transaction_bundle — Build a FHIR transaction Bundle and read resources back out of one

Run with:

cargo run --example transaction_bundle

A transaction Bundle batches several create/update/delete operations into a single request. Bundle::transaction() builds one; Bundle::iter_resources and Bundle::resources::<T> read resources back out, and Bundle::next_link follows search paging.

The program#

use fhir::r5::resources::{Bundle, Patient};
use fhir::r5::types::String as FhirString;

fn main() {
    let patient = Patient::builder()
        .id(FhirString("pat-1".to_string()))
        .build()
        .expect("build patient");

    // Build a transaction: create one patient, delete another.
    let bundle = Bundle::transaction()
        .create(&patient, "Patient")
        .delete("Patient/old-1")
        .build();

    let json = serde_json::to_string_pretty(&bundle).expect("serialize");
    println!("transaction bundle:\n{json}\n");

    // Read a search bundle and iterate its resources.
    let search: Bundle = serde_json::from_value(serde_json::json!({
        "resourceType": "Bundle",
        "type": "searchset",
        "link": [{ "relation": "next", "url": "http://server/fhir/Patient?page=2" }],
        "entry": [
            { "resource": { "resourceType": "Patient", "id": "a" } },
            { "resource": { "resourceType": "Patient", "id": "b" } },
            { "resource": { "resourceType": "Observation", "id": "o",
                            "status": "final", "code": {} } }
        ]
    }))
    .expect("parse search bundle");

    println!("resources in bundle: {}", search.iter_resources().count());
    let patients: Vec<Patient> = search.resources::<Patient>("Patient").collect();
    println!("patients: {}", patients.len());
    if let Some(next) = search.next_link() {
        println!("next page: {next}");
    }
}

Source: fhir/examples/transaction_bundle.rs in the repository.