diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 0000000..3ffe2b0
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,2 @@
+inherit_from: .rubocop_todo.yml
+
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
new file mode 100644
index 0000000..ed49631
--- /dev/null
+++ b/.rubocop_todo.yml
@@ -0,0 +1,24 @@
+# This configuration was generated by `rubocop --auto-gen-config`
+# on 2015-01-13 18:47:14 -0500 using RuboCop version 0.28.0.
+# The point is for the user to remove these configuration records
+# one by one as the offenses are removed from the code base.
+# Note that changes in the inspected code, or installation of new
+# versions of RuboCop, may require this file to be generated again.
+
+# Offense count: 25
+# Configuration parameters: AllowURI, URISchemes.
+Metrics/LineLength:
+  Max: 179
+
+# Offense count: 7
+Style/Documentation:
+  Enabled: false
+
+# Offense count: 2
+# Configuration parameters: Exclude.
+Style/FileName:
+  Enabled: false
+
+# Offense count: 4
+Style/RegexpLiteral:
+  MaxSlashes: 0
diff --git a/Guardfile b/Guardfile
index f547850..4ee6431 100644
--- a/Guardfile
+++ b/Guardfile
@@ -4,15 +4,15 @@
 guard 'rspec' do
   watch(%r{^spec/.+_spec\.rb$})
   watch(%r{^lib/(.+)\.rb$})     { |m| "spec/lib/#{m[1]}_spec.rb" }
-  watch('spec/spec_helper.rb')  { "spec" }
+  watch('spec/spec_helper.rb')  { 'spec' }
 
   # Rails example
   watch(%r{^app/(.+)\.rb$})                           { |m| "spec/#{m[1]}_spec.rb" }
   watch(%r{^app/(.*)(\.erb|\.haml)$})                 { |m| "spec/#{m[1]}#{m[2]}_spec.rb" }
   watch(%r{^app/controllers/(.+)_(controller)\.rb$})  { |m| ["spec/routing/#{m[1]}_routing_spec.rb", "spec/#{m[2]}s/#{m[1]}_#{m[2]}_spec.rb", "spec/acceptance/#{m[1]}_spec.rb"] }
-  watch(%r{^spec/support/(.+)\.rb$})                  { "spec" }
-  watch('config/routes.rb')                           { "spec/routing" }
-  watch('app/controllers/application_controller.rb')  { "spec/controllers" }
+  watch(%r{^spec/support/(.+)\.rb$})                  { 'spec' }
+  watch('config/routes.rb')                           { 'spec/routing' }
+  watch('app/controllers/application_controller.rb')  { 'spec/controllers' }
 
   # Capybara features specs
   watch(%r{^app/views/(.+)/.*\.(erb|haml)$})          { |m| "spec/features/#{m[1]}_spec.rb" }
@@ -21,4 +21,3 @@ guard 'rspec' do
   watch(%r{^spec/acceptance/(.+)\.feature$})
   watch(%r{^spec/acceptance/steps/(.+)_steps\.rb$})   { |m| Dir[File.join("**/#{m[1]}.feature")][0] || 'spec/acceptance' }
 end
-
diff --git a/README.md b/README.md
index 9b3a796..2012fa0 100644
--- a/README.md
+++ b/README.md
@@ -82,18 +82,18 @@ end
 
 ```ruby
 # Serializer options can be specified on routes or namespaces.
-namespace 'foo', :serializer => BarSerializer do
+namespace 'foo', serializer: BarSerializer do
   get "/" do
     # will use "bar" serializer
   end
 
   # Options specified on a route or namespace override those of the containing namespace.
-  get "/home", :serializer => HomeSerializer do
+  get "/home", serializer: HomeSerializer do
     # will use "home" serializer
   end
 
   # All standard options for `ActiveModel::Serializers` are supported.
-  get "/fancy_homes", :root => 'world', :each_serializer => FancyHomesSerializer
+  get "/fancy_homes", root: 'world', each_serializer: FancyHomesSerializer
   ...
   end
 end
@@ -130,7 +130,7 @@ helper method:
 ```ruby
 helpers do
   def current_user
-    @current_user ||= User.where( :access_token => params[:token]).first
+    @current_user ||= User.where(access_token: params[:token]).first
   end
 
   def authenticate!
