clojure – 如何使用enum / ref的实体ID执行Datomic事务？

2019年7月22日 223次阅读

我正在尝试将新实体插入到我的Datomic数据库中,并引用我创建的枚举/ ref类型(：client / gender和：client / referral).

：client / referral类型的模式条目如下所示(并且：client / gender定义几乎相同)：

{:db/id #db/id[:db.part/db]
  :db/ident :client/referral
  :db/valueType :db.type/ref
  :db/cardinality :db.cardinality/one
  :db/doc "The referral source for this client"
  :db.install/_attribute :db.part/db
  }

[:db/add #db/id[:db.part/user] :db/ident :client.referral/friend]
[:db/add #db/id[:db.part/user] :db/ident :client.referral/online]
[:db/add #db/id[:db.part/user] :db/ident :client.referral/radio]

事务函数看起来像这样(我已经尝试了各种变体)：

(defn add-client [client]
  (let [gender (:gender client)
        referral (:referral client)]
    @(d/transact conn
      [{:db/id (d/tempid :db.part/user)
       :client/name (:name client)
       :client/phone (:phone client)
       :client/email (:email client)
       :client/date-of-birth (:dateOfBirth client)
       :client/gender gender
       :client/referral referral}])))

此特定变体会产生以下错误：

java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: :db.error/not-an-entity Unable to resolve entity: 17592186045422 in datom [#db/id[:db.part/user -1000022] :client/gender "17592186045422"]
              ...
Caused by: datomic.impl.Exceptions$IllegalArgumentExceptionInfo: :db.error/not-an-entity Unable to resolve entity: 17592186045422 in datom [#db/id[:db.part/user -1000022] :client/gender "17592186045422"]
                error.clj:57 datomic.error/arg
                error.clj:55 datomic.error/arg
                  db.clj:555 datomic.db/require-id
                 db.clj:2334 datomic.db/datomic.db.ProcessInpoint
                 db.clj:2317 datomic.db/datomic.db.ProcessInpoint
                 db.clj:2512 datomic.db/with-tx[fn]
   PersistentVector.java:333 clojure.lang.PersistentVector.reduce
               core.clj:6518 clojure.core/reduce
                 db.clj:2512 datomic.db/with-tx[fn]
                 db.clj:2516 datomic.db/with-tx
                peer.clj:558 datomic.peer.LocalConnection/fn
                peer.clj:558 datomic.peer/datomic.peer.LocalConnection
                peer.clj:550 datomic.peer/datomic.peer.LocalConnection
                  api.clj:94 datomic.api/transact
                   ...

我也试过这样的变化(除其他外)但无济于事：

@(d/transact conn
      [{:db/id (d/tempid :db.part/user)
       :client/name (:name client)
       :client/phone (:phone client)
       :client/email (:email client)
       :client/date-of-birth (:dateOfBirth client)
       :client/gender #db/id[:db.user/part gender]
       :client/referral #db/id[:db.user/part referral]}])

什么,可能是显而易见的,我错过了什么？

最佳答案 您的输入数据是错误来源.观察抛出的异常中报告的数据的值位置中的字符串.

[#db/id[:db.part/user -1000022] :client/gender “17592186045422”]

它应该是性别实体的实体ID或通过以下方式标识它的关键字：db / ident.

确保您的交易内容如下：

[:db/add (d/tempid :db.part/user) :client/gender :gender/male]

(假设您有一个实体：db / ident：gender / male)

(旁注：您的头像图片,Clojure徽标,我相信是受版权保护的)

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