A way to extend default FormBuilder when using `form_with`

custom_form_builder.rb

# custom_form_builder.rb
class CustomFormBuilder < ActionView::Helpers::FormBuilder
  
  def error_tag(field, opts = {})
    @template.content_tag(:span, @object.errors[field].join(", "), class: "text-danger") if [email protected][field].blank?
  end
end

# _form.html.erb
<%= form_with(model: <model>, local: true, builder: CustomFormBuilder) do |form| %>

  <div class="field">
    <%= form.label :name %>
    <%= form.text_field :name %>
    <%= form.error_tag :name %>
  </div>
  
...
    
# or you can set it as default in config/application.rb
config.action_view.default_form_builder = "CustomFormBuilder"