Rails 中的多对多关联数据表
多对多关联,是 Rails 中相对复杂的一种关系表。为了便于管理,往往都会创建一个 中间表,用来记录关联表之间的关系。
多对多关联,是 Rails 中相对复杂的一种关系表。为了便于管理,往往都会创建一个 中间表,用来记录关联表之间的关系。
ActiveRecord 是 Rails 重要的组件之一,也是 Rails 的重要特色。它抽象化了数据的 管理,使用户可以不懂 SQL 而操作数据库。Migration 就是 Rails 驱动数据库操作数 据库的重要 ActiveRecord 工具。
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kramdown 不是 markdown,是对 markdown 的 基于 Ruby 语言的重写和扩展!
Rails 是以 Gem 形式发布的,所以在安装好 Ruby 以后,就已经安装了 Gem 管理系统。再安装 Rails 就比较简单了。
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