Question

我的守则如下:

模型:

class Article < ActiveRecord::Base
  attr_accessible :title, :author, :content, :imageable_attributes

  has_one :image, as: :imageable, dependent: :destroy
  accepts_nested_attributes_for :image, allow_destroy: true

  validates_presence_of :title, :content, :author
end

class Image < ActiveRecord::Base
  mount_uploader :image, ImageUploader
  attr_accessible :image, :caption, :imageable_id, :imageable_type, :article_ref

  validates_presence_of :image
  belongs_to :imageable, :polymorphic => true
end

这里,我曾尝试过:

article = Article.create!(title: "test", content: "test", author: "test", image_attributes: {image: "test.jpg", caption: "test caption"})

该条没有错误,但如果我说:

article.image

我收到了:

=> nil

如果是青少年中的一类:

article = Article.new(title: "test", content: "test", author: "test")
article.build_image(image: "test.jpg")

我收到了:

=> Validation failed: Image image can t be blank

得到极大赞赏的任何帮助,我非常混淆!

Answer 1

我认为,必须提供附件本身,而不仅仅是一条道路。例如,

i = Image.new(
  :image => File.join(Rails.root, "test.jpg")
)
i.image

# =>

......

i = Image.new(
  :image => File.open(File.join(Rails.root, "test.jpg"))
)
i.image

# => /uploads/tmp/20120427-2155-1316-5181/test.jpg

无需使用<代码>File. open<>/code>,但使用多部分POST加以节省。

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