gistfile1.txt

var bobId = Meteor.users.insert({
        profile: {name: 'Bob Jones'}
    });

var bob = Meteor.users.findOne({_id: bobId});

for (var i = 0; i < 45; i++) { Posts.insert({
        title: 'Test post #' + i,
        author: bob.profile.name,
        userId: bob._id,
        url: 'http://google.com/?q=test-' + i, submitted: now - i * 3600 * 1000, commentsCount: 0
  }); 
}

//all of the documents created in this file have _id as string type when accessed in mongo shell.