first_or_create 与 find_or_create_by [英] first_or_create vs find_or_create_by

问题描述

first_or_create 的文档似乎少得多，所以我想知道这是否仅仅是因为这两种方法是同义词.

first_or_create seems much less documented, so I wondered if it was just because the two methods are synonymous.

推荐答案

基本上:

Foo.where(attributes).first_or_create

等同于:

Foo.find_or_create_by(attributes)

<小时>

#first_or_create 有时会被误解，因为人们期望它根据给定的属性进行搜索，但事实并非如此.阿卡

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#first_or_create is sometimes misunderstood as people expect it to search by the attributes given, but that is not the case. Aka

Foo.first_or_create(attributes)

不会搜索满足 attributes 的 foo.如果有的话，它将使用第一个 foo.如果查找条件是用于创建的条件的子集，则很有用.阿卡

Will not search for a foo that satisfies the attributes. It will take the first foo if any are present. It's useful if the conditions for finding are a subset of those used for creation. Aka

Foo.where(something: value).first_or_create(attributes)

将找到第一个 foo 其中 something: value.如果不存在，它将使用 attributes 来创建它.

Will find the first foo where something: value. If none is present, it will use attributes to create it.

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