Add namespace for form_tag in Rails

Question

I'm using bootstrap_form gem for form generating in Rails. In my form view, I am using form_tag instead of form_for

  <%= bootstrap_form_tag url: 'metafields' do |f| %>
    <%= f.hidden_field :owner_id, value: params[:owner_id] %>
    <%= f.text_field :namespace, placeholder: 'Namespace of metafield' %>
    <%= f.text_field :key, placeholder: 'Key of metafield' %>
    <%= f.text_area :description, placeholder: 'Description about metafield' %>
    <%= f.select :type, [['String', 'string']], class: 'selectpicker' %>
  <% end %>

Is there a way to submit this form with params including prefix namespace like params[:metafield][:owner_id].

When I tried with

<%= bootstrap_form_tag url: 'metafields', namespace: 'metafield' do |f| %>

It generates below input, which is not what I want

<input placeholder="Key of metafield" name="key" id="metafield_key" class="form-control" type="text" kl_vkbd_parsed="true">

Answer 1

quyetdc's answer is a way to go unless you have dynamic forms, here is a cleaner way

  <%= bootstrap_form_tag url: 'metafields' do |f| %>
    <%= f.fields_for :metafield do |mf| %>
      <%= mf.hidden_field :owner_id, value: params[:owner_id] %>
      <%= mf.text_field :namespace, placeholder: 'Namespace of metafield' %>
      <%= mf.text_field :key, placeholder: 'Key of metafield' %>
      <%= mf.text_area :description, placeholder: 'Description about metafield' %>
      <%= mf.select :type, [['String', 'string']], class: 'selectpicker' %>
  <% end %>