Question

使用Lobos，我的迁移看起来像：

(defmigration company-table
  (up [] (create
          (tbl :companies
               (text name))))
  (down [] (drop
            (table :companies))))

(defmigration document-table
  (up [] (create
          (tbl :documents
               (timestamp :date_of_event)
               (text :title)
               (text :name)
               (refer-to :companies))))
  (down [] (drop
            (table :documents))))

我想在文件s.t上设置参考。引用列名称是company_id，例如(refer-to :companies as :company_id)。我该怎么做？

Answer 1

documentation看起来不是很好，但有两种方法可以做到这一点：

使用foreign-key功能

(defmigration document-table
  (up [] (create
          (table :documents
               (timestamp :date_of_event)
               (text :title)
               (text :name)
               (foreign-key :company-id :companies))))
;; or, if you need to specify options, you'd use something like this
               (foreign-key :company-id :companies :on-delete :cascade))))

使用[:refer tname & options]选项。

(defmigration document-table
  (up [] (create
          (table :documents
               (timestamp :date_of_event)
               (text :title)
               (text :name)
               (integer :company-id [:refer companies]))))
;; or, if you need to specify options, you'd use something like this
               (integer :company-id [:refer companies :on-delete :cascade]))))

修改另外，除非您定义了自己的函数tbl，否则您可能意味着table

编辑2：文档here看起来好多了。

如何在Lobos中设置引用列值？

1 个答案: