Ransack with Polymorphic Relationships

_search.html.erb

<%= search_form_for(@report.search, :url => report_path('sales', 'by_contact')) do |f| %>
  <div class="input string optional">
    <%= f.label :aggregator_of_User_type_name_eq, 'Name' %>
    <%= f.text_field :aggregator_of_User_type_name_eq %>
  </div>
    
  <%= f.submit %>
<% end %>

sale.rb

class Sale < ActiveRecord::Base
  
  #associations
    belongs_to :aggregator, :polymorphic => true
end

stack trace

uninitialized constant Kernel::Product_type_name_cont_before

3:   <%= search_form_for(@report.search, :url => report_path('sales', 'by_contact')) do |f| %>
4:     <div class="input string optional">
5:       <%= f.label :aggregator_of_Product_type_name_cont, 'Name' %>
6:       <%= f.text_field :aggregator_of_Product_type_name_cont %>
7:     </div>
8:     
9:     <%= f.submit %>

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