ruby-on-rails - 未捕获的类型错误：无法读取 null 的属性“1”？

Question

我收到一个错误：Uncaught TypeError: Cannot read property '1' of null。这是什么意思？错误的来源是以下行id: file.meta['key'].match(/^cache\/(.+)/)[1]：

uppy.on('upload-success', (file, response) => {
 // construct uploaded file data in the format that Shrine expects
 const uploadedFileData = {
  id: file.meta['key'].match(/^cache\/(.+)/)[1], // object key without prefix
  storage: 'cache',
  metadata: {
   size: file.size,
   filename: file.name,
   mime_type: file.type,
  }
 }

 // set hidden field value to the uploaded file data so that it's submitted
 // with the form as the attachment
 hiddenInput.value = JSON.stringify(uploadedFileData)
})

我认为这是试图在不存在的索引处选择一些东西，但是……什么索引确实存在？

Answer 1

问题是这id: file.meta['key'].match(/^cache\/(.+)/)[1]与Shrine.storage. 我的前缀是uploads/cache. 我只需要将其改回cache.