Load plugin initializers from lib/rails/initializers/*.rb

railties/lib/rails/plugin.rb

@@ -47,13 +47,20 @@ def config
     end
 
     initializer :load_init_rb, :before => :load_application_initializers do |app|
-      files = %w(rails/init.rb init.rb).map { |path| File.expand_path path, root }
-      if initrb = files.find { |path| File.file? path }
-        if initrb == files.first
-          ActiveSupport::Deprecation.warn "Use toplevel init.rb; rails/init.rb is deprecated: #{initrb}"
+      initializers = Dir["#{root}/lib/rails/initializers/*.rb"]
+
+      if initializers.any?
+        initializers.each do |initializer|
+          config = app.config
+          eval(File.read(initializer), binding, initializer)
+        end
+      else
+        files = %w(rails/init.rb init.rb).map { |path| File.expand_path path, root }
+        if initrb = files.find { |path| File.file? path }
+          ActiveSupport::Deprecation.warn "init.rb is deprecated: #{initrb}. Use lib/rails/initializers/#{name}.rb"
+          config = app.config
+          eval(File.read(initrb), binding, initrb)
         end
-        config = app.config
-        eval(File.read(initrb), binding, initrb)
       end
     end
 

railties/test/railties/plugin_test.rb

@@ -94,6 +94,39 @@ class Engine < Rails::Engine
       assert rescued, "Expected boot rails to fail"
     end
 
+    test "loads lib/rails/initializers/foo.rb" do
+      @plugin.write "lib/rails/initializers/foo.rb", <<-RUBY
+        $loaded = true
+      RUBY
+
+      boot_rails
+      assert $loaded
+    end
+
+    test "loads vendored rails/initializers/foo thats already in the $LOAD_PATH" do
+      $: << "#{app_path}/vendor/foo/lib"
+
+      app_file "vendor/foo/lib/rails/initializers/foo.rb", <<-RUBY
+        $loaded = true
+      RUBY
+
+      boot_rails
+      assert $loaded
+    end
+
+    test "skips init.rb if initializer is present" do
+      @plugin.write "lib/rails/initializers/foo.rb", <<-RUBY
+        $loaded = true
+      RUBY
+
+      @plugin.write "init.rb", <<-RUBY
+        raise "b00m"
+      RUBY
+
+      boot_rails
+      assert $loaded
+    end
+
     test "loads deprecated rails/init.rb" do
       @plugin.write "rails/init.rb", <<-RUBY
         $loaded = true