将属性添加到现有数据模式

Question

我正在尝试将属性添加到现有数据模式，新属性是

  {:db/id #db/id[:db.part/db]
  :db/ident :user-deets/enriched
  :db/valueType :db.type/boolean
  :db/cardinality :db.cardinality/one
  :db.install/_attribute :db.part/db}

当我尝试将其作为交易提交时（如 http://docs.datomic.com/schema.html 所述），使用以下内容

(datomic/query '[{:db/id #db/id[:db.part/db]
      :db/ident :user-deets/enriched
      :db/valueType :db.type/boolean
      :db/cardinality :db.cardinality/one
      :db.install/_attribute :db.part/db}] (database/get-db))

我收到一条错误消息，指出我的查询中没有 :find 子句。

我应该如何提交此事务才能将属性添加到我的数据数据库架构中？

Answer 1

您的代码无法正常工作，因为您使用了错误的函数。

您想使用 transact See doc.

(datomic/transact connection [{:db/id #db/id[:db.part/db]
  :db/ident :user-deets/enriched
  :db/valueType :db.type/boolean
  :db/cardinality :db.cardinality/one
  :db.install/_attribute :db.part/db}])

Answer 2

为了更轻松地创建属性和使用其他 Datomic 功能，您不妨尝试 the Tupelo Datomic library。它将允许您创建这样的属性：

(:require [tupelo.datomic :as td])

  ; Create some new attributes. Required args are the attribute name (an optionally namespaced
  ; keyword) and the attribute type (full listing at http://docs.datomic.com/schema.html). We wrap
  ; the new attribute definitions in a transaction and immediately commit them into the DB.
  (td/transact *conn* ;   required              required              zero-or-more
                      ;  <attr name>         <attr value type>       <optional specs ...>
    (td/new-attribute   :person/name         :db.type/string         :db.unique/value)      ; each name      is unique
    (td/new-attribute   :person/secret-id    :db.type/long           :db.unique/value)      ; each secret-id is unique
    (td/new-attribute   :weapon/type         :db.type/ref            :db.cardinality/many)  ; one may have many weapons
    (td/new-attribute   :location            :db.type/string)     ; all default values
    (td/new-attribute   :favorite-weapon     :db.type/keyword ))  ; all default values

在您的情况下，这将简化为

(td/transact (database/get-db)
  (td/new-attribute :user-deets/enriched :db.type/boolean))

将属性添加到现有数据模式

Add attribute to existing datomic schema

clojure

schema

datomic