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_unknown`

Patch names a field the entity or its input doesn't have.

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

Each field of a patch's input is one of the entity's, and when_supplied: names the input's fields:

example

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

jadpo checkcheck failed: 1 error, 1 file

error ItemChanges has title, which Item doesn't

--> main.jadpo:18:16

   |18 |         patch: amendment   |                ^^^^^^^^^ `ItemChanges`

reason: A patch sets each field its input supplies on the field of Item with the same name, so every field of ItemChanges is one of Item's.
next: Remove title from ItemChanges (agent)
rule: data.patch_field_unknown
help: https://jadpo.dev/docs/errors/data.patch_field_unknown

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