我是新的Rails,我做了一個嵌套屬性的模型,完美地工作。但是在顯示所有嵌套屬性的時候,我得到一個錯誤。Rails 4 - 如何顯示所有嵌套的屬性?
模型
class Slide < ActiveRecord::Base
belongs_to :user
has_many :images, :dependent => :destroy
accepts_nested_attributes_for :images, :reject_if => lambda { |a| a[:img_str].blank? }
end
class Image < ActiveRecord::Base
belongs_to :slide
validates :img_str, presence: true
mount_uploader :img_str, AssetUploader
end
slides_controller
def index
@slide = Slide.all
end
滑動/視圖/索引
<% @slide.each do |slide| %>
<%= slide.images.img_str %>
<% end %>
滑軌顯示此:
undefined method `img_str' for #Image::ActiveRecord_Associations_CollectionProxy:0x00000003e98dd0
我如何才能使與圖像模型的關聯?
你可能想急於載入圖像在'index'方法幻燈片避免N + 1個查詢:'@slide =幻燈片.includes(:圖像).all'。 – Surya 2014-10-28 20:01:47