var level = require('level');
var db = level('/tmp/db', { valueEncoding: 'json' });
var Model = require('level-orm');
function Users(db) {
  // users is the sublevel name to user
  // handle is the primary key to user for insertion
  Models.call(this, { db: db }, 'users', 'handle');
}
util.inherits(Users, Models);

var users = new Users(db);

// save to database
users.save({ handle: 'eugeneware', name: 'Eugene', email: '[email protected]' },
  function (err, id) {
    // id will be the primary key
  });

// retrieve from database
users.get('eugeneware', function (err, user) { });

// delete from database
users.del('eugeneware');

// stream from database
users.createReadStream({start: 'a', end: 'c'}).pipe(...);

var level = require('level');
var bytewise = require('bytewise/hex');
var db = level('/tmp/db', { keyEncoding: bytewise, valueEncoding: 'json' });
var Model = require('level-orm');

function Feed(db) {
  // compound key of 'user' and 'id'
  Models.call(this, { db: db }, 'feed', ['user', 'id']);
}
util.inherits(Feed, Models);

var feed = new Feed(db);
feed.save({ user: 'eugeneware', id: 123, message: 'Test' }, cb);

var level = require('level');
var bytewise = require('bytewise/hex');
// we're just going to use a unique timestamp for our keys
var timestamp = require('monotonic-timestamp');
var db = level('/tmp/db', { keyEncoding: bytewise, valueEncoding: 'json' });
function Messages(db) {
  Models.call(this, { db: db }, 'messages', 'id');
}
util.inherits(Messages, Models);
// set the function to generate ids
Messages.prototype.keyfn = timestamp;

var messages = new Messages(db);
messages.save({ message: 'My message' }, function (err, id) {
  // id will contain the auto-generated ID
});

var level = require('level');
var bytewise = require('bytewise/hex');
var timestamp = require('monotonic-timestamp');

// Container class
function LevelMicroBlog(dbPath) {
  this.db = sublevel(level(dbPath, { keyEncoding: bytewise, valueEncoding: 'json' }));
  this.Users = new Users(this);
  this.Messages = new Messages(this);
}

LevelMicroBlog.prototype.close = function(cb) {
  if (this.db) return this.db.close(cb);
  this.db = null;
  cb(null);
}

// Users sublevel model
function Users(container) {
  Models.call(this, container, 'users', 'handle');
}
util.inherits(Users, Models);

// Messages sublevel model
function Messages(container) {
  Models.call(this, container, 'messages', 'id');
}
util.inherits(Messages, Models);
Messages.prototype.keyfn = timestamp;

// instantiate a new container class
var mblog = new LevelMicroBlog('/tmp/db');
mblog.Users.save({ 'handle': 'EugeneWare', name: 'Eugene Ware'}, ...);
mblog.Messages.save({ message: 'A new message' }, ...);

var Model = require('level-orm/bytewise');
// extend as usual