.build、.create 和 .create 之间的区别！什么时候应该使用它们? [英] The differences between .build, .create, and .create! and when should they be used?

问题描述

所以我最近看到人们越来越多地在他们的控制器中使用 .build、.create 和 .create!.与仅使用 .new 并传递 param'd 对象然后 .save 有什么区别?有优点和缺点吗?使用这些其他方法会带来好处吗?

So I've been seeing people using .build, .create, and .create! within their controllers more and more lately. What's the difference from just using .new and passing the param'd object and then .save? Are there pros and cons? Does using these other methods offer benefits?

推荐答案

有一些差异，但并不大:

There are a couple differences, but they're not big:

1. .create 等价于 .new 后跟 .save.只是更简洁.
2. .create! 等价于 .new 后跟 .save! (如果保存失败则抛出错误).它也只是短了一点
3. 我认为.build主要是.new的别名.它在 Rails 3 中以一种方式运行，在 Rails 中以另一种方式运行 <3.x

1. .create is equivalent to .new followed by .save. It's just more succinct.
2. .create! is equivalent to .new followed by .save! (throws an error if saving fails). It's also just a wee bit shorter
3. I think .build is mostly an alias for .new. It works one way in Rails 3 and another way in Rails < 3.x

然而，最重要的部分是可以通过关联(has_many 等)调用这些方法以自动链接两个模型.

The most important part, however, is that these methods can be called through an association (has_many, etc.) to automatically link the two models.

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