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This commit is contained in:
Daniel Hutzel
2025-07-16 13:59:33 +02:00
parent b55cce3e63
commit 7cd3a6d1e3
1 changed files with 7 additions and 2 deletions
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9
bookshop/srv/x-validation.cds
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@@ -29,12 +29,17 @@ view Books.constraints as select from Books { ID,
// multiple constraints: mandatory + assert target + special
not exists author ? 'Author does not exist: ' || author.ID :
author.ID is null ? 'is missing' : // FIXME: expected author.ID to refer to foreign key, apparently that is not the case -> move one line up to see
count(author.books.ID) -1 > 1 ? author.name || ' already wrote multiple books, please choose another author' : // TODO: we should support count(author.books)
author.ID is null ? 'is missing' : // FIXME: 1)
count(author.books.ID) -1 > 1 ? author.name || ' already wrote too many books' : // TODO: 2)
null as author,
} group by ID;
// 1) FIXME: expected author.ID to refer to foreign key,
// apparently that is not the case -> move one line up
// and run test to see the erroneous impact.
// 2) TODO: we should support count(author.books)
/**