Adding a local thread registry to store local caches.
adding a test for root path in the app
Merge pull request #10250 from wangjohn/local_cache_registry

Adding a local thread registry to store local caches.
add :nodoc: mark to *Registry classes [ci skip]
Add nodoc to LocalCacheRegistry

[ci skip]
Merge pull request #10252 from epiclabs/nodoc_registries

add :nodoc: mark to *Registry classes [ci skip]
activerecord-deprecated_finders 1.0.0 has a bug with has_many :through
associations