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, 5 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/railtie.rb b/activerecord/lib/active_record/railtie.rb
index c2e31579a4..71772529d2 100644
--- a/activerecord/lib/active_record/railtie.rb
+++ b/activerecord/lib/active_record/railtie.rb
@@ -94,6 +94,11 @@ module ActiveRecord
       end
     end
 
+    initializer "active_record.add_watchable_files" do |app|
+      files = ["#{app.root}/db/schema.rb", "#{app.root}/db/structure.sql"]
+      config.watchable_files.concat files.select { |f| File.exist?(f) }
+    end
+
     config.after_initialize do
       ActiveSupport.on_load(:active_record) do
         instantiate_observers