cherrypick/tools/migration/nighthike/5.js

// for Node.js interpret

const { default: Post } = require('../../../built/models/post');
const { default: zip } = require('@prezzemolo/zip')

const migrate = async (post) => {
	const result = await Post.update(post._id, {
		$set: {
			'geo.type': 'Point',
			'geo.coordinates': [post.geo.longitude, post.geo.latitude]
		},
		$unset: {
			'geo.longitude': '',
			'geo.latitude': '',
		}
	});
	return result.ok === 1;
}

async function main() {
	const count = await Post.count({
		'geo': { $ne: null }
	});

	const dop = Number.parseInt(process.argv[2]) || 5
	const idop = ((count - (count % dop)) / dop) + 1

	return zip(
		1,
		async (time) => {
			console.log(`${time} / ${idop}`)
			const doc = await Post.find({
				'geo': { $ne: null }
			}, {
				limit: dop, skip: time * dop
			})
			return Promise.all(doc.map(migrate))
		},
		idop
	).then(a => {
		const rv = []
		a.forEach(e => rv.push(...e))
		return rv
	})
}

main().then(console.dir).catch(console.error)