development_dependency 'minitest-reporters'
+  spec.add_development_dependency 'awesome_print'
   spec.add_development_dependency 'simplecov'
   spec.add_development_dependency 'pry'
+  spec.add_development_dependency 'guard'
+  spec.add_development_dependency 'guard-minitest'
   spec.add_dependency 'rails', '>= 4.0'
 end
diff --git a/test/fixtures/active_record.rb b/test/fixtures/active_record.rb
index abd21e8c9..f94d66402 100644
--- a/test/fixtures/active_record.rb
+++ b/test/fixtures/active_record.rb
@@ -208,6 +208,15 @@
     t.string :serial_number
     t.integer :person_id
   end
+
+  create_table :parents, force: true do |t|
+    t.string :name
+  end
+
+  create_table :children, force: true do |t|
+    t.string :name
+    t.integer :parent_id
+  end
 end
 
 ### MODELS
@@ -440,6 +449,16 @@ class Product < ActiveRecord::Base
   has_one :picture, as: :imageable
 end
 
+class Parent < ActiveRecord::Base
+  has_one :child
+
+  accepts_nested_attributes_for :child
+end
+
+class Child < ActiveRecord::Base
+  belongs_to :parent
+end
+
 ### OperationsProcessor
 class CountingActiveRecordOperationsProcessor < ActiveRecordOperationsProcessor
   after_find_operation do
@@ -866,6 +885,28 @@ def _save
   end
 end
 
+class ParentResource < JSONAPI::Resource
+  attribute :name
+
+  has_one :child
+
+  private
+
+  def child_attributes=(attributes)
+    @model.child_attributes = attributes
+  end
+
+  def self.creatable_fields(context)
+    super + [:child_attributes]
+  end
+end
+
+class ChildResource < JSONAPI::Resource
+  attribute :name
+
+  has_one :parent
+end
+
 class PlanetResource < JSONAPI::Resource
   attribute :name
   attribute :description
diff --git a/test/fixtures/children.yml b/test/fixtures/children.yml
new file mode 100644
index 000000000..edba5edea
--- /dev/null
+++ b/test/fixtures/children.yml
@@ -0,0 +1,4 @@
+a:
+  id: 1
+  name: Daniel Jr.
+  parent_id: 1
diff --git a/test/fixtures/parents.yml b/test/fixtures/parents.yml
new file mode 100644
index 000000000..9ffdb8bd7
--- /dev/null
+++ b/test/fixtures/parents.yml
@@ -0,0 +1,3 @@
+a:
+  id: 1
+  name: Daniel
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 961b36aee..eca429d92 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -13,8 +13,11 @@
 require 'rails/all'
 require 'rails/test_help'
 require 'minitest/mock'
+require 'minitest/reporters'
+require 'minitest/focus'
 require 'jsonapi-resources'
 require 'pry'
+require 'awesome_print'
 
 require File.expand_path('../helpers/value_matchers', __FILE__)
 require File.expand_path('../helpers/assertions', __FILE__)
@@ -256,6 +259,8 @@ class CatResource < JSONAPI::Resource
 # Ensure backward compatibility with Minitest 4
 Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)
 
+Minitest::Reporters.use! [Minitest::Reporters::DefaultReporter.new(color: true)]
+
 class Minitest::Test
   include Helpers::Assertions
   include Helpers::ValueMatchers
diff --git a/test/unit/operation/operations_processor_test.rb b/test/unit/operation/operations_processor_test.rb
index 3e26ba965..a887a49d8 100644
--- a/test/unit/operation/operations_processor_test.rb
+++ b/test/unit/operation/operations_processor_test.rb
@@ -99,6 +99,36 @@ def test_create_multiple_resources
     assert_equal(Planet.count, count + 3)
   end
 
+  def test_create_single_resource_with_nested_attributes
+    op = TestOperationsProcessor.new()
+
+    child_count = Child.count
+    parent_count = Parent.count
+
+    operations = [
+      JSONAPI::CreateResourceOperation.new(ParentResource,
+        data: {
+          attributes: {
+            'name' => 'earth',
+            'child_attributes' => {
+              'name' => 'earth jr.'
+            }
+          }
+        })
+    ]
+
+    request = JSONAPI::Request.new
+    request.operations = operations
+
+    operation_results = op.process(request)
+
+    assert_kind_of(JSONAPI::OperationResults, operation_results)
+    assert_equal(:created, operation_results.results[0].code)
+    assert_equal(operation_results.results.size, 1)
+    assert_equal(Child.count, child_count + 1)
+    assert_equal(Parent.count, parent_count + 1)
+  end
+
   def test_replace_to_one_relationship
     op = JSONAPI::OperationsProcessor.new()
 
@@ -520,7 +550,7 @@ def test_safe_run_callback_catch_fail
     error = StandardError.new
 
     callback = ->(error) { nil.explosions}
-    result = op.send(:safe_run_callback, callback, error) 
+    result = op.send(:safe_run_callback, callback, error)
 
     assert_instance_of(JSONAPI::ErrorsOperationResult, result)
     assert_equal(result.code, 500)