I'm brand-spanking-new to Meteor and I would like to integrate it with my existing system that is powered by a MongoDB. I see that meteor has an accounts-facebook and accounts-twitter package to help me with authenticating on these services which is what my existing system does.
The problem is that I already have a format for my users collection. I don't mind adding additional fields for the data I don't have but I rather have meteor use the fields I already have defined. Ie: username and email.
So,
a) How do I use meteor to connect to an existing db while in development?
b) How do I tell meteor which fields to use for username and email?