#345: fixed: could not obtain a database connection within 5.000 seconds

config/application.rb

@@ -14,6 +14,11 @@ module Rosa
   class Application < Rails::Application
     config.i18n.enforce_available_locales = true
 
+    unless Rails.env.test?
+      require 'close_ar_connections_middleware'
+      config.middleware.insert_after('Rack::Sendfile', CloseArConnectionsMiddleware)
+    end
+
     # Rate limit
     config.middleware.insert_before Rack::Runtime, ApiDefender
 

lib/close_ar_connections_middleware.rb

@@ -0,0 +1,12 @@
+# "Coffee's for closers"
+class CloseArConnectionsMiddleware
+  def initialize(app)
+    @app = app
+  end
+
+  def call(env)
+    @app.call(env)
+  ensure
+    ActiveRecord::Base.clear_active_connections! unless env.key?('rack.test')
+  end
+end