Question

我的上传器文件

for

我正在上传# creates a `list` and binds it to name "a" a = [1, 2, 3] # get the object bound to name "a" and binds it to name "b" too. # at this point "a" and "b" both refer to the same `list` instance b = a print id(a), id(b) print a is b # so if we mutate "a" - actually "mutate the object bound to name 'a'" - # we can see the effect using any name refering to this object: a.append(42) print b # now we rebind "a" - make it refer to another object a = ["a", "b", "c"] # at this point, "b" still refer to the first list, and # "a" refers to the new ["a", "b", "c"] list print id(a), id(b) print a is b # and of course if we now mutate "a", it won't reflect on "b" a.pop() print a print b图片，当我尝试从上传文件中读取元数据时，一切都将丢失。有没有办法在上传时保留它？

Answer 1

随意搜索会返回宝石Carrierwave-meta。基本上，添加到您的gemfile：

./adb install -r <path-to-apk>

然后运行gem 'carrierwave-meta'。然后将bundle install选项添加到您的上传器中：

store_meta

当然，您需要确保您的模型可以存储值：

class TestUploader < CarrierWave::Uploader::Base

  include CarrierWave::RMagick
  include CarrierWave::Meta

  process :store_meta => [{md5sum: true}]
  version :version do
    process :resize_to_fill => [200, 200]
    process :store_meta
  end
end

file = File.open('test.jpg') # JPEG 500x300, 20000 bytes
uploader = TestUploader.new
uploader.store!(file)

uploader.width        # 500
uploader.height       # 300
uploader.image_size   # [500, 300]

Carrierwave在上传时丢弃元数据

1 个答案: