Speed up development by only reloading classes if dependencies files changed.

This can be turned off by setting `config.reload_classes_only_on_change` to false.

Extensions like Active Record should add their respective files like db/schema.rb and db/structure.sql to `config.watchable_files` if they want their changes to affect classes reloading.

Thanks to https://github.com/paneq/active_reload and Pastorino for the inspiration. <3

1 files changed, 9 insertions, 0 deletions

diff --git a/actionpack/test/dispatch/reloader_test.rb b/actionpack/test/dispatch/reloader_test.rb
index bd24256427..3411bd14ea 100644
--- a/actionpack/test/dispatch/reloader_test.rb
+++ b/actionpack/test/dispatch/reloader_test.rb
@@ -129,6 +129,15 @@ class ReloaderTest < Test::Unit::TestCase
     assert cleaned
   end
 
+  def test_prepend_prepare_callback
+    i = 10
+    Reloader.to_prepare { i += 1 }
+    Reloader.to_prepare(:prepend => true) { i = 0 }
+
+    Reloader.prepare!
+    assert_equal 1, i
+  end
+
   def test_cleanup_callbacks_are_called_on_exceptions
     cleaned = false
     Reloader.to_cleanup { cleaned  = true }