ruby-on-rails – 来自url的Rails CarrierWave存储图像无法将nil

发布时间：2020-12-17 03:46:30 所属栏目：百科来源：网络整理

导读：使用CarrierWave和Amazon S3,我能够存储来自本地文件的图像,但是当我尝试从某个URL存储它们时,我得到’TypeError：无法将nil转换为String’ from /Users/bashar/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/carrierwave-0.5.8/lib/carrierwave/up

使用CarrierWave和Amazon S3,我能够存储来自本地文件的图像,但是当我尝试从某个URL存储它们时,我得到’TypeError：无法将nil转换为String’

from /Users/bashar/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/carrierwave-0.5.8/lib/carrierwave/uploader/cache.rb:149:in `join'
    from /Users/bashar/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/carrierwave-0.5.8/lib/carrierwave/uploader/cache.rb:149:in `cache_path'
    from /Users/bashar/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/carrierwave-0.5.8/lib/carrierwave/uploader/cache.rb:121:in `block in cache!'
    from /Users/bashar/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/carrierwave-0.5.8/lib/carrierwave/uploader/callbacks.rb:17:in `with_callbacks'
    from /Users/bashar/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/carrierwave-0.5.8/lib/carrierwave/uploader/cache.rb:112:in `cache!'
    from /Users/bashar/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/carrierwave-0.5.8/lib/carrierwave/uploader/store.rb:56:in `store!'
    from (irb):5
    from /Users/bashar/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/commands/console.rb:45:in `start'
    from /Users/bashar/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/commands/console.rb:8:in `start'
    from /Users/bashar/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/commands.rb:40:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

这是我正在尝试的代码

require 'open-uri'
image = "open(image_url)
@object.image.store!(file)

显然@object拥有Uploader图像,它使用本地文件系统工作正常.我试着添加一个

def root
????Rails.root.join’public /’
??结束

我的上传者也没有运气.

任何的想法？

解决方法

要告诉载波下载远程URL,请使用以下语法：

@object.remote_image_url = "http://www.example.com/file.png"
@object.save

（编辑：李大同）

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