Multiple remote databases, single local database (fancy replication)

Question

I have a PouchDB app that manages users.

Users have a local PouchDB instance that replicates with a single CouchDB database. Pretty simple.

This is where thi

Answer 1

Replicate from many remote databases to your local one:

remoteDB1.replicate.to(localDB);
remoteDB2.replicate.to(localDB);
remoteDB3.replicate.to(localDB);
// etc.

Then do a filtered replication from your local database to the remote database that is supposed to receive changes:

localDB.replicate.to(remoteDB1, {
  filter: function (doc) {
    return doc.shouldBeReplicated;
  }
});

Why filtered replication? Because your local database contains documents from many sources, and you don't want to replicate everything back to the one remote database.

Why a filter function? Since you are replicating from the local database, there's no performance gain from using design docs, views, etc. Just pass in a filter function; it's simpler. :)

Hope that helps!

Edit: okay, it sounds like the names of the groups that the user belongs to are actually included in the first database, which is what you mean by "iterate over." No, you probably shouldn't do this. :) You are trying to circumvent CouchDB's built-in authentication/privilege system.

Instead you should use CouchDB's built-in roles, apply those roles to the user, and then use a "database per role" scheme to ensure users only have access to their proper group DBs. Users can always query the _users API to see what roles they belong to. Simple!

For more details, read the pouchdb-authentication README.