MongoDB替换特定的数组值 [英] MongoDB Replace specific array values

问题描述

在MongoDB中，我有一个电影收藏，其中包含多种语言，例如
languages: [0:USA, 1: German, 2: French, ...etc]

In MongoDB, I have a movie collection that has an array of languages , e.g.
languages: [0:USA, 1: German, 2: French, ...etc]

数组值没有任何特定顺序.

The array values are not in any particular order.

现在如何基于某些特定值更新数组值?假设我要更新所有法语"并将整个集合替换为"Francais".我该怎么办?

How can I now update an array value based on some specific value? Let's say I want to update all "French" and replace it with "Francais" for the entire collection. How can I do that?

推荐答案

使用位置$运算符，它标识languages数组中要更新的元素，而无需显式指定其在数组中的位置，即代替预先知道位置并将元素更新为:

Use the positional $ operator which identifies the element in the languages array to update without explicitly specifying its position in the array i.e. instead of knowing the position in advance and updating the element as:

db.movies.updateMany(
    { "languages": "French" }, 
    { "$set": { "languages.2": "Francais" } }
)

您可以只使用 $ 运算符为:

you can just use the $ operator as:

db.movies.updateMany(
    { "languages": "French" }, 
    { "$set": { "languages.$": "Francais" } }
)

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