77 lines
2.6 KiB
Plaintext
77 lines
2.6 KiB
Plaintext
using { AdminService, sap.capire.bookshop as my } from './admin-service';
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extend service AdminService with {
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// entity Books.drafts as projection on AdminService.Books;
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// @cds.api.ignore view Books.drafts.constraints as select from AdminService.Books.drafts mixin {
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// before: Association to my.Books on before.ID = $self.ID;
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// base: Association to my.Books on base.ID = $self.ID;
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// } into { ID, // FIXME: compiler should resolve Books without AdminService prefix
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// case
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// when title is null then 'is missing'
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// when trim(title)='' then 'must not be empty'
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// end as title,
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// ...
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// }
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/**
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* Validation constraints for Books
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*/
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@cds.api.ignore view Books.constraints as select from AdminService.Books mixin {
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base: Association to my.Books on base.ID = $self.ID;
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} into { ID, // FIXME: compiler should resolve Books without AdminService prefix
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// two-step mandatory check
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case
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when title is null then 'is missing'
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when trim(title)='' then 'must not be empty'
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end as title,
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// the above is equivalent to:
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// title is null ? 'is missing' : trim(title)='' ? 'must not be empty' :
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// range check
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stock < 0 ? 'must not be negative' :
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null as stock,
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// range check
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price < 0 ? 'must not be negative' :
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null as price,
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// assert target check
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genre.ID is not null and not exists genre ? 'does not exist' :
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null as genre,
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// multiple constraints: mandatory + assert target + special
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author.ID is null ? 'is missing' : // FIXME: 1) // TODO: 2)
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not exists author ? 'Author does not exist: ' || author.ID :
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count(base.author.books.ID) -1 > 1 ? author.name || ' already wrote too many books' : // TODO: 3)
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null as author,
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} group by ID;
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// 1) FIXME: expected author.ID to refer to foreign key,
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// apparently that is not the case -> move one line up
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// and run test to see the erroneous impact.
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// 2) TODO: we should allow to write author is null instead of author.ID is null
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// 3) TODO: we should support count(author.books)
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/**
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* Validation constraints for Authors
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*/
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view Authors.constraints as select from AdminService.Authors { ID, // FIXME: compiler should resolve Authors without AdminService prefix
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// two-step mandatory check
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name = null ? 'is missing' : trim(name)='' ? 'must not be empty' :
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null as name,
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// constraint related to two fields
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dateOfDeath > dateOfBirth ? 'we must be born before we die' : null as _born_before_death,
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$self._born_before_death as dateOfBirth,
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$self._born_before_death as dateOfDeath,
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}
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}
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