@@ -168,7 +168,7 @@ class API < Grape::API
   end
 end
 
-API.new.get "/home" # => '{:user=>{:first_name=>"JR", :last_name=>"HE"}}'
+API.new.get "/home" # => '{ user: { first_name: "JR", last_name: "HE" } }'
 ```
 
 
diff --git a/Rakefile b/Rakefile
index da5d3ba..a0298c6 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,5 +1,5 @@
 #!/usr/bin/env rake
-require "bundler/gem_tasks"
+require 'bundler/gem_tasks'
 
 require 'rspec/core'
 require 'rspec/core/rake_task'
@@ -8,4 +8,7 @@ RSpec::Core::RakeTask.new(:spec) do |spec|
   spec.pattern = FileList['spec/**/*_spec.rb']
 end
 
-task :default => :spec
\ No newline at end of file
+require 'rubocop/rake_task'
+RuboCop::RakeTask.new(:rubocop)
+
+task default: [:rubocop, :spec]
diff --git a/grape-active_model_serializers.gemspec b/grape-active_model_serializers.gemspec
index 21a209b..ec82ee5 100644
--- a/grape-active_model_serializers.gemspec
+++ b/grape-active_model_serializers.gemspec
@@ -2,25 +2,26 @@
 require File.expand_path('../lib/grape-active_model_serializers/version', __FILE__)
 
 Gem::Specification.new do |gem|
-  gem.authors       = ["Jonathan Richard Henry Evans"]
-  gem.email         = ["contact@jrhe.co.uk"]
-  gem.summary       = %q{Use active_model_serializer in grape}
-  gem.description   = %q{Provides a Formatter for the Grape API DSL to emit objects serialized with active_model_serializers.}
-  gem.homepage      = "https://github.com/jrhe/grape-active_model_serializers"
+  gem.authors       = ['Jonathan Richard Henry Evans']
+  gem.email         = ['contact@jrhe.co.uk']
+  gem.summary       = 'Use active_model_serializer in grape'
+  gem.description   = 'Provides a Formatter for the Grape API DSL to emit objects serialized with active_model_serializers.'
+  gem.homepage      = 'https://github.com/jrhe/grape-active_model_serializers'
 
-  gem.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+  gem.executables   = `git ls-files -- bin/*`.split("\n").map { |f| File.basename(f) }
   gem.files         = `git ls-files`.split("\n")
   gem.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
-  gem.name          = "grape-active_model_serializers"
-  gem.require_paths = ["lib"]
+  gem.name          = 'grape-active_model_serializers'
+  gem.require_paths = ['lib']
   gem.version       = Grape::ActiveModelSerializers::VERSION
   gem.licenses      = ['MIT']
 
-  gem.add_dependency "grape"
-  gem.add_dependency "active_model_serializers", ">= 0.9.0"
+  gem.add_dependency 'grape'
+  gem.add_dependency 'active_model_serializers', '>= 0.9.0'
 
-  gem.add_development_dependency "rspec"
-  gem.add_development_dependency "rack-test"
-  gem.add_development_dependency "rake"
-  gem.add_development_dependency "guard-rspec"
+  gem.add_development_dependency 'rspec'
+  gem.add_development_dependency 'rack-test'
+  gem.add_development_dependency 'rake'
+  gem.add_development_dependency 'guard-rspec'
+  gem.add_development_dependency 'rubocop', '0.28.0'
 end
diff --git a/lib/grape-active_model_serializers/endpoint_extension.rb b/lib/grape-active_model_serializers/endpoint_extension.rb
index d3b1d4a..9fa59e0 100644
--- a/lib/grape-active_model_serializers/endpoint_extension.rb
+++ b/lib/grape-active_model_serializers/endpoint_extension.rb
@@ -35,22 +35,18 @@ module Grape
       end
     end
 
-    def render(resources, meta={})
-      set_meta_and_meta_key(meta)
+    def render(resources, meta = {})
+      Formatter::ActiveModelSerializers.meta = meta[:meta]
+      Formatter::ActiveModelSerializers.meta_key = meta[:meta_key]
       resources
     end
 
-    def default_serializer_options; end
-
-    def url_options; end
-
-    private
-
-    def set_meta_and_meta_key(meta)
-      Formatter::ActiveModelSerializers.meta = meta[:meta]
-      Formatter::ActiveModelSerializers.meta_key = meta[:meta_key]
+    def default_serializer_options
     end
 
+    def url_options
+    end
   end
+
   Endpoint.send(:include, EndpointExtension)
 end
diff --git a/lib/grape-active_model_serializers/formatter.rb b/lib/grape-active_model_serializers/formatter.rb
index d20dc44..4398be3 100644
--- a/lib/grape-active_model_serializers/formatter.rb
+++ b/lib/grape-active_model_serializers/formatter.rb
@@ -16,12 +16,13 @@ module Grape
           endpoint = env['api.endpoint']
           options = build_options_from_endpoint(endpoint)
 
-          if serializer = options.fetch(:serializer, ActiveModel::Serializer.serializer_for(resource))
-            options[:scope] = endpoint unless options.has_key?(:scope)
-            # ensure we have an root to fallback on
-            options[:resource_name] = default_root(endpoint) if resource.respond_to?(:to_ary)
-            serializer.new(resource, options.merge(other_options))
-          end
+          serializer = options.fetch(:serializer, ActiveModel::Serializer.serializer_for(resource))
+          return nil unless serializer
+
+          options[:scope] = endpoint unless options.key?(:scope)
+          # ensure we have an root to fallback on
+          options[:resource_name] = default_root(endpoint) if resource.respond_to?(:to_ary)
+          serializer.new(resource, options.merge(other_options))
         end
 
         def other_options
@@ -57,10 +58,10 @@ module Grape
         # otherwise the route name (e.g. get 'name')
         def default_root(endpoint)
           innermost_scope = if endpoint.respond_to?(:namespace_stackable)
-            endpoint.namespace_stackable(:namespace).last
-          else
-            endpoint.settings.peek[:namespace]
-          end
+                              endpoint.namespace_stackable(:namespace).last
+                            else
+                              endpoint.settings.peek[:namespace]
+                            end
 
           if innermost_scope
             innermost_scope.space
diff --git a/spec/features/grape-active_model_serializers/render_spec.rb b/spec/features/grape-active_model_serializers/render_spec.rb
index 7523571..0d69f30 100644
--- a/spec/features/grape-active_model_serializers/render_spec.rb
+++ b/spec/features/grape-active_model_serializers/render_spec.rb
@@ -20,43 +20,40 @@ describe '#render' do
 
   context 'with meta key' do
     it 'includes meta key and content' do
-      result = get_resource_with({ meta: { total: 2 }})
+      result = get_resource_with(meta: { total: 2 })
       expect(result).to have_key('meta')
-      expect(result.fetch('meta')).to eq({ 'total' => 2 })
+      expect(result.fetch('meta')).to eq('total' => 2)
     end
   end
 
   context 'with a custom meta_key' do
-
     it 'includes the custom meta key name' do
-      result = get_resource_with({ meta: { total: 2 }, meta_key: :custom_key_name })
+      result = get_resource_with(meta: { total: 2 }, meta_key: :custom_key_name)
       expect(result).to have_key('custom_key_name')
-      expect(result.fetch('custom_key_name')).to eq({ 'total' => 2 })
+      expect(result.fetch('custom_key_name')).to eq('total' => 2)
     end
 
     it 'ignores a lonely meta_key' do
-      result = get_resource_with({ meta_key: :custom_key_name })
+      result = get_resource_with(meta_key: :custom_key_name)
       expect(result).not_to have_key('meta')
       expect(result).not_to have_key('custom_key_name')
     end
   end
 
   context 'junk keys' do
-
     it 'ignores junk keys' do
-      result = get_resource_with({ junk_key: { total: 2 } })
+      result = get_resource_with(junk_key: { total: 2 })
       expect(result).not_to have_key('junk_key')
     end
 
     it 'ignores empty meta_key' do
-      result = get_resource_with({ meta: { total: 2 }, meta_key: nil })
