I have a form that is using form_tag and not sure how to use it with the simple_form gem. This is how my form looks:
<%= form_tag create_mult
like @barelyknown said You can use simple_form even without model
You can also use field_for or simple_field_for
<%= simple_form_for :transaction_limits, {url: create_multiple_prices_path, method: :post} do |f| %>
<% @prices.each_with_index do |price, index| %>
<%= f.fields_for "prices[#{index}]", price do |up| %>
<%= render "fields", :f => up %>
<% end %>
<% end %>
<%= f.submit "button" %>
<% end %>