finding_all_documents.md

Finding All Documents

We can use find of Collection to retrieve all documents in a collection. The method find receives a parameter for filters. Currently, we can use None for no filters. We then use a for loop to go through all the documents found.

let docs_found = collection.find(None).unwrap();
for doc in docs_found {
    println!("{:#?}", doc.unwrap());
}

The complete code is provided below:

use polodb_core::{bson::doc, Database};

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

    let docs = [
        doc! {
            "Name": "Alice",
            "Age": 20,
        },
        doc! {
            "Name": "Bob",
            "Height": 180,
        },
    ];
    collection.insert_many(docs).unwrap();
    
    let docs_found = collection.find(None).unwrap();
    for doc in docs_found {
        println!("{:#?}", doc.unwrap());
    }
}

Output:

Document({
    "Name": String(
        "Alice",
    ),
    "Age": Int32(
        20,
    ),
    "_id": ObjectId(
        "66b610fb9d9613d5f5533aa5",
    ),
})
Document({
    "Name": String(
        "Bob",
    ),
    "Height": Int32(
        180,
    ),
    "_id": ObjectId(
        "66b610fb9d9613d5f5533aa6",
    ),
})

For each document, there is an entry _id, which is the unique id of the document and is created automatically.

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