Replace MongoDB with PosgreSQL
This implements the MongoDB wire protocol and adapts queries to work with a PostgreSQL database using jsonb fields. I've tested it with Keystone.js and it seemed to work reasonably well.
pgmongo requires node 8 or newer and Postgres 9.4+. Then run the following.
npm install -g pgmongo
pgmongo
This will start a mongo-like server on port 27017. If you already have mongo running on your machine you can start it on a different port with the following.
pgmongo localhost 27018
It's not production ready yet, but definitely working enough to play around with or use in basic apps.
Currently passes 190 of the 916 core mongo jstests.
db.createCollection('users') -> CREATE TABLE IF NOT EXISTS "users" (data jsonb)
db.users.find({ lastLogin: { $lte: '2016' } }) -> SELECT data FROM "users" WHERE data->>'lastLogin'<='2016'
db.users.update({}, { $set: { active: true } }) -> UPDATE "users" SET data = jsonb_set(data,'{active}','true'::jsonb)
db.users.find({}, { firstName: 1 } ) -> SELECT jsonb_build_object('firstName', data->'firstName', '_id', data->'_id') as data FROM "users"
db.blogs.insert({ title: 'first post', comments: [] }) -> INSERT INTO "blogs" VALUES ('{"_id":"5b45b641eb4bd93896d57888","title":"first post","comments":[]}'::jsonb)
db.blogs.remove({ 'state.trash': true }) -> DELETE FROM "blogs" WHERE data->'state'->'trash'='true'::jsonb
Note: contributions/PRs are very much welcome.
Anyone can help make this project better. Feel free to open an issue to discuss what you want to work on.