fhir 1.2.0

Fast Healthcare Interoperability Resources (FHIR) data model for Rust: the complete FHIR R5, R4, and R3 resources, datatypes, and code systems as serde-serializable types, plus a spec-driven code generator.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

//! Read and write FHIR extensions ergonomically with `ExtensionExt`.
//!
//! Run with:
//!
//! ```sh
//! cargo run --example extensions
//! ```
//!
//! Extensions are a `Vec<Extension>` keyed by `url`. The `ExtensionExt` trait
//! (in the prelude) adds `extension(url)`, `extensions(url)`, `set_extension`,
//! and `add_extension` to every resource and datatype that carries them.

use fhir::prelude::*;
use fhir::r5::choice::Primitive;
use fhir::r5::types::extension::ExtensionValue;

const EYE_COLOR: &str = "http://example.org/fhir/StructureDefinition/eye-color";

fn main() {
    let mut patient = Patient::default();

    // Set an extension (replaces any existing one with the same url).
    patient.set_extension(Extension {
        url: FhirString(EYE_COLOR.to_string()),
        value: Some(ExtensionValue::String(Primitive::new(FhirString(
            "blue".to_string(),
        )))),
        ..Default::default()
    });

    // Read it back by url.
    if let Some(ext) = patient.extension(EYE_COLOR)
        && let Some(ExtensionValue::String(p)) = &ext.value
    {
        println!("eye color: {}", p.value.0);
    }

    // Setting again replaces rather than duplicates.
    patient.set_extension(Extension {
        url: FhirString(EYE_COLOR.to_string()),
        value: Some(ExtensionValue::String(Primitive::new(FhirString(
            "green".to_string(),
        )))),
        ..Default::default()
    });
    println!("extensions with that url: {}", patient.extensions(EYE_COLOR).len());

    let json = serde_json::to_string_pretty(&patient).expect("serialize");
    println!("{json}");
}