class Attribute < ApplicationRecord
  validates :name, presence: true
  validates :name, uniqueness: true

  has_many :attribute_vals
end
	
<div id="attributes_list">
  <%= @attributes.each do |attr| %>
    <% attr.attribute_vals.each do |val| %>
      - <%= val.name %>
    <% end %>
  <% end %>
</div>