我有几类课程,例如: band , Album , Song , title (有时称为 name )和 slug ,以及其他类别特定的字段。
我想用南方将其转换成共同基类( article )的孩子,该类包含每个对象的 标题 和 slug 。 但是,我不知道南方的数据迁移在我的案例中应该如何运作; 您能帮助吗?
你只需要考虑一下南方对你的模型的改变, 并计划一下。
如果 article 是抽象的类别, 南方将基本上不理会它。 也就是说, 所有字段都看起来像是直接在模型上的字段, 大致上是现在的你。 因此, 唯一会发生的变化是某个模型之前使用 < code> name 的域, 现在它将有一个新的 < code> 标题 字段。 因此, 您应该离开通过系统迁移连接的 < code> name 字段, 然后创建数据迁移, 将其值移动到新的 < code> title 字段, 最后将其移到 < em> another schegragration 域。
如果 article 是标准基级(多式继承), 那么您的所有模型都会在文章中找到一个新的 < code> OneToOne Field 。 再一次, 通过系统迁移, 将所有域都留在您的模型上, 然后创建数据迁移, 从而您将运行于每个模型中, 并使用该模型上的旧数据创建 < code> article 例, 并将 < code> article < /code> 例指定为一对一字段。 然后, 您可以在另一个系统迁移中删除旧字段 。
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