• Change config.yml.erb db_writer: need_to_set_as_sequel describe. ~/p/r/c/dashboard (master) [1]> RAILS_ENV=production bundle exec rails assets:precompile rails aborted! NoMethodError: undefined method to_sym' for nil:NilClass /Users/lanezhang/projects/ruby/code-dot-org-staging/lib/cdo/db.rb:76:in sequel_connect’