Prettify generators description whenever using the default stack [#4143 status:resolved]

railties/lib/rails/generators.rb

@@ -202,6 +202,10 @@ def self.help(command = 'generate')
       rails.delete("app")
       print_list("rails", rails)
 
+      groups.delete("active_record") if options[:rails][:orm] == :active_record
+      groups.delete("test_unit")     if options[:rails][:test_framework] == :test_unit
+      groups.delete("erb")           if options[:rails][:template_engine] == :erb
+
       groups.sort.each { |b, n| print_list(b, n) }
     end
 

railties/test/generators_test.rb

@@ -104,11 +104,25 @@ def test_rails_generators_help_with_builtin_information
 
   def test_rails_generators_with_others_information
     output = capture(:stdout){ Rails::Generators.help }
-    assert_match /ActiveRecord:/, output
     assert_match /Fixjour:/, output
+    assert_match /^  fixjour$/, output
+  end
+
+  def test_rails_generators_does_not_show_activerecord_info_if_its_the_default
+    output = capture(:stdout){ Rails::Generators.help }
+    assert_no_match /ActiveRecord:/, output
+    assert_no_match /^  active_record:model$/, output
+    assert_no_match /^  active_record:fixjour$/, output
+  end
+
+  def test_rails_generators_shows_activerecord_info_if_its_not_the_default
+    Rails::Generators.options[:rails][:orm] = :data_mapper
+    output = capture(:stdout){ Rails::Generators.help }
+    assert_match /ActiveRecord:/, output
     assert_match /^  active_record:model$/, output
     assert_match /^  active_record:fixjour$/, output
-    assert_match /^  fixjour$/, output
+  ensure
+    Rails::Generators.options[:rails][:orm] = :active_record
   end
 
   def test_no_color_sets_proper_shell