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-rw-r--r--railties/lib/rails/commands/server/server_command.rb9
1 files changed, 8 insertions, 1 deletions
diff --git a/railties/lib/rails/commands/server/server_command.rb b/railties/lib/rails/commands/server/server_command.rb
index ce258341f6..de69b4586b 100644
--- a/railties/lib/rails/commands/server/server_command.rb
+++ b/railties/lib/rails/commands/server/server_command.rb
@@ -2,6 +2,8 @@ require "fileutils"
require "optparse"
require "action_dispatch"
require "rails"
+require "active_support/deprecation"
+require "active_support/core_ext/string/filters"
require_relative "../../dev_caching"
module Rails
@@ -18,10 +20,15 @@ module Rails
set_environment
end
- # TODO: this is no longer required but we keep it for the moment to support older config.ru files.
def app
@app ||= begin
app = super
+ if app.is_a?(Class)
+ ActiveSupport::Deprecation.warn(<<-MSG.squish)
+ Use `Rails::Application` subclass to start the server is deprecated and will be removed in Rails 6.0.
+ Please change `run #{app}` to `run Rails.application` in config.ru.
+ MSG
+ end
app.respond_to?(:to_app) ? app.to_app : app
end
end