Meteor-files: Exception in delivering result of invoking '_FilesCollectionWrite_assets': TypeError: Cannot read property 'link' of undefined

Created on 14 Oct 2017 · 3Comments · Source: veliovgroup/Meteor-Files

I'm trying to get a file from the collection and generate a download link for it, but I keep getting the error above. File uploaded successfully but can't retrieve it. Here is my code:

if (file) {
            var uploadInstance = Assets.insert({
                file: file,
                streams: 'dynamic',
                chunkSize: 'dynamic'
            }, false);

            uploadInstance.on('start', function() {
                template.currentUpload.set(this);
            });

            uploadInstance.on('end', function(err, fileObj) {
                if (err) {
                    FlashMessages.sendError(err.reason);
                } else {
                    FlashMessages.sendSuccess('File "' + fileObj.name + '" successfully uploaded');
                    console.log(fileObj._id); // returns an Id
                    var fileRef = Assets.findOne({_id: fileObj._id});
                    console.log(fileRef); // returns undefined
                    var link = fileRef.link();
                    console.log(link);
                }
                template.currentUpload.set(false);
            });

            uploadInstance.start();
        }

I don't know why it's returning undefined, but if I use Assets.find({_id: fileObj._id}) it returns a FilesCursor which I wasn't able to work with, throws an error that one must pass a plain object when I try to generate a link.

question

Source

tobitech

Most helpful comment

I read the docs. And I already had Publications and Subscriptions setup for FilesCollection, .find() works but .findOne() didn't. I just didn't know why it was returning undefined. Anyway the .link() code you posted worked for me. Thank you.

tobitech on 14 Oct 2017

👍2 🎉1

All 3 comments

@tobitech ,

Before you can query FilesCollection you have to publish, and subscribe on its data. As with any other Meteor's collection. That's why you're getting undefined
__Please read the docs before asking the question here__, as it has the answer on your question. Taking a look on the .link() method you may find out what it will work in the next way:

            uploadInstance.on('end', function(err, fileObj) {
                if (err) {
                    FlashMessages.sendError(err.reason);
                } else {
                    FlashMessages.sendSuccess('File "' + fileObj.name + '" successfully uploaded');
                    console.log(fileObj._id); // returns an Id
                    var link = Assets.link(fileObj);
                    console.log(link);
                }
                template.currentUpload.set(false);
            });