我刚刚从回形针导轨插件切换到回形针宝石。该项目是一个 rails 2.3 应用程序，我使用的是回形针 2.7.2 gem。
我收到以下奇怪的错误：
identify: unable to open image `file': No such file or directory @ error/blob.c/OpenBlob/2617.
identify: no decode delegate for this image format `file' @ error/constitute.c/ReadImage/544.
好像回形针正在寻找一个名为“文件”的文件，但我不知道为什么。我没有更改我们之前的任何代码。它曾经可以工作，我所做的只是升级到新版本并在插件上使用 gem。
有任何想法吗？
更新
这是回形针中的一个错误，它无法正确解析命令的内容。我深入研究了回形针的来源以找到：
def run(cmd, arguments = "", local_options = {})
if options[:image_magick_path]
Paperclip.log("[DEPRECATION] :image_magick_path is deprecated and will be removed. Use :command_path instead")
end
command_path = options[:command_path] || options[:image_magick_path]
Cocaine::CommandLine.path = [Cocaine::CommandLine.path, command_path].flatten.compact.uniq
local_options = local_options.merge(:logger => logger) if logging? && (options[:log_command] || local_options[:log_command])
Cocaine::CommandLine.new(cmd, arguments, local_options).run
end
和
# Uses ImageMagick to determing the dimensions of a file, passed in as either a
# File or path.
# NOTE: (race cond) Do not reassign the 'file' variable inside this method as it is likely to be
# a Tempfile object, which would be eligible for file deletion when no longer referenced.
def self.from_file file
file_path = file.respond_to?(:path) ? file.path : file
raise(Paperclip::NotIdentifiedByImageMagickError.new("Cannot find the geometry of a file with a blank name")) if file_path.blank?
geometry = begin
Paperclip.run("identify", "-format %wx%h :file", :file => "#{file_path}[0]")
rescue Cocaine::ExitStatusError
""
rescue Cocaine::CommandNotFoundError => e
raise Paperclip::CommandNotFoundError.new("Could not run the `identify` command. Please install ImageMagick.")
end
parse(geometry) ||
raise(NotIdentifiedByImageMagickError.new("#{file_path} is not recognized by the 'identify' command."))
end
Paperclip.run 命令由于某种原因无法替换 :file 占位符。我通过在命令行上运行以下命令来验证这一点：
identify :file
Monkey 手动修补替换会在发生类似情况时产生其他错误。