MongoCollection.distinct

import std.algorithm : equal;
import vibe.db.mongo.mongo;

void test()
{
	auto db = connectMongoDB("127.0.0.1").getDatabase("test");
	auto coll = db["collection"];

	coll.drop();
	coll.insertOne(["a": "first", "b": "foo"]);
	coll.insertOne(["a": "first", "b": "bar"]);
	coll.insertOne(["a": "first", "b": "bar"]);
	coll.insertOne(["a": "second", "b": "baz"]);
	coll.insertOne(["a": "second", "b": "bam"]);

	auto result = coll.distinct!string("b", ["a": "first"]);

	assert(result.equal(["foo", "bar"]));
}