回形针validation不适用于Rails 4应用程序的Excel文件

所以我允许使用Paperclip上传许多types的文件（pdf，doc，docx，ppt，pptx，xls，xlsx和zip）。

到目前为止，一切正常。 除了一件事。 我注意到没有上传的* .xls文件。

这里是我的模型Document

 class Document < ActiveRecord::Base has_attached_file :file validates_attachment_content_type :file, content_type: [ "application/pdf", "application/vnd.ms-excel", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "application/msword", "application/vnd.openxmlformats-officedocument.wordprocessingml.document", "application/vnd.ms-powerpoint", "application/vnd.openxmlformats-officedocument.presentationml.presentation", "application/zip"] end 

我正在使用S3，这个问题发生在本地和生产（heroku）。 我听说它可能被链接到浏览器本身; 然而，我没有成功testing（在os x下）Chrome，Safari，Firefox和Opera。

这里的日志，当我尝试上传一个xls文件名称this-is-a-test-file.xls文件this-is-a-test-file.xls ：

Started POST "/documents" for ::1 at 2016-08-26 01:41:54 +0200 Processing by DocumentsController#create as HTML Parameters: {"utf8"=>"✓", "authenticity_token"=>"GdnkT1Iw8ajORrrSidpQ4Un4qlcN7qzZFk00j3fTTe0VpDO4ZhGQQG0ckO5DmrDzDdqzLw5SXI+O3p72zuP6qQ==", "document"=>{"file"=>#<ActionDispatch::Http::UploadedFile:0x007fdcc5479b78 @tempfile=#<Tempfile:/var/folders/gc/r_620xsx5hs44l70ftvwxpjr0000gn/T/RackMultipart20160826-79534-4kin0o.xls>, @original_filename="this-is-a-test-file.xls", @content_type="application/octet-stream", @headers="Content-Disposition: form-data; name=\"document[file]\"; filename=\"this-is-a-test-file.xls\"\r\nContent-Type: application/octet-stream\r\n">}, "commit"=>"upload file"} User Load (0.5ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT 1 [["id", 1]] Command :: file -b --mime '/var/folders/gc/r_620xsx5hs44l70ftvwxpjr0000gn/T/99ca719bb8fc2d3a1543726223f4d54520160826-79534-10bpmb.xls' (0.2ms) BEGIN Command :: file -b --mime '/var/folders/gc/r_620xsx5hs44l70ftvwxpjr0000gn/T/99ca719bb8fc2d3a1543726223f4d54520160826-79534-176ftj5.xls' (0.2ms) ROLLBACK Redirected to http://localhost:3000/documents Completed 302 Found in 82ms (ActiveRecord: 0.8ms)

任何想法 ？ 🙂