+      result = get_resource_with(meta: { total: 2 }, meta_key: nil)
       expect(result).to have_key('meta')
     end
 
     it 'ignores empty meta' do
-      result = get_resource_with({ meta: nil })
+      result = get_resource_with(meta: nil)
       expect(result).not_to have_key('meta')
     end
-
   end
 end
diff --git a/spec/grape-active_model_serializers/endpoint_extension_spec.rb b/spec/grape-active_model_serializers/endpoint_extension_spec.rb
index dec8151..142e84d 100644
--- a/spec/grape-active_model_serializers/endpoint_extension_spec.rb
+++ b/spec/grape-active_model_serializers/endpoint_extension_spec.rb
@@ -1,11 +1,10 @@
 require 'spec_helper'
 
 describe 'Grape::EndpointExtension' do
-
   if Grape::Util.const_defined?('InheritableSetting')
-    subject { Grape::Endpoint.new(Grape::Util::InheritableSetting.new, {path: '/', method: 'foo'}) }
+    subject { Grape::Endpoint.new(Grape::Util::InheritableSetting.new, path: '/', method: 'foo') }
   else
-    subject { Grape::Endpoint.new({}, {path: '/', method: 'foo'}) }
+    subject { Grape::Endpoint.new({}, path: '/', method: 'foo') }
   end
 
   let(:serializer) { Grape::Formatter::ActiveModelSerializers }
@@ -20,10 +19,10 @@ describe 'Grape::EndpointExtension' do
 
   let(:users) { [user, user] }
 
-  describe "#render" do
+  describe '#render' do
     it { should respond_to(:render) }
-    let (:meta_content) { { total: 2 } }
-    let (:meta_full) { { meta: meta_content } }
+    let(:meta_content) { { total: 2 } }
+    let(:meta_full) { { meta: meta_content } }
     context 'supplying meta' do
       it 'passes through the Resource and uses given meta settings' do
         expect(serializer).to receive(:meta=).with(meta_content)
@@ -31,7 +30,7 @@ describe 'Grape::EndpointExtension' do
       end
     end
     context 'supplying meta and key' do
-      let (:meta_key) { { meta_key: :custom_key_name } }
+      let(:meta_key) { { meta_key: :custom_key_name } }
       it 'passes through the Resource and uses given meta settings' do
         expect(serializer).to receive(:meta=).with(meta_content)
         expect(serializer).to receive(:meta_key=).with(meta_key[:meta_key])
@@ -39,5 +38,4 @@ describe 'Grape::EndpointExtension' do
       end
     end
   end
-
 end
diff --git a/spec/grape-active_model_serializers/formatter_spec.rb b/spec/grape-active_model_serializers/formatter_spec.rb
index 68c3edc..079bdbd 100644
--- a/spec/grape-active_model_serializers/formatter_spec.rb
+++ b/spec/grape-active_model_serializers/formatter_spec.rb
@@ -16,7 +16,7 @@ describe Grape::Formatter::ActiveModelSerializers do
 
     it 'will wrap valid input in the meta: {} wrapper' do
       subject.meta = { total: 2 }
-      expect(subject.meta).to eq({ meta: { total: 2 } })
+      expect(subject.meta).to eq(meta: { total: 2 })
     end
   end
 
@@ -28,7 +28,7 @@ describe Grape::Formatter::ActiveModelSerializers do
 
     it 'will wrap valid input in the meta_key: {} wrapper' do
       subject.meta_key = :custom_key_name
-      expect(subject.meta_key).to eq({ meta_key: :custom_key_name })
+      expect(subject.meta_key).to eq(meta_key: :custom_key_name)
     end
   end
 
@@ -36,9 +36,9 @@ describe Grape::Formatter::ActiveModelSerializers do
     let(:user) { User.new(first_name: 'John') }
 
     if Grape::Util.const_defined?('InheritableSetting')
-      let(:endpoint) { Grape::Endpoint.new(Grape::Util::InheritableSetting.new, {path: '/', method: 'foo'}) }
+      let(:endpoint) { Grape::Endpoint.new(Grape::Util::InheritableSetting.new, path: '/', method: 'foo') }
     else
-      let(:endpoint) { Grape::Endpoint.new({}, {path: '/', method: 'foo'}) }
+      let(:endpoint) { Grape::Endpoint.new({}, path: '/', method: 'foo') }
     end
 
