Saving

A lawnchair instance saves documents using the save method:

new Lawnchair(function() {
    this.save({me:'brian'})
})

A callback is, as always, your option:

var ppl = Lawnchair(function() {

    // traditional callback code
    this.save({key:'config', options:[1,2,3]}, function(obj){
        console.log(obj)
    })

    // terse callback style
    this.save({person:'joni'}, 'console.log(record)')
})

If you pass an object with a key then that record is updated (if it is in the store already).