Question

我尝试在使用此代码向API发送请求之前压缩图像：

require 'sinatra'
require 'unirest'
require 'mini_magick'
require 'json'

require 'open-uri'

get '/' do

    File.read('public/views/index.erb')

end

post '/' do
    Unirest.timeout(5)
    image = MiniMagick::Image.open(params['user_image'][:tempfile])
    image.resize "600x400" 
    response = Unirest.post 'https://search.craftar.net/v1/search',
            parameters: {
                token: "703eb042371c49f0",
                image: image                                        
            }

    body = response.body

    url = body['results'][0]['item']['url']

  redirect url

end

当它运行以获得结果时，我收到以下错误：

ArgumentError at /
wrong number of arguments (1 for 0)

/usr/local/Cellar/ruby/2.2.3/lib/ruby/2.2.0/tempfile.rb in open
  def open
/usr/local/Cellar/ruby/2.2.3/lib/ruby/2.2.0/open-uri.rb in open
      name.open(*rest, &block)
/usr/local/lib/ruby/gems/2.2.0/gems/mini_magick-4.3.6/lib/mini_magick/image.rb in open
      Kernel.open(path_or_url, "rb") do |file|
server.rb in block in <main>
    image = MiniMagick::Image.open(params['user_image'][:tempfile])
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in call
          proc { |a,p| unbound_method.bind(a).call }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in block in compile!
          proc { |a,p| unbound_method.bind(a).call }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in []
            route_eval { block[*args] }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in block (3 levels) in route!
            route_eval { block[*args] }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in route_eval
      throw :halt, yield
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in block (2 levels) in route!
            route_eval { block[*args] }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in block in process_route
        block ? block[self, values] : yield(self, values)
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in catch
      catch(:pass) do
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in process_route
      catch(:pass) do
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in block in route!
          returned_pass_block = process_route(pattern, keys, conditions) do |*args|
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in each
        routes.each do |pattern, keys, conditions, block|
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in route!
        routes.each do |pattern, keys, conditions, block|
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in block in dispatch!
        route!
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in block in invoke
      res = catch(:halt) { yield }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in catch
      res = catch(:halt) { yield }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in invoke
      res = catch(:halt) { yield }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in dispatch!
      invoke do
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in block in call!
      invoke { dispatch! }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in block in invoke
      res = catch(:halt) { yield }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in catch
      res = catch(:halt) { yield }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in invoke
      res = catch(:halt) { yield }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in call!
      invoke { dispatch! }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in call
      dup.call!(env)
/usr/local/lib/ruby/gems/2.2.0/gems/rack-protection-1.5.3/lib/rack/protection/xss_header.rb in call
        status, headers, body = @app.call(env)
/usr/local/lib/ruby/gems/2.2.0/gems/rack-protection-1.5.3/lib/rack/protection/path_traversal.rb in call
        app.call env
/usr/local/lib/ruby/gems/2.2.0/gems/rack-protection-1.5.3/lib/rack/protection/json_csrf.rb in call
        status, headers, body = app.call(env)
/usr/local/lib/ruby/gems/2.2.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb in call
        result or app.call(env)
/usr/local/lib/ruby/gems/2.2.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb in call
        result or app.call(env)
/usr/local/lib/ruby/gems/2.2.0/gems/rack-protection-1.5.3/lib/rack/protection/frame_options.rb in call
        status, headers, body        = @app.call(env)
/usr/local/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/logger.rb in call
      @app.call(env)
/usr/local/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/commonlogger.rb in call
      status, header, body = @app.call(env)
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in call
        call_without_check(env)
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in call
      env['sinatra.commonlogger'] ? @app.call(env) : super
/usr/local/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/head.rb in call
    status, headers, body = @app.call(env)
/usr/local/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/methodoverride.rb in call
      @app.call(env)
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/show_exceptions.rb in call
      @app.call(env)
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in call
      result, callback = app.call(env), env['async.callback']
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in call
      @stack.call(env)
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in block in call
        synchronize { prototype.call(env) }
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in synchronize
          yield
/usr/local/lib/ruby/gems/2.2.0/gems/sinatra-1.4.6/lib/sinatra/base.rb in call
        synchronize { prototype.call(env) }
/usr/local/lib/ruby/gems/2.2.0/gems/rack-1.6.4/lib/rack/handler/webrick.rb in service
        status, headers, body = @app.call(env)
/usr/local/Cellar/ruby/2.2.3/lib/ruby/2.2.0/webrick/httpserver.rb in service
      si.service(req, res)
/usr/local/Cellar/ruby/2.2.3/lib/ruby/2.2.0/webrick/httpserver.rb in run
          server.service(req, res)
/usr/local/Cellar/ruby/2.2.3/lib/ruby/2.2.0/webrick/server.rb in block in start_thread
          block ? block.call(sock) : run(sock)

如果这不起作用，我如何提取临时存储的用户上传的图像，并将其压缩到API所需的特定要求。

非常感谢任何帮助！

Answer 1

image.rb中的代码在tempfile上调用Kernel.open。这从open-uri.rb调用open，如果对象响应，则调用open。临时文件响应open，但不接受来自image.rb的'rb'param open-uri委托。

我认为最简单的解决方案是将临时文件包装到普通文件中并从那里开始：

image = MiniMagick::Image.open(File.new(params[:user_image][:tempfile]))

代码仍然失败，但我认为MiniMagick中的错误（unrecognized option -to-ary'）是无关的。

Sinatra：在发送到API之前，通过MiniMagick压缩来自tempfile的图像

1 个答案: