Rake task to disconnect postgres db

db_disconnect.rake

namespace :db do
  desc "Drop postgresql db connections"
  task :disconnect => :environment do
    begin
      ActiveRecord::Base.connection.select_all("select * from pg_stat_activity order by procpid;").each do |x|
        ActiveRecord::Base.connection.execute("select pg_terminate_backend(#{x['procpid']})")
      end
    rescue
    end
    puts "DB sessions disconnected."
  end
end