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active-record-associations-and-migrations-nyc04-seng-ft-030920
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2021-04-02
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活动记录协会简介:播放列表 目标 了解Active Record如何以及为什么实现模型之间的关联。 使用Active Record迁移和方法构建域模型,该域模型通过has-many / belongs-to和many-to-many(或has-man-through)关系来关联类。 什么是活动记录关联? 我们已经知道我们可以构建我们的类,使它们彼此关联。 我们也知道,这样做需要很多代码。 Active Record关联使我们能够关联模型及其类似的数据库表,而无需编写大量代码。 此外,Active Record关联使与我们的关联对象的实际工作更加快捷,整洁和容易。 听起来不错,对吗? 现在我们已经完全迷住了,让我们看一下我们如何使用这些AR关联。 我们如何使用AR关联? 使用Active Record可以轻松实现模型之间的以下关系: 属于 has_one 有很多 has_man
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