My fix for local database definition in rails

rails.rb

namespace :db do
  def local_database?(config, &block)
    if config['host'].in?(['127.0.0.1', 'localhost', '192.168.30.1']) || config['host'].blank?
      yield
    else
      $stderr.puts "This task only modifies local databases. #{config['database']} is on a remote host."
    end
  end
end

FYI

# config/application.rb
ActiveRecord::Tasks::DatabaseTasks::LOCAL_HOSTS << "192.168.99.100" # <-- IP of your docker-host

also works (tested in rails 4.2).

Thanks! 👍

Thank you!