query.optional_value: Condition compares with a value that may be absent, or where_present: with one that is always there

Condition compares with a value that may be absent, or where_present: with one that is always there.

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

example

type Title = Text {    max_length: 80}entity Book {    id: Uuid    title: Title    subtitle: Title?    available: Bool}type FindBooks = Input {    title: Title {        optional: true    }}query find_books(filter: FindBooks) -> List<Book> {    from: Book    where: Book.title == filter.title    order: [Book.id asc]    limit: 20}

jadpo checkcheck failed: 1 error, 1 file

error filter.title may be absent, so this where: line can't always be met

--> main.jadpo:20:26

   |20 |     where: Book.title == filter.title   |                          ^^^^^^^^^^^^ may be `none`

reason: A where: line applies to every call; a condition that should apply only when its value is there, as a request's optional filter, is written with where_present:.
next: Write where_present: for this condition (agent)
rule: query.optional_value
help: https://jadpo.dev/docs/errors/query.optional_value