How does generator function for collection work?

[caramboleyo]

In the readme you say collection can be an array or a generator function, but when i put a generator func in, it just loops infinite and the function actually gets never called:

import { Query } from 'https://esm.sh/mingo@6.1.2';

function* generatorStream() {
	console.log('generator start');
	yield { key: 1 };
	yield { key: 2 };
	yield { key: 3 };
}
console.log('START');
const query = new Query({ key: 2 });
const cursor = query.find(generatorStream);
console.log(cursor.next());
console.log('END');

As i read in another issue, i think this also will not be possible right? Because i get every data item from a file stream and of course have to wait until its here:

import { Query } from 'https://esm.sh/mingo@6.1.2';

async function* generatorStream() {
	console.log('generator start');
	yield Promise.resolve({ key: 1 });
	yield Promise.resolve({ key: 2 });
	yield Promise.resolve({ key: 3 });
}
console.log('START');
const query = new Query({ key: 2 });
const cursor = query.find(generatorStream);
console.log(await cursor.next());
// for await (const result of cursor) {}
console.log('END');

[kofrasa]

You must invoke the generator. Since there is no general way to detect a generator, the user must explicitly initialize it. Also the library does not support async processing. Try the following.

console.log('START');
const query = new Query({ key: 2 });
const cursor = query.find(generatorStream());
console.log(cursor.next());
// for await (const result of cursor) {}
console.log('END');

[caramboleyo]

Aaah, yes that works :)