Jadpo is experimental and not ready for production. These docs follow the compiler's main branch as of 5 Nov 2026. What's built · Install 0.3.0

ReferenceErrors

Errors Reads and writes · rule

`data.patch_field_required`

Patch input has a field that isn't optional.

Area 6, Reads and writes; not declinable; the next step is usually the agent's.

example

type ItemName = Text {    max_length: 80}entity Item {    id: Uuid    name: ItemName}type ItemChanges = Input {    pick: [Item.name]}action edit(item: Item, amendment: ItemChanges) -> Item {    return Item.update(item) {        patch: amendment    }}

jadpo checkcheck failed: 1 error, 1 file

error ItemChanges.name isn't optional, so a patch can't leave it out

--> main.jadpo:16:16

   |16 |         patch: amendment   |                ^^^^^^^^^ `ItemChanges`

reason: A patch changes only the fields a request supplied, so each field of its input is optional: one left out keeps its value. A required name would have to be sent every time.
next: Make name optional in ItemChanges (optional: true, or optional: all), or set it with set: (agent)
rule: data.patch_field_required
help: https://jadpo.dev/docs/errors/data.patch_field_required

Markdown for agents: /docs/errors/data.patch_field_required.md.Built from Jadpo main at aee2e8f.