Childish

Childish is an opinionated LevelUP abstraction that stores and operate on keys in the form of parent/child.

Besides giving you a way to store and delete these keys, you can query for the existence of a key using .ok(key) get a list of all children of a given parent using .children(parent) or a list of all parents using .parents(child).

Notice that there are no values associated with the keys. This is just a database for storing parent-child relationships using a hierarchical key structure.

You can use any LevelDOWN compatible datastore you like as your backend. Here are a few popular once:

• LevelDOWN - Doh!
• MemDOWN - A drop-in replacement for LevelDOWN that works in memory only
• MongoDOWN - MongoDB backend for LevelUP
• SQLDown - sql backend for levelup
• mysqlDOWN - An drop-in replacement for LevelDOWN that works in mysql

Installation

npm install childish

Example

var levelup = require('level');
var db = require('childish')(levelup('/tmp/my-db'));
 
db.put('admin/odin', function (err) {
  db.put('moderator/odin', function (err) {
    db.put('moderator/thor', function (err) {
      db.ok('admin/odin', function (err, ok) {
        if (ok) console.log('Odin is an admin');
      });
 
      console.log('The follwoing users are admins:');
      db.children('admin').pipe(console.log);
 
      console.log('Odin have the following permissions:');
      db.parents('odin').pipe(console.log);
    });
  });
});

API

• db.put(key, callback) - Register a key (key format: parent/child)
• db.ok(key, callback) - Check if a key exists (key format: parent/child)
• db.del(key, callback) - Remove a key (key format: parent/child)
• db.children(parent) - Get a stream of all children for parent
• db.parents(child) - Get a stream of all parents for child

License

MIT