You might want to post this
at https://groups.google.com/forum/#!topic/datomic instead...
On Tuesday, January 31, 2017 at 1:16:02 PM UTC-6, Dmitry Lipovoi wrote:
>
> Hey everyone,
>
> Im trying to express following requirements in datomic schema: person may
> have many emails, but no two persons should share the same email.
>
> What comes to mind at first:
>
> {:db/ident :person/email
> :db/valueType :db.type/string
> :db/cardinality :db.cardinality/many
> :db/unique :db.unique/identity ; or :db.unique/value, not sure what
> is better
> }
>
> But documentation [1] states that "only :db.cardinality/one attributes can
> be unique". Still this schema is accepted by datomic, and AFAICT works as I
> expect.
>
> Could someone clarify why unique is declared to be cardinality/one only?
> And what approach better suits to my problem?
>
> Thanks in advance.
>
> [1] http://docs.datomic.com/identity.html#sec-4
>
>
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