def set_user_admin
    if admin_true? == true
      user = User.find(params[:format])
      if user == nil
        redirect_to managements_path
      else
        user.update_attributes(admin: true, assistant: true,
          businessman: true)
        redirect_to managements_path
        flash[:notice] = "The user #{user.name} is an admin user now"
      end
    else
    end
  end

u = User.find_by_id(3)
u.update_attributes(admin: true)
(0.1ms)  rollback transaction
=> false
u.errors
@messages={:password=>["Choose a password", "Your password must be at least 4 characters
"], :password_confirmation=>["You must confirm your password
"]}