Errors helper and field error proc

app/helpers/errors_helper.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module ErrorsHelper
+  # Rendering an error inside the field
+  #
+  # @param html_tag [ActiveSupport::SafeBuffer]
+  # @param instance [ActionView::Helpers::Tags::Base]
+  def field_error_helper(html_tag, instance)
+    return html_tag if instance.is_a?(ActionView::Helpers::Tags::Label) # Don't wrap labels
+
+    error_messages = instance.error_message
+    content_tag(:div, html_tag + content_tag(:div, error_messages.join('; '), class: 'error-text'),
+                class: 'field-with-errors')
+  end
+end