ruby-on-rails - 如何将 ActiveRecord 结果数组转换为普通数组？

Question

如何将 @recipe.components.find ( [# , # ingredient_id: 2>] ) 的结果集转换为数组，例如 [1,2]

<% @ingredients.each do |ingredient| %>
  <div class="field">
  <%= check_box_tag 'ingredients[]', ingredient.id, @recipe.components.find(:all, :select => "ingredient_id").include?(ingredient.id) %><%= ingredient.name %>
  </div>
<% end %>

谢谢!

Answer 1

你可以使用

@result.map {|i| i.ingredient_id }