add filesCollection

src/server/service/file-uploader/gridfs.js

@@ -7,6 +7,7 @@ module.exports = function(crowi) {
   const lib = new Uploader(crowi);
   const COLLECTION_NAME = 'attachmentFiles';
   const CHUNK_COLLECTION_NAME = `${COLLECTION_NAME}.chunks`;
+  const FILES_COLLECTION_NAME = `${COLLECTION_NAME}.files`;
 
   // instantiate mongoose-gridfs
   const { createModel } = require('mongoose-gridfs');
@@ -17,6 +18,7 @@ module.exports = function(crowi) {
   });
   // get Collection instance of chunk
   const chunkCollection = mongoose.connection.collection(CHUNK_COLLECTION_NAME);
+  const filesCollection = mongoose.connection.collection(FILES_COLLECTION_NAME);
 
   // create promisified method
   AttachmentFile.promisifiedWrite = util.promisify(AttachmentFile.write).bind(AttachmentFile);