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

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

Logical query operators

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

Evaluation query operators

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

Array query operators

• $all
• $elemMatch
• $size