data.field_without_json: Structured field holds a type with no stored JSON form

Structured field holds a type with no stored JSON form.

Area 5, Entities, stores and migrations; not declinable; the next step is usually the agent's.

A structured field is stored as its type's JSON, so everything inside it has a stored form: no event, failure, email, message, prompt, Input or Output, and no map keyed by a type with no single text form.

example

type Tag = Text {    max_length: 20}/// A parcel was sent.type ParcelSent = Event {    label: Tag}/// What a parcel's shipments hold.type Shipments = Object {    sent: List<ParcelSent>}entity Parcel {    id: Uuid    shipments: Shipments}

jadpo checkcheck failed: 1 error, 1 file

error Parcel.shipments can't be stored as JSON

--> main.jadpo:17:16

   |17 |     shipments: Shipments   |                ^^^^^^^^^ `ParcelSent` has no stored form

reason: A structured field is stored whole as jsonb holding its type's JSON, made of values built on the built-in and standard types, enums, and objects made of them, in lists, sets and maps; Parcel.shipments holds ParcelSent, an event, which is emitted, not written.
next: Store what Parcel.shipments needs in an Object of the application's, or in fields of its own (agent)
rule: data.field_without_json
help: https://jadpo.dev/docs/errors/data.field_without_json