make rake proxy work in rails engines

activerecord/lib/active_record/railtie.rb

@@ -40,7 +40,7 @@ class Railtie < Rails::Railtie # :nodoc:
         task :load_config do
           ActiveRecord::Tasks::DatabaseTasks.database_configuration = Rails.application.config.database_configuration
 
-          if defined?(ENGINE_PATH) && engine = Rails::Engine.find(ENGINE_PATH)
+          if defined?(ENGINE_ROOT) && engine = Rails::Engine.find(ENGINE_ROOT)
             if engine.paths['db/migrate'].existent
               ActiveRecord::Tasks::DatabaseTasks.migrations_paths += engine.paths['db/migrate'].to_a
             end

railties/lib/rails/engine/commands.rb

@@ -1,3 +1,5 @@
+require 'rails/engine/commands_tasks'
+
 ARGV << '--help' if ARGV.empty?
 
 aliases = {
@@ -9,35 +11,4 @@
 command = ARGV.shift
 command = aliases[command] || command
 
-require ENGINE_PATH
-engine = ::Rails::Engine.find(ENGINE_ROOT)
-
-case command
-when 'generate', 'destroy', 'test'
-  require 'rails/generators'
-  Rails::Generators.namespace = engine.railtie_namespace
-  engine.load_generators
-  require "rails/commands/#{command}"
-
-when '--version', '-v'
-  ARGV.unshift '--version'
-  require 'rails/commands/application'
-
-else
-  puts "Error: Command not recognized" unless %w(-h --help).include?(command)
-  puts <<-EOT
-Usage: rails COMMAND [ARGS]
-
-The common Rails commands available for engines are:
- generate    Generate new code (short-cut alias: "g")
- destroy     Undo code generated with "generate" (short-cut alias: "d")
- test        Run tests (short-cut alias: "t")
-
-All commands can be run with -h for more information.
-
-If you want to run any commands that need to be run in context
-of the application, like `rails server` or `rails console`,
-you should do it from application's directory (typically test/dummy).
-  EOT
-  exit(1)
-end
+Rails::Engine::CommandsTasks.new(ARGV).run_command!(command)

railties/lib/rails/engine/commands_tasks.rb

@@ -0,0 +1,116 @@
+require 'rails/commands/rake_proxy'
+
+module Rails
+  class Engine
+    class CommandsTasks # :nodoc:
+      include Rails::RakeProxy
+
+      attr_reader :argv
+
+      HELP_MESSAGE = <<-EOT
+Usage: rails COMMAND [ARGS]
+
+The common Rails commands available for engines are:
+ generate    Generate new code (short-cut alias: "g")
+ destroy     Undo code generated with "generate" (short-cut alias: "d")
+ test        Run tests (short-cut alias: "t")
+
+All commands can be run with -h for more information.
+
+If you want to run any commands that need to be run in context
+of the application, like `rails server` or `rails console`,
+you should do it from application's directory (typically test/dummy).
+
+In addition to those commands, there are:
+  EOT
+
+      COMMAND_WHITELIST = %w(generate destroy version help test)
+
+      def initialize(argv)
+        @argv = argv
+      end
+
+      def run_command!(command)
+        command = parse_command(command)
+
+        if COMMAND_WHITELIST.include?(command)
+          send(command)
+        else
+          run_rake_task(command)
+        end
+      end
+
+      def generate
+        generate_or_destroy(:generate)
+      end
+
+      def destroy
+        generate_or_destroy(:destroy)
+      end
+
+      def test
+        require_command!("test")
+      end
+
+      def version
+        argv.unshift '--version'
+        require_command!("application")
+      end
+
+      def help
+        write_help_message
+        write_commands(formatted_rake_tasks)
+      end
+
+      private
+
+        def require_command!(command)
+          require "rails/commands/#{command}"
+        end
+
+        def generate_or_destroy(command)
+          load_generators
+          require_command!(command)
+        end
+
+        def load_generators
+          require 'rails/generators'
+          require ENGINE_PATH
+
+          engine = ::Rails::Engine.find(ENGINE_ROOT)
+          Rails::Generators.namespace = engine.railtie_namespace
+          engine.load_generators
+        end
+
+        def write_help_message
+          puts HELP_MESSAGE
+        end
+
+        def write_commands(commands)
+          width = commands.map { |name, _| name.size }.max || 10
+          commands.each { |command| printf(" %-#{width}s   %s\n", *command) }
+        end
+
+        def parse_command(command)
+          case command
+          when '--version', '-v'
+            'version'
+          when '--help', '-h'
+            'help'
+          else
+            command
+          end
+        end
+
+        def rake_tasks
+          return @rake_tasks if defined?(@rake_tasks)
+
+          load_generators
+          Rake::TaskManager.record_task_metadata = true
+          Rake.application.init('rails')
+          Rake.application.load_rakefile
+          @rake_tasks = Rake.application.tasks.select(&:comment)
+        end
+    end
+  end
+end

railties/lib/rails/tasks/engine.rake

@@ -4,8 +4,8 @@ task "load_app" do
   end
   task :environment => "app:environment"
 
-  if !defined?(ENGINE_PATH) || !ENGINE_PATH
-    ENGINE_PATH = find_engine_path(APP_RAKEFILE)
+  if !defined?(ENGINE_ROOT) || !ENGINE_ROOT
+    ENGINE_ROOT = find_engine_path(APP_RAKEFILE)
   end
 end
 

railties/test/generators/plugin_generator_test.rb

@@ -240,7 +240,7 @@ def test_ensure_that_migration_tasks_work_with_mountable_option
     run_generator [destination_root, "--mountable"]
     FileUtils.cd destination_root
     quietly { system 'bundle install' }
-    output = `bundle exec rake db:migrate 2>&1`
+    output = `bin/rails db:migrate 2>&1`
     assert $?.success?, "Command failed: #{output}"
   end
 

railties/test/generators/scaffold_generator_test.rb

@@ -486,7 +486,7 @@ def test_scaffold_tests_pass_by_default_inside_mountable_engine
     Dir.chdir(engine_path) do
       quietly do
         `bin/rails g scaffold User name:string age:integer;
-        bundle exec rake db:migrate`
+        bin/rails db:migrate`
       end
       assert_match(/8 runs, 13 assertions, 0 failures, 0 errors/, `bin/rails test 2>&1`)
     end
@@ -500,7 +500,7 @@ def test_scaffold_tests_pass_by_default_inside_full_engine
     Dir.chdir(engine_path) do
       quietly do
         `bin/rails g scaffold User name:string age:integer;
-        bundle exec rake db:migrate`
+        bin/rails db:migrate`
       end
       assert_match(/8 runs, 13 assertions, 0 failures, 0 errors/, `bin/rails test 2>&1`)
     end
@@ -514,7 +514,7 @@ def test_scaffold_tests_pass_by_default_inside_api_mountable_engine
     Dir.chdir(engine_path) do
       quietly do
         `bin/rails g scaffold User name:string age:integer;
-        bundle exec rake db:migrate`
+        bin/rails db:migrate`
       end
       assert_match(/6 runs, 8 assertions, 0 failures, 0 errors/, `bin/rails test 2>&1`)
     end
@@ -528,7 +528,7 @@ def test_scaffold_tests_pass_by_default_inside_api_full_engine
     Dir.chdir(engine_path) do
       quietly do
         `bin/rails g scaffold User name:string age:integer;
-        bundle exec rake db:migrate`
+        bin/rails db:migrate`
       end
       assert_match(/6 runs, 8 assertions, 0 failures, 0 errors/, `bin/rails test 2>&1`)
     end