= f_form_for @product, html: { multipart: true } do |f|
  = f.error_messages
  = f.text_field :name
  = f.price_field :price
  = f.collection_select :category, Product.categories.keys
  = f.number_field :stock
  = f.number_field :calories
  = f.file_field :avatar
  = f.fields_for :barcodes do |ff|
    = ff.number_field :code, readonly: true
  = f.submit