Ruby on rails 文件始终以PDF格式在rails中下载

我在rails应用程序中定义了一个上传程序。我在这里面临的问题是，当我下载上传的文件时，它是以PDF格式下载的，而不是文件的实际格式

class DocumentController < MyAccountController
  def show
   @agency = current_agency
   redirect_to @agency.document.url
  end
end

<script>
 downloadDocument() {
   var url = 'myagency/document',
   fileName = "EngagementLetter",
   file;
   this.$axios.get(url, { responseType: 'blob' })
   .then(response => {
    file = new Blob(
    [response.data],
    { type: 'application/pdf, image/gif, image/jpeg' }
   );
   FileSaver.saveAs(file, fileName);
   });
  }
</script>

方法下载该文件

class DocumentController < MyAccountController
  def show
   @agency = current_agency
   redirect_to @agency.document.url
  end
end

<script>
 downloadDocument() {
   var url = 'myagency/document',
   fileName = "EngagementLetter",
   file;
   this.$axios.get(url, { responseType: 'blob' })
   .then(response => {
    file = new Blob(
    [response.data],
    { type: 'application/pdf, image/gif, image/jpeg' }
   );
   FileSaver.saveAs(file, fileName);
   });
  }
</script>

下载文件（）{
变量url='myagency/document'，
fileName=“约定函”，
文件
这个.axios.get（url，{responseType:'blob'}）
。然后（响应=>{
file=newblob(
[答复.数据]，
{键入：'application/pdf、image/gif、image/jpeg'}
);
FileSaver.saveAs（文件，文件名）；
});
}

我也遇到过类似的问题，以下几点对我有效

      var url = 'myagency/document',
      fileName = "EngagementLetter",

      axios.get(url, { responseType: 'blob' })
      .then(response => {
        console.log(response.data)
        const url = window.URL.createObjectURL(response.data)

        const link = document.createElement('a')
        link.href = url
        link.setAttribute('download', fileName )
        document.body.appendChild(link)
        link.click()
        link.remove()
      });

您会注意到

response.data

是

Blob{size:#####，在控制台中键入：“image/jpeg”}

。您不必指定类型