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creating_collections.md

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Creating Collections

A database may have many collections. To create a collection, we can use create_collection of Database

let db = Database::open_memory().unwrap();
db.create_collection("name_of_the_collection").unwrap();

where name_of_the_collection is the name (of the created collection) that is used for accessing the collection later.

The other way to create a collection is by using collection of Database.

let db = Database::open_memory().unwrap();
let collection = db.collection("name_of_the_collection");

Yet, this method does not actually create a collection. It only creates a collection after a document is inserted.

Sometimes, we need to specify explicitly a type of Collection. In this case, we can use Collection<Document>, which is also the default type of Collection.

use polodb_core::{bson::Document, Collection, Database};

fn main() {
    let db = Database::open_memory().unwrap();
    let _collection: Collection<Document> = db.collection("name_of_the_collection");
}

➡️ Next: Obtaining Collections

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