I get the following warning with Rails 4 and Sidekiq on os x on development
10:13:39 worker.1 | 2014-09-22T07:13:39.857Z 86981 TID-oug0oog10 WARN: could not
I set database pool to sidekiq concurrency and now it works for me.
bundle exec sidekiq -c 10
in my database.yml
development: adapter: postgresql ... host: localhost pool: 10