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update Ex: 9.27 instruction to use Zod library #3856

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19 changes: 10 additions & 9 deletions src/content/9/en/part9e.md
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Expand Up @@ -402,17 +402,18 @@ Remember that we have different kinds of entries in our app, so our backend shou

In this exercise, you quite likely need to remember [this trick](/en/part9/grande_finale_patientor#omit-with-unions).

You may assume that the diagnostic codes are sent in the correct form and use eg. the following kind of parser to extract those from the request body:
You may define a Zod [array](https://zod.dev/?id=arrays) schema for the diagnostic codes and use it appropriately in other Zod [objects](https://zod.dev/?id=objects) as follows:

```js
const parseDiagnosisCodes = (object: unknown): Array<Diagnosis['code']> => {
if (!object || typeof object !== 'object' || !('diagnosisCodes' in object)) {
// we will just trust the data to be in correct form
return [] as Array<Diagnosis['code']>;
}

return object.diagnosisCodes as Array<Diagnosis['code']>;
};
const DiagnosisCodesSchema = z
.array(z.string())
.optional()
.transform((codes) => (codes ? codes : []));

const BaseHealthEntrySchema = z.object({
...
diagnosisCodes: DiagnosisCodesSchema,
})
```

#### 9.28: Patientor, step 8
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