mgq

MongoDB query as a predicate function.

This aims to be consistent with how MongoDB's matches documents. This includes traversal across nested dicts and lists, None and field-presence/absence handling.

JavaScript port of mgqpy.

import { Query } from "mgq";

const predicate = Query({ "foo.bar": { $gt: 1 } });

const inputs = [
  { foo: [{ bar: [1, 2] }] },
  { foo: { bar: 1 } },
  { foo: { bar: 2 } },
  { foo: null },
];

const filtered = inputs.filter(predicate.test);

assert.deepEqual(filtered, [{ foo: [{ bar: [1, 2] }] }, { foo: { bar: 2 } }]);

Supported operators

Comparison query operators

• [x] $eq
• [x] $eq (implicit), e.g. {"foo": None}
• [x] $ne
• [x] $gt
• [x] $gte
• [x] $lt
• [x] $lte
• [x] $in
• [x] $nin

Logical query operators

• [x] $and
• [x] $and (implicit), e.g. {"foo": 1, "bar": "baz"}
• [x] $or
• [x] $not
• [x] $nor

Evaluation query operators

• [x] $regex
• [x] $regex (implicit), e.g. {"foo": re.compile('^bar')}
• [x] $mod
• [x] $where

Array query operators

• [x] $all
• [x] $elemMatch
• [x] $size