operation_outcome — Turn validation results into a FHIR OperationOutcome

Run with:

cargo run --example operation_outcome

Resource::validate() returns a Vec<ValidationIssue>. A FHIR server that rejects a request reports problems as an OperationOutcome, and this crate provides a From<Vec<ValidationIssue>> bridge so validation output drops straight into that resource.

The program#

use fhir::r5::coded::Coded;
use fhir::r5::resources::Patient;
use fhir::r5::resources::operation_outcome::OperationOutcome;
use fhir::r5::types::Uri;
use fhir::r5::validate::Validate;

fn main() {
    // A patient with two problems: an out-of-value-set gender code, and a `uri`
    // surrounded by whitespace.
    let mut patient = Patient {
        gender: Some(Coded::Unknown("robot".to_string())),
        ..Default::default()
    };
    patient.implicit_rules = Some(Uri(" http://example.org/bad ".to_string()));

    let issues = patient.validate();
    println!("{} validation issue(s)", issues.len());

    // Bridge the issues into an OperationOutcome and serialize it.
    let outcome: OperationOutcome = issues.into();
    let json = serde_json::to_string_pretty(&outcome).expect("serialize OperationOutcome");
    println!("{json}");

    // Every entry is an `error`-severity, `invalid`-code issue.
    for issue in &outcome.issue {
        assert_eq!(
            issue.severity,
            Coded::Known(fhir::r5::codes::IssueSeverity::Error)
        );
        let path = &issue.expression[0].0;
        let msg = issue.diagnostics.as_ref().unwrap();
        println!("- {path}: {}", msg.0);
    }
}

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