gistfile1.txt

Configuration.all.each do |configuration|
  begin
    User.find(configuration.user_id)
  rescue
    user_id = configuration.user_id
    Configuration.where(user_id: user_id).delete_all
    Client.where(user_id: user_id).delete_all
    Order.where(user_id: user_id).delete_all
    Product.where(user_id: user_id).delete_all
    Topmail.where(user_id: user_id).delete_all
    Label.where(user_id: user_id).delete_all
  end
end

ids = []
Client.all.each do |c|
  begin
    User.find(c.user_id)
  rescue
    ids << c.id
  end
end