How to read MongoDB nested arrays into local memory

Question

I've put a HashMap<String, Set<Long>> object into a MongoDB document under "disabled_channels" but I can't figure out how to retrieve it and turn it back into a HashMap<String, Set<Long>> object in local memory. I'm usually very good at reading in lists, individual values, etc, with something like found.getList("disabled_commands", String.class) but I'm really lost on how to approach this.

    MongoCollection<Document> collection = bot.getDataManager().getConfig();
    Document config = new Document("guild", guild.getIdLong());
    Document found = collection.find(config).first();
    // I get lost here

Gibbs · Accepted Answer · 2021-01-16 07:45:26Z

2

Document itself is a map implementation internally. Reference

You need to use get function on found document and cast it to Document as below

Document channels = (Document)found.get("disabled_channels")

Then you can access elements in channels using the same get method and cast it as per the need.

answered Jan 16, 2021 at 7:45

Gibbs

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