How to upload in a specific folder in rails ?

Hello community,

I want to upload in a specific folder my photos, i'm using simple form but i dont understand her t o write the path to my cloudinary folder ..

thanks for your help 

<%= simple_form_for(@product) do |f| %>
<%= f.input :name %>
<%= f.input :price %>
<%= f.input :size %>
<%= f.input :description %>
<%= f.input :category, label: "Catégorie", collection: Product::CATEGORY %>
<%= f.input :photo, as: :file do %>
<%= cl_image_upload_tag(:folder => "tricot-by-lolo") %>
<% end %>
<%= f.submit "Add this product", class: "btn btn-primary", id:'add-button' %>
<% end %>