render specific partial

dynamic_view_paths.rb

before_filter :set_view_paths

def index
end

private

def set_view_paths
  prepend_view_path 'projects/override'
end

# "/Users/rodolfo/Desktop/calendar_room/projects/override/shared/_flash_message{.en,}{.html,}{}{.erb,.builder,.raw,.ruby,.jbuilder,}"
# https://github.com/rails/rails/issues/12973

view_paths.rb

# config/initializers/view_paths.rb
# EXTENSIONS = { :locale => ".", :formats => ".", :variants => "+", :handlers => "." }
# DEFAULT_PATTERN = ":prefix/:action{.:locale,}{.:formats,}{+:variants,}{.:handlers,}"


ActionController::Base.view_paths = ActionView::FileSystemResolver.new(
  Rails.root.join('app/views'),
  ":prefix/{#{ENV[CORE_PATH]}/,}:action{.:locale,}{.:formats,}{+:variants,}{.:handlers,}"
)