Question

到目前为止，我的add-post-to-datomic方法看起来像

(defn add-post-to-datomic [title, content, useremail]
  (d/transact conn [{:db/id (d/tempid :db.part/user),
                     :post/title title,
                     :post/content content,
                     :author/email useremail}]))

我真的想添加添加潜在可变数量标签的功能。

在我的awesome-schema.edn中我有

{:db/id #db/id[:db.part/db]
 :db/ident :post/tag
 :db/valueType :db.type/string
 :db/cardinality :db.cardinality/many
 :db/doc "tag applied to a post"
 :db.install/_attribute :db.part/db}

因为基数设置为很多，所以如果数据库中存在多个，那就没问题了。

如何编写上述方法以适用于可变数量的标签？

Answer 1

查看“Cardinality many transactions”下的Transactions Docs。只要你传递一组标签，这应该有效：

(defn add-post-to-datomic [title content user-email tag-set]
  (d/transact conn [{:db/id (d/tempid :db.part/user)
                     :post/title title
                     :post/content content
                     :post/tag tag-set
                     :author/email user-email}]))

将多个常规属性/值插入到datomic db

1 个答案: