magnolia–A beautiful MongoDB driver w/ Q

Magnolia implements a coherent, lazy, & chainable interface... with promises! Don't nest callbacks anymore than you have to!

Init

If you don't mind state, you can init the module's state with default options.

var mongo = require('magnolia'),
    ObjectID = mongo.ObjectID;

mongo
    .server({host: 'localhost', port: 27117)
    .db('hello')
    .options({w: 1})
    .init(); // makes all the previous calls stored as defaults

Or you can start a chain with the defaults you would like.

var mongo = require('magnolia')
    .server({host: 'localhost', port: 27117)
    .db('hello')
    .options({w: 1});

Connection

• magnolia(collection, [db])
• .collection(collection)
• .db(db)
• .server(server)
• .options(...)
  • m:1
  • journal:true
  • fsync:true
  • slaveOk:true

Find

magnolia('user')
    .filter({_id: ObjectID('4e4e1638c85e808431000003')}) // filter!
    .one() // just find one!
    .then(function (user) { // evaluate as a promise
        console.log('hello', user.name);
    });

magnolia('user')
    .filter({hello: 'world'})
    .toArray(function (err, docs) { /* ... */ });

• .toArray([cb]) Query the collection, otherwise it will be lazily queried when you evaluate the chain as a promise
• .filter(criteria) Filter the collection
• .one() Find one! And return the document, instead of a list.
• .limit(n).skip(m) to control paging.
• .sort(fields) Order by the given fields. There are several equivalent syntaxes:
  • .sort([['field1', 'desc'], ['field2', 'asc']])
  • .sort([['field1', 'desc'], 'field2'])
  • .sort('field1') ascending by field1

Find and modifiy

magnolia('user')
    .filter(query)
    .sort(sort)
    .options(options)
    .findAndModify(objNew, [options], [callback]);

Useful options (including the previous options):

• .filter(...)
• .sort(...)
• .options(...)
  • remove:true set to a true to remove the object before returning
  • new:true set to true if you want to return the modified object rather than the original. Ignored for remove.
  • upsert:true Atomically inserts the document if no documents matched.

Remove

magnolia('user')
    .filter(query)
    .remove(extra_query)
    .then(function (remove_count) { /* ... */ });

Insert

magnolia('user')
    .insert({name: 'ryan', company: 'Submersible'}, {safe: true})
    .then(function (doc) { /* ... */ });

magnolia('user')
    .safe()
    .insert([{foo: 'bar'}, {hello: 'world'}], function (err, docs) {
        /* ... */
    });

• .safe() or .unsafe() Make sure document is in the database before returning
• .options(...)
  • safe:true

Update; update and insert (upsert)

Signature:

magnolia('user')
    .filter(criteria)
    .update(update, [options], [callback]);

magnolia('user')
    .filter(criteria)
    .upsert(objNew, [options], [callback]);

Useful options:

• .filter(...)
• .one() or .multi()
• .safe() or .unsafe()
• .options(...)
  • safe:true Should always set if you have a callback.
  • multi:true If set, all matching documents are updated, not just the first.
  • upsert:true Atomically inserts the document if no documents matched.

Save

Performs an update if there's an _id, and an insert if not!

magnolia('user').save({_id: ObjectID('50c03c9c766c8598e0000002'), foo: 'bar'}); // update
magnolia('user').save({hello: 'world'}); // insert

Count

magnolia('user').count([filter], [cb]);

Map/reduce

Data types

magnolia.Long(numberString)
magnolia.ObjectID(hexString)
magnolia.Timestamp()
magnolia.DBRef(collectionName, id, dbName)
magnolia.Binary(buffer)
magnolia.Code(code, [context])
magnolia.Symbol(string)
magnolia.MinKey()
magnolia.MaxKey()
magnolia.Double(number)

TODO

1. Think of things that are left todo

2. commands

3. insert DONE

4. remove DONE

5. update DONE

6. count DONE

7. upsert DONE

8. findAndModify DONE

9. toArray DONE

10. nextObject

11. each

12. ensureIndex?

13. wtf is aggregation?

14. mapreduce

15. db

16. collection

17. server

18. wrap the data types

19. can i test a bad connection?

20. features

21. nextObject

22. each

23. ensureIndex

24. map/reduce

25. queueing, max connections

26. raw mongodb connection

27. fix

28. find's limit & sort

29. does server work?

Check this

1. think of the options, and what can be made coherent
2. do it!
3. write test for that method
4. document