=simple_form_for(@product) do |f|
  =f.input :name,         placeholder: 'Write name product', label: false
  =f.input :description,  placeholder: 'Describe the product', label: false, as: :text
  =f.input :category,     collection: @category, prompt: 'Select category product', label: false
  =f.input :price
  =f.input :quantity
  #simple_fields_for
    Fields_form
    =f.simple_fields_for :images do |img|
      =f.input :image, as: :file
      =link_to_remove_association "Delete Image", f
      .links
      =link_to_add_association 'add task', f, :images
  =f.button :submit