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copied!<p>Actually your question has many implications on many levels. Basically on MongoDB level one may save binary data in fields of binary type of ordinary documents. I believe it is working now in mongo_dart. In objectory_console (server side version of objectory which communicate with mongodb directly via mongo_dart) I think it would work too. Your model object would be like</p> <pre class="lang-dart prettyprint-override"><code>class UploadedFile extends PersistentObject { String get fileName => getProperty('fileName'); set fileName(String value) => setProperty('fileName',value); BsonBinary get content => getProperty('content'); set content(BsonBinary value) => setProperty('content',value); .... .... } </code></pre> <p>BsonBinary has named constructor <code>BsonBinary.from(List from)</code> which efficient but works only with dart:io (on server side) For browser based objectory currently you may use named constructor <code>BsonBinary.fromHexString()</code>. I'm afraid this woud have significant incurred overhead. </p> <p>Another consideration is limit on total document size in MongoDB, which is 16mb. So your files must be less then that size.</p> <p>Files of bigger size one store in MongoDB through GridFS layer, GridFS support was added to mongo_dart recently.</p> <p>Usage example from <a href="https://github.com/vadimtsushko/mongo_dart/blob/master/test/gridfs_tests.dart" rel="nofollow">https://github.com/vadimtsushko/mongo_dart/blob/master/test/gridfs_tests.dart</a> :</p> <pre class="lang-dart prettyprint-override"><code>Future testFileToGridFSToFile() { GridFS.DEFAULT_CHUNKSIZE = 30; GridIn input; String dir = path.dirname(path.fromUri(Platform.script)); var inputStream = new File('$dir/gridfs_testdata_in.txt').openRead(); Db db = new Db('${DefaultUri}mongo_dart-test'); return db.open().then((c){ var gridFS = new GridFS(db); clearFSCollections(gridFS); input = gridFS.createFile(inputStream, "test"); return input.save(); }).then((c) { var gridFS = new GridFS(db); return gridFS.getFile('test'); }).then((GridOut gridOut) { return gridOut.writeToFilename('$dir/gridfs_testdata_out.txt'); }).then((c){ List<int> dataIn = new File('$dir/gridfs_testdata_in.txt').readAsBytesSync(); List<int> dataOut = new File('$dir/gridfs_testdata_out.txt').readAsBytesSync(); expect(dataOut, orderedEquals(dataIn)); db.close(); }); } </code></pre>

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