     let(:env) { { 'api.endpoint' => endpoint } }
diff --git a/spec/grape-active_model_serializers_spec.rb b/spec/grape-active_model_serializers_spec.rb
index bc076ce..a642ad1 100644
--- a/spec/grape-active_model_serializers_spec.rb
+++ b/spec/grape-active_model_serializers_spec.rb
@@ -1,5 +1,4 @@
 require 'spec_helper'
 
 describe 'grape-active_model_serializers' do
-
 end
diff --git a/spec/old_grape_ams_spec.rb b/spec/old_grape_ams_spec.rb
index 28ce100..f4f6384 100644
--- a/spec/old_grape_ams_spec.rb
+++ b/spec/old_grape_ams_spec.rb
@@ -3,7 +3,7 @@ require 'support/models/user'
 require 'support/models/blog_post'
 require 'support/serializers/user_serializer'
 require 'support/serializers/blog_post_serializer'
-require "grape-active_model_serializers"
+require 'grape-active_model_serializers'
 
 describe Grape::ActiveModelSerializers do
   let(:app) { Class.new(Grape::API) }
@@ -14,79 +14,78 @@ describe Grape::ActiveModelSerializers do
     app.formatter :json, Grape::Formatter::ActiveModelSerializers
   end
 
-
-  it "should respond with proper content-type" do
-    app.get("/home/users", :serializer => UserSerializer) do
+  it 'should respond with proper content-type' do
+    app.get('/home/users', serializer: UserSerializer) do
       User.new
     end
-    get("/home/users")
-    expect(last_response.headers["Content-Type"]).to eql "application/json"
+    get('/home/users')
+    expect(last_response.headers['Content-Type']).to eql 'application/json'
   end
 
   context 'serializer is set to nil' do
     before do
-      app.get("/home", serializer: nil) do
-        {user: {first_name: "JR", last_name: "HE"}}
+      app.get('/home', serializer: nil) do
+        { user: { first_name: 'JR', last_name: 'HE' } }
       end
     end
     it 'uses the built in grape serializer' do
-      get("/home")
+      get('/home')
       expect(subject).to eql "{\"user\":{\"first_name\":\"JR\",\"last_name\":\"HE\"}}"
     end
   end
 
   context "serializer isn't set" do
     before do
-      app.get("/home") do
-        User.new({first_name: 'JR', last_name: 'HE', email: 'contact@jrhe.co.uk'})
+      app.get('/home') do
+        User.new(first_name: 'JR', last_name: 'HE', email: 'contact@jrhe.co.uk')
       end
     end
 
     it 'infers the serializer' do
-      get "/home"
+      get '/home'
       expect(subject).to eql "{\"user\":{\"first_name\":\"JR\",\"last_name\":\"HE\"}}"
     end
   end
 
-  it "serializes arrays of objects" do
-    app.get("/users") do
-      user = User.new({first_name: 'JR', last_name: 'HE', email: 'contact@jrhe.co.uk'})
+  it 'serializes arrays of objects' do
+    app.get('/users') do
+      user = User.new(first_name: 'JR', last_name: 'HE', email: 'contact@jrhe.co.uk')
       [user, user]
     end
 
-    get "/users"
+    get '/users'
     expect(subject).to eql "{\"users\":[{\"first_name\":\"JR\",\"last_name\":\"HE\"},{\"first_name\":\"JR\",\"last_name\":\"HE\"}]}"
   end
 
-  context "models with compound names" do
+  context 'models with compound names' do
     it "generates the proper 'root' node for individual objects" do
-      app.get("/home") do
-        BlogPost.new({title: 'Grape AM::S Rocks!', body: 'Really, it does.'})
+      app.get('/home') do
+        BlogPost.new(title: 'Grape AM::S Rocks!', body: 'Really, it does.')
       end
 
-      get "/home"
+      get '/home'
       expect(subject).to eql "{\"blog_post\":{\"title\":\"Grape AM::S Rocks!\",\"body\":\"Really, it does.\"}}"
     end
 
     it "generates the proper 'root' node for serialized arrays" do
-      app.get("/blog_posts") do
-        blog_post = BlogPost.new({title: 'Grape AM::S Rocks!', body: 'Really, it does.'})
+      app.get('/blog_posts') do
+        blog_post = BlogPost.new(title: 'Grape AM::S Rocks!', body: 'Really, it does.')
