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ORM on FHIR: Mapping FHIR Entities to Code

Developers can write raw SQL queries with string interpolation — but they don’t like it. They prefer using ORMs because they get type safety, IDE support, less boilerplate, database agnosticism, easier schema maintenance, etc. The same logic applies to FHIR.

In this talk, I’ll describe the motivation and challenges of building such an “ORM,” introduce TypeSchema — our approach to generating SDKs from FHIR Implementation Guides — and share our roadmap for making it production-ready.

Aleksandr Penskoi, Health Samurai Engineer.

---

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{
  "identifier": {
    "kind": "resource",
    "package": "hl7.fhir.r4.core",
    "version": "4.0.1",
    "name": "Patient",
    "url": "http://hl7.org/fhir/StructureDefinition/Patient"
  },
  "base": {
    "kind": "resource",

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// WARNING: This file is autogenerated by FHIR Schema Codegen.
// https://github.com/fhir-schema/fhir-schema-codegen
// Any manual changes made to this file may be overwritten.

import { Address } from './Address';
import { Attachment } from './Attachment';
import { BackboneElement } from './BackboneElement';
import { CodeableConcept } from './CodeableConcept';
import { ContactPoint } from './ContactPoint';
import { DomainResource } from './DomainResource';

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data Code = Add | Div

class Compiler a where
    compile :: Code -> (String, String) -> String

instance Compiler Float where
    compile Add (a, b) = show (Unsafe.read a + Unsafe.read b :: Float)
    compile Div (a, b) = show (Unsafe.read a / Unsafe.read b :: Float)

instance Compiler Int where

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{ "keys": ["alt+j"], "command": "do_after_mark", "args": {"command": "copy"}, "context": [{ "key": "setting.with_marker" }] },
{ "keys": ["alt+h"], "command": "move", "args": {"by": "characters", "forward": false, "extend": true}, "context": [{ "key": "setting.with_marker" }] }

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import sublime, sublime_plugin

class ClearMarkCommand(sublime_plugin.TextCommand):
    def run(self, edit):
        self.view.run_command("clear_bookmarks", {"name": "mark"})
        self.view.settings().set('with_marker', False)

class DoAfterMarkCommand(sublime_plugin.TextCommand):
    def run(self, edit, command, args = {}):
        self.view.run_command("clear_mark")

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test

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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>

struct List {
  struct List *next;
  int value;
};

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class Foo(val bar:Bar) {
  def this() = this(new Bar)
}

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module Main where

import qualified Data.ByteString as B
import Cmd
import System.Environment   
import Data.Array

newState = State { pmem = B.empty
                 , dmem = array (0, 255) $ take 256 $ zip [0,1..] [0,0..]
                 , pc   = 0x00