Send multiple invitation using devise-invitable gemin rails

i want to send multiple invitation at a time using devise-invitable gem.

my view :- new.html.erb

 <h2><%= t "devise.invitations.new.header" %></h2>

<%= form_for resource, :as => resource_name, :url => invitation_path(resource_name), :html => {:method => :post} do |f| %>
  <%= devise_error_messages! %>
  <div>
    <% resource.class.invite_key_fields.each do |field| -%>
      <p><%= f.label field %><br />
      <%= f.email_field field, placeholder: "Invitation email" %></p>
    <% end -%>
    <%= f.collection_select(:role_id, Role.all, :id, :role_name, :prompt => true)  %>
  </div>
  <p><%= f.submit t("devise.invitations.new.submit_button") %></p>
<% end %>

my controller:-

class Users::InvitationsController < Devise::InvitationsController
def create
    exit
    if params[:user][:email]== "" || params[:user][:role_id] == ""
        flash[:alert]="Please enter email first and Select any role for invitees"
        redirect_to new_user_invitation_path
    else
        if User.invite!(:email => params[:user][:email], :company_id => current_user.id, :type => 'Employee', :role_id => params[:user][:role_id])
            flash[:notice]="Invitation is send successfully."
            redirect_to new_user_invitation_path
        else
            flash[:alert]="Invitation is not send."
            redirect_to new_user_invitation_path
        end
    end
end
end

i think one solution is to pass coma separated emails in invite! method but how can i pass it i really don't know.

if you have any other solution then please tell me.

thanks..