Rubocop

lib/paperclip.rb

@@ -344,6 +344,6 @@ end
 
 # Set it all up.
 if Object.const_defined?("ActiveRecord")
-  ActiveRecord::Base.include(Paperclip)
+  ActiveSupport.on_load(:active_record) { include Paperclip }
   File.include(Paperclip::Upfile)
 end

lib/paperclip/callback_compatability.rb

@@ -15,11 +15,11 @@ module Paperclip
       def define_paperclip_callbacks(*callbacks)
         define_callbacks(*callbacks.flatten, {})
         callbacks.map(&:to_sym).each do |callback|
-          define_singleton_method "before_#{callback}" do |*args, &blk|
+          define_singleton_method :"before_#{callback}" do |*args, &blk|
             set_callback(callback, :before, *args, &blk)
           end
 
-          define_singleton_method "after_#{callback}" do |*args, &blk|
+          define_singleton_method :"after_#{callback}" do |*args, &blk|
             set_callback(callback, :after, *args, &blk)
           end
         end

test/attachment_test.rb

@@ -140,7 +140,11 @@ class AttachmentTest < Test::Unit::TestCase
         Tempfile.create do |tempfile|
           content = "file contents"
           tempfile.write(content)
-          upload = { 'original_name' => 'foo.jpg', 'content_type' => 'application/jpg', 'filepath' => tempfile.tap(&:rewind).path }
+          upload = {
+            'original_name' => 'foo.jpg',
+            'content_type' => 'application/jpg',
+            'filepath' => tempfile.tap(&:rewind).path
+          }
           @attachment.assign(upload)
           assert_equal "foo.png", @attachment.path
           assert_equal content, @attachment.queued_for_write[:original].tap(&:rewind).read

test/matchers/validate_attachment_content_type_matcher_test.rb

@@ -29,8 +29,16 @@ class ValidateAttachmentContentTypeMatcherTest < Test::Unit::TestCase
 
     should "have messages" do
       assert_equal "validate the content types allowed on attachment avatar", @matcher.description
-      assert_equal "Content types image/png, image/jpeg should be accepted and audio/mp3, application/octet-stream rejected by avatar", @matcher.failure_message
-      assert_equal "Content types image/png, image/jpeg should be rejected and audio/mp3, application/octet-stream accepted by avatar", @matcher.negative_failure_message
+      assert_equal(
+        "Content types image/png, image/jpeg should be accepted and audio/mp3, " \
+        "application/octet-stream rejected by avatar",
+        @matcher.failure_message
+      )
+      assert_equal(
+        "Content types image/png, image/jpeg should be rejected and audio/mp3, " \
+        "application/octet-stream accepted by avatar",
+        @matcher.negative_failure_message
+      )
     end
   end
 end

test/paperclip_test.rb

@@ -110,7 +110,7 @@ class PaperclipTest < Test::Unit::TestCase
 
     context "a validation with an if guard clause" do
       setup do
-        Dummy.send(:validates_attachment_presence, :avatar, :if => lambda{|i| i.foo })
+        Dummy.send(:validates_attachment_presence, :avatar, if: ->(i) { i.foo })
         @dummy = Dummy.new
       end
 
@@ -129,7 +129,7 @@ class PaperclipTest < Test::Unit::TestCase
 
     context "a validation with an unless guard clause" do
       setup do
-        Dummy.send(:validates_attachment_presence, :avatar, :unless => lambda{|i| i.foo })
+        Dummy.send(:validates_attachment_presence, :avatar, unless: ->(i) { i.foo })
         @dummy = Dummy.new
       end
 

test/railtie_test.rb

@@ -5,7 +5,7 @@ require 'test_helper'
 class RailtieTest < Test::Unit::TestCase
   should "load processors" do
     FileUtils.mkdir_p('tmp/rails/lib/paperclip_processors')
-    File.write(Rails.root.join('lib/paperclip_processors/some_custom_processor.rb'), <<~RUBY)
+    Rails.root.join('lib/paperclip_processors/some_custom_processor.rb').write <<~RUBY
       class Paperclip::SomeCustomProcessor < Paperclip::Processor
       end
     RUBY

test/recursive_thumbnail_test.rb

@@ -25,7 +25,9 @@ class RecursiveThumbnailTest < Test::Unit::TestCase
     style_file.expects(:close!).once
     @original_file.expects(:close!).never
     @attachment.expects(:to_file).with(:existent).returns(style_file)
-    processor = Paperclip::RecursiveThumbnail.new(@original_file, { thumbnail: :existent, geometry: '1x1'}, @attachment)
+    processor = Paperclip::RecursiveThumbnail.new(
+      @original_file, { thumbnail: :existent, geometry: '1x1' }, @attachment
+    )
     Paperclip.stubs run: ""
     assert_equal style_file, processor.file
     res = processor.make

test/test_helper.rb

@@ -100,8 +100,7 @@ def rebuild_class(options = {})
 end
 
 class FakeModel
-  def self.set_callback(...)
-  end
+  def self.set_callback(...); end
 
   include Paperclip
 

test/upfile_test.rb

@@ -28,11 +28,10 @@ class UpfileTest < Test::Unit::TestCase
       '_.html' => 'text/html',
       '__.htm' => 'text/html',
 
-
       "_.txt" => "text/plain",
       "_.liquid" => "text/x-liquid",
       '_.svg' => 'image/svg+xml',
-      '_.xls' => 'application/vnd.ms-excel',
+      '_.xls' => 'application/vnd.ms-excel'
     }.each_pair do |example, result|
       should "return #{result} for #{example}" do
         assert_equal result, Paperclip::Upfile.content_type_from_ext(example)