1.md

using level-sublevel, level-sec and validimir to have

• validations
• schema documentation
• schema enforcement
• index definitions

of all your data in one file.

2.js

var level = require('level');
var sub = require('level-sublevel');
var avg = require('level-average');
var index = require('level-sec');
var v = require('validimir');
var emailRegExp = require('./email-regexp');

/**
 * Database.
 */

var db = sub(level(__dirname + '/../../db', {
  valueEncoding: 'json'
}));
module.exports = db;

/**
 * Ratings.
 */

db.ratings = avg(db.sublevel('ratings'));

validate(db.sublevel('ratings'), v.rules({
  key: v.string().match(/^[^!]+![^!]+$/),
  value: v.number().equal({ gte: 0, lte: 5 })
}));

/**
 * Blog posts.
 */

db.posts = index(db.sublevel('posts'))
  .by('Slug', ['slug'])
  .by('Creator', ['creator', 'createdAt'])
  .by('Published', ['published', 'createdAt'])
  .db;

validate(db.posts, v.rules({
  'key': v.string().match(/[0-9a-f]{32}/),
  'value': v.rules({
    'title': v.string().len({ gte: 3 }),
    'createdAt': v.number(),
    'creator': v.string(),
    'id': v.string().equal(v.value('../key')),
    'categories': v.optional().array().each(v.string().match(/[0-9a-f]{32}/))
  })
}));

/**
 * Published.
 */

db.published = index(db.sublevel('published'))
  .by('Slug', ['slug'])
  .db;

validate(db.published, v.rules({
  'key': v.string().equal(v.value('value.id')),
  'value': v.object().rules({
    'id': v.string().match(/[0-9a-f]{32}/),
    'title': v.string().len({ gte: 3 }),
    'creator': v.string(),
    'slug': v.string()
  })
}));

/**
 * Users.
 */

db.users = db.sublevel('users');

validate(db.users, v.rules({
  'key': v.string().equal(v.value('value.name')),
  'value': v.object().rules({
    'email': v.string().match(emailRegExp),
    'name': v.string()
  })
}));

/**
 * Sessions.
 */

db.sessions = db.sublevel('sessions');

validate(db.sessions, v.rules({
  'key': v.string(),
  'value': v.string().match(emailRegExp)
}));

/**
 * Emails.
 */

db.emails = db.sublevel('emails');

validate(db.emails, v.rules({
  'key': v.string().match(emailRegExp),
  'value': v.string()
}));

/**
 * Validation helper.
 */

function validate(db, fn) {
  db.pre(function(ch) {
    if (ch.type == 'put') fn(ch);
  });
  return db;
}

This was epically helpful. Thanks for sharing!

Great! Thanks for sharing