MongoDB Support

[nonfungibletunji]

How can I contribute?

[joshuawright11]

Hey @stunjiturner! Thanks for reaching out & volunteering to contribute!

As we launch we're only providing first class support for Postgres & MySQL, so if you were interested you could create MongoDB database plugin as a separate package.

It shouldn't be too complicated; there is a generic Database type and you can see how Postgres and MySQL implement it. Adding mongo support for Rune and the QueryBuilder would consist of...

1. Add a MongoDatabase that conforms to Database. Back it with mongo-swift-driver. See Postgres+Database for example.
2. Conform whatever row types the mongo swift driver sends back from queries to DatabaseRow. See Postgres+DatabaseRow for examples.
3. Override Grammar functions to compile the various statements that come in from Rune and the QueryBuilder. See Postgres+Grammar for examples. Note that you'll have to override just about every function, since mongo query syntax is completely different than the base SQL syntax.

That being said, since QueryBuilder and Rune are heavily skewed towards SQL syntax (joins, counts, etc), in my opinion it would make more sense to make a totally separate ORM / Builder that's built specifically for NoSQL databases such as Mongo. Up to you!

If you end up putting something together ping me here & I'd love to check it out!

P.S. if you got the custom ORM route, you might want to leverage the field reading on Model objects we support to get a dict of all the keys and values of each Model type.