Form Builder prefix

I have a form like this one:

<%= form_for People::Selector::GenderReportForm.new, url: selector_download_path do |f| %>

   <%= f.text_field :name %>

   <%= select_month(Date.today, 
       {field_name: 'start_month', 
        prefix: "people_selector_gender_report_form"},
       {class: "form-control"}) %>

<% end %>

From my point of view the prefix: "people_selector_gender_report_form" should be also be able to get from the resource: People::Selector::GenderReportForm.new

Is there a way to build the same form without the prefix? Or is for example something like prefix: f.prefix possible? Thanks