所有环境都是从railsinstaller设置的。 Ruby - 1.9.2-p290 Rails - 3.1.1等
错误： G：\ Projects \ burk＆gt; gem install paperclip -v'2.5.0' 错误：执行gem时...（Errno :: EINVAL） 参数无效 - C：/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/paperclip-2.5.0/test/fixtures/question?mark.png
版本2.4.5安装正常，但在迁移时遇到错误：
G：\ Projects \ burk＆gt; gem install paperclip -v'2.5.0' - trace 错误：执行gem时...（OptionParser :: InvalidOption） 无效选项： - trace
G：\ Projects \ burk＆gt; rake db：migrate --trace **调用db：migrate（first_time） **调用环境（first_time） **执行环境 **调用db：load_config（first_time） **调用rails_env（first_time） **执行rails_env **执行db：load_config **执行db：migrate == CreateBrands：迁移============================================= ====== - create_table（：品牌） 耙子流产了！ 发生错误，所有后续迁移都已取消：
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G:/Projects/burk/db/migrate/20120115082718_create_brands.rb:6:in阻止
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C：/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/activerecord-3.1.3/lib/acti
ve_record / connection_adapters / abstract / schema_statements.rb：161：in create_table
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C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/activerecord-3.1.3/lib/acti
ve_record/connection_adapters/mysql2_adapter.rb:481:in create_table'
C：/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/activerecord-3.1.3/lib/acti
ve_record / migration.rb：447：在say_with_time中的block in method_missing'
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ve_record/migration.rb:422:in块中
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ve_record / migration.rb：391：在block in migrate'
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任务：TOP =＆gt;分贝：迁移
答案 0 :(得分：6)
问题是有人在Gem测试文件中添加了一个名为question?mark.png的文件，以测试Paperclip使用此类文件名的行为。不幸的是，问号不是Windows中文件名的合法字符。 （请参阅directory，提交history和discussion以及issue）
最好的解决方法是下载zip file from Github，将其复制到项目中并从Gemfile中明确引用Gem，如下所示：
gem 'paperclip', path: 'vendor/gems/paperclip'
编辑：作为版本2.5.2，可以在Windows平台上再次安装Paperclip gem。 （Commit）