ruby-on-rails – ActionDispatch :: Http :: UploadedFile.cont

describe Book do
  let(:book) {FactoryGirl.build(:book)}
  describe "Save" do
    context "with valid data" do
      before do
        cover_image = File.new(Rails.root + 'spec/fixtures/images/cover_valid.jpg')
        book.cover_file = ActionDispatch::Http::UploadedFile.new(tempfile: cover_image,filename: File.basename(cover_image),content_type: "image/jpeg")
        puts book.cover_file.content_type.nil?
        book.cover_file.content_type = "image/jpeg"
        puts book.cover_file.content_type
      end
      specify{expect(book.save).to be_true}
    end
  end
end

true
image/jpeg

我查看了有关UploadFile类的Rails源文件,我发现了这个问题.对于@content_type属性,例如,当getter和setter被命名为expected(.content_type)时,initialize方法在options hash中查找一个名为type的属性.同样的事情发生在@original_filename;初始化查找文件名而不是original_filename.这似乎是Rails 3代码库以来的情况.

所以,如果我将我的代码更改为以下内容,一切都按预期方式工作：

book.cover_file = ActionDispatch :: Http :: UploadedFile.new(tempfile：cover_image,filename：File.basename(cover_image),键入：“image / jpeg”)

rails / actionpack / lib / action_dispatch / http / upload.rb的相关章节

class UploadedFile
  # The basename of the file in the client.
  attr_accessor :original_filename

  # A string with the MIME type of the file.
  attr_accessor :content_type

  # A +Tempfile+ object with the actual uploaded file. Note that some of
  # its interface is available directly.
  attr_accessor :tempfile
  alias :to_io :tempfile

  # A string with the headers of the multipart request.
  attr_accessor :headers

  def initialize(hash) # :nodoc:
    @tempfile          = hash[:tempfile]
    raise(ArgumentError,':tempfile is required') unless @tempfile

    @original_filename = encode_filename(hash[:filename])
    @content_type      = hash[:type]
    @headers           = hash[:head]
  end