         [blog_post, blog_post]
       end
 
-      get "/blog_posts"
+      get '/blog_posts'
       expect(subject).to eql "{\"blog_posts\":[{\"title\":\"Grape AM::S Rocks!\",\"body\":\"Really, it does.\"},{\"title\":\"Grape AM::S Rocks!\",\"body\":\"Really, it does.\"}]}"
     end
   end
 
-  it "uses namespace options when provided" do
-    app.namespace :admin, :serializer => UserSerializer do
+  it 'uses namespace options when provided' do
+    app.namespace :admin, serializer: UserSerializer do
       get('/jeff') do
         User.new(first_name: 'Jeff')
       end
     end
 
-    get "/admin/jeff"
+    get '/admin/jeff'
     expect(subject).to eql "{\"user\":{\"first_name\":\"Jeff\",\"last_name\":null}}"
   end
 
@@ -99,7 +98,7 @@ describe Grape::ActiveModelSerializers do
         end
       end
 
-      get "/admin/jeff"
+      get '/admin/jeff'
       expect(subject).to eql "{\"admin\":[{\"first_name\":\"Jeff\",\"last_name\":null},{\"first_name\":\"Jeff\",\"last_name\":null}]}"
     end
   end
@@ -111,9 +110,8 @@ describe Grape::ActiveModelSerializers do
         [user, user]
       end
 
-      get "/people"
+      get '/people'
       expect(subject).to eql "{\"people\":[{\"first_name\":\"Jeff\",\"last_name\":null},{\"first_name\":\"Jeff\",\"last_name\":null}]}"
     end
   end
 end
-
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 55f4181..8b1450f 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -4,9 +4,9 @@ $LOAD_PATH.unshift(File.dirname(__FILE__))
 require 'bundler'
 Bundler.setup :default, :test
 
-require "active_model_serializers"
+require 'active_model_serializers'
 require 'active_support/core_ext/hash/conversions'
-require "active_support/json"
+require 'active_support/json'
 require 'rspec'
 require 'rack/test'
 require 'grape-active_model_serializers'
@@ -15,4 +15,4 @@ RSpec.configure do |config|
   config.include Rack::Test::Methods
 end
 
-Dir["#{File.dirname(__FILE__)}/support/**/*.rb"].each {|f| require f}
+Dir["#{File.dirname(__FILE__)}/support/**/*.rb"].each { |f| require f }
diff --git a/spec/support/models/blog_post.rb b/spec/support/models/blog_post.rb
index 991f53f..4cd580a 100644
--- a/spec/support/models/blog_post.rb
+++ b/spec/support/models/blog_post.rb
@@ -2,8 +2,8 @@ class BlogPost
   include ActiveModel::SerializerSupport
   attr_accessor :title, :body
 
-  def initialize(params={})
-    params.each do |k,v|
+  def initialize(params = {})
+    params.each do |k, v|
       instance_variable_set("@#{k}", v) unless v.nil?
     end
   end
diff --git a/spec/support/models/user.rb b/spec/support/models/user.rb
index 8e6b6b8..7b84800 100644
--- a/spec/support/models/user.rb
+++ b/spec/support/models/user.rb
@@ -2,8 +2,8 @@ class User
   include ActiveModel::SerializerSupport
   attr_accessor :first_name, :last_name, :password, :email
 
-  def initialize(params={})
-    params.each do |k,v|
+  def initialize(params = {})
+    params.each do |k, v|
       instance_variable_set("@#{k}", v) unless v.nil?
     end
   end