Question

我是Datomic超级新手。我正在尝试将分类法添加到我的数据库中，但是我收到的错误是我无法遵循的。错误是：

{:datomic.client-spi/request-id "c587b3e8-8f19-45f5-a563-bdba13e3a0d8",
 :cognitect.anomalies/category :cognitect.anomalies/not-found,
 :cognitect.anomalies/message
 ":db.error/not-an-entity Unable to resolve entity: {:idx -1000000, :part :db.part/db} in datom [{:idx -1000000, :part :db.part/db} :db/ident :arb/title]",
 :dbs
 [{:database-id "datomic:dev://localhost:4334/datemo",
   :t 1004,
   :next-t 1009,
   :history false}]}

以下是我正在使用的分类法：

[{:db/id #db/id [:db.part/db]
  :db/ident         :arb/title
  :db/unique        :db.unique/identity
  :db/valueType     :db.type/string
  :db/cardinality   :db.cardinality/one
  :db/fulltext      true
  :db/index         true
  :db.install/_attribute :db.part/db}

 {:db/id #db/id [:db.part/db]
  :db/ident         :arb/description
  :db/unique        :db.unique/identity
  :db/valueType     :db.type/string
  :db/cardinality   :db.cardinality/one
  :db.install/_attribute :db.part/db}

 {:db/id #db/id [:db.part/db]
  :db/ident         :arb/content
  :db/unique        :db.unique/identity
  :db/valueType     :db.type/ref
  :db/isComponent   true
  :db/cardinality   :db.cardinality/many
  :db.install/_attribute :db.part/db}]

以下是我的电话：

(def arb-tx (-> (io/resource "schemas/arb.edn") ;; the schema above
                (read-all)
                (first)))

(pprint (<!! (client/transact conn {:tx-data arb-tx})))

我很难从错误信息中理解这里究竟无法解决的问题。我认为我对引擎盖下发生的事情的理解太模糊，无法理解这里有什么问题。谁能开导我？

Answer 1

Datomic Client库不支持显式分区或架构定义中的：db.install / _attribute。在Datomic 0.9.5430之前使用Peers时需要这些元素。

尝试用以下代码替换架构定义：

[{:db/ident         :arb/title
  :db/unique        :db.unique/identity
  :db/valueType     :db.type/string
  :db/cardinality   :db.cardinality/one
  :db/fulltext      true
  :db/index         true}

 {:db/ident         :arb/description
  :db/unique        :db.unique/identity
  :db/valueType     :db.type/string
  :db/cardinality   :db.cardinality/one}

 {:db/ident         :arb/content
  :db/unique        :db.unique/identity
  :db/valueType     :db.type/ref
  :db/isComponent   true
  :db/cardinality   :db.cardinality/many}]

-Marshall

尝试处理Datomic架构时“无法解析实体”错误

1 个答案: