I'm trying to evaluate using IndexedDB to solve the offline issue. It would be populated with data currently stored in a MongoDB database (as is).
Once data is stored in IndexedDB, it may be changed on the MongoDB server and I need to propagate those changes. Is there any existing framework or Library to do somehting like this for Mongo. I already know about CouchDB/PouchDB and am not exploring those two.
I haven't worked with IndexDB, but the design problem isn't that uncommon. My understanding of your app is that when the client makes the connection to MongoDB, you pull a set of documents down for local storage and disconnect. The client then can do things locally (not connected to the data server), and then push up the changes.
The way I see it you've got to handle two general cases:
- when the MongoDB server is updated and breaks continuity with the client, the client will have to
- poll for the data (timer?) or
- keep a websocket open to let notifications free-flow over the pipe
- when the user needs to push changed data back up the pipe
- you can reconnect asynchronously, check for state changes, (resolving conflicts according to your business rules)
- have a server side (light) interface for handling conflicts (depending on complexity of your app, comparing time stamps of state changes in MongoDB to IndexedDB updates should suffice)
