I have two check boxes, i need any of the check box should be checked to proced

here is my _form.html.haml* I have two check boxs **:is_sales_report_visible :is_invoice_visible I need any of the check box must be checked to update the user please help me out how to make it possible Thanks in advance*

= form_for(@employee , html: {class: 'form-horizontal', role: 'form' }) do |f|
  - if @employee.errors.any?
    #error_explanation
      %h2
        = pluralize(@employee.errors.count, "error")
        prohibited this employee from being saved:
      %ul
        - @employee.errors.full_messages.each do |message|
          %li
            = message
  .field
    = f.label "email", :class => 'control-label'
    .controls
      = f.text_field "email",input_html: { :class => 'text_field'} , :required => true,  :placeholder =>'Please enter a valid email address'
      .field
  = f.label :"first_name","First Name", :class => 'control-label'
  .controls
    = f.text_field :"first_name", input_html: { :class => 'text_field' }, :required => true, :maxlength => 15, :placeholder =>'Enter First Name '
    .field
  = f.label :"last_name","Last Name",:class => 'control-label'
  .controls
    = f.text_field :"last_name", input_html: { :class => 'text_field' },:required => true, :maxlength => 15, :placeholder =>'Enter Last Name '
    .field
  = f.label :"password","Password", :class => 'control-label'
  .controls
    = f.password_field :"password", input_html: { :class => 'password_field' },:required => true, :maxlength => 15, :placeholder =>'Enter Password'
    .field
  = f.label :"password_confirmation","Password Confirmation", :class => 'control-label'
  .controls
    = f.password_field :"password_confirmation", input_html: { :class => 'password_field' },:required => true, :maxlength => 15, :placeholder =>'Enter Password Confimation'
  .field
    = f.label :role,"Role", :class => 'control-label'
    .controls
    = f.collection_select(:role_id, Role.all, :id, :role_name, prompt: "Select1")
  .field
    = f.label :is_sales_report_visible," Visible Factory Sales", :class => 'control-label'
    .controls
    = f.check_box :is_sales_report_visible, {}, true, false
    .field 
    = f.label :is_invoice_visible," Visible Invoice Details", :class => 'control-label'
    .controls
    = f.check_box :is_invoice_visible{}, true, false
  .form-actions1
    = f.submit :class => 'btn btn-primary btn-md'
    = link_to "Cancel", employees_path(), :class => 'btn btn-danger', data: { confirm: 'Are you sure you want to cancel' }