Enums datomic中的多个枚举

是否可以在datomic中向属性添加多个枚举？比如：

[{:artist/name "Leonard Cohen"
  :artist/countries  [:country/GR :country/CA] }

在这种情况下，我得到的是 “：db.error/not-an-attribute:country/GR不是属性”

然而

[{:artist/name "Leonard Cohen"
  :artist/countries  :country/GR  }

会起作用的

请查看。简言之，添加多个

enum

属性时，需要将它们包装在一个集合中，而不是向量中：

; Create some antagonists and load them into the db.  We can specify some of the
; attribute-value pairs at the time of creation, and add others later. Note that
; whenever we are adding multiple values for an attribute in a single step (e.g.
; :weapon/type), we must wrap all of the values in a set. Note that the set
; implies there can never be duplicate weapons for any one person.  As before,
; we immediately commit the new entities into the DB.
(td/transact *conn*
  (td/new-entity { :person/name "James Bond" :location "London"     :weapon/type #{ :weapon/gun :weapon/wit   } } )
  (td/new-entity { :person/name "M"          :location "London"     :weapon/type #{ :weapon/gun :weapon/guile } } )
  (td/new-entity { :person/name "Dr No"      :location "Caribbean"  :weapon/type    :weapon/gun                 } ))

---

：artist/countries

属性的架构定义如何？@GuillermoWinkler:[{:db/ident:artist/countries:db/valueType:db.type/ref:db/cardinality:db.cardinality/many