Ransack search not working if there is 'space' in search term

Ransack search not working if there is 'space' in search term

I am using ransack for search in my rails 3.2 application using postgres
as database.
I have a Invoice model and every invoice belongs_to a buyer. Below is my
search form in index page.
views/invoices/index.html.erb
<%= search_form_for @search do |f| %>
<%= f.text_field :buyer_name_cont %>
<%= f.submit "Search"%>
<% end %>
And here is my controller code.
controllers/invoices_controller.rb
def index
@search = Invoice.search(params[:q])
@invoices=@search.result(:distinct => true).paginate(:page =>
params[:page], :per_page => GlobalConstants::PER_PAGE )
respond_to do |format|
format.html # index.html.erb
format.json { render json: @invoices }
end
end
Let's say a invoice is there of a buyer having name "Bat Man".
If I search "Bat", I get the invoice in results. Again if I search "Man",
I get the invoice in results. But if I search "Bat Man", I don't get the
invoice in results.
I know it might be something trivial but I am not able to resolve.
Please help.
Thanks.