Undefined method "cmdb_searches_path" for form_for in index

I have an cmdbs_controller.rb inside of which i have index and defined cmdb resource route

def index
    @cisearch = CmdbSearch.new
  end

Also i have a cmdb_search model which is the model for search form (empty). In my index.html.erb I want to load form_for like that:

<%= form_for @cisearch, remote:true  do |f| %>
...some code..           
<% end %>

I have done such search for other page before, but for now i get an error:

undefined method `cmdb_searches_path'