如何使用jq更新json文档中的单个值? [英] How do I update a single value in a json document using jq?

问题描述

如果我忽略了一些非常明显的内容，那么该应用程序；我刚刚找到了jq，并试图用它来更新一个JSON值而不影响周围的数据.

Appologies if I've overlooked something very obvious; I've just found jq and am trying to use it to update one JSON value without affecting the surrounding data.

我想将curl结果传送到jq，更新值，然后将更新的JSON传送到curl -X PUT.

I'd like to pipe a curl result into jq, update a value, and pipe the updated JSON to a curl -X PUT. Something like

curl http://example.com/shipping.json | jq '.' field: value | curl -X PUT http://example.com/shipping.json

到目前为止，我已经使用sed将其合并在一起，但是在查看jq中|=运算符的一些示例之后，我确定我不需要这些.

So far I've hacked it together using sed, but after looking at a few examples of the |= operator in jq I'm sure that I don't need these.

这是一个JSON示例-在保留其余JSON的同时，如何使用jq设置"local": false?

Here's a JSON sample--how would I use jq to set "local": false, while preserving the rest of the JSON?

{
  "shipping": {
    "local": true,
    "us": true,
    "us_rate": {
      "amount": "0.00",
      "currency": "USD",
      "symbol": "$"
    }
  }
}

推荐答案

您可以使用=运算符设置对象的值.另一方面，|=用于更新值.这是一个微妙但重要的区别.过滤器的上下文发生变化.

You set values of an object using the = operator. |= on the other hand is used to update a value. It's a subtle but important difference. The context of the filters changes.

由于将属性设置为恒定值，请使用=运算符.

Since you are setting a property to a constant value, use the = operator.

.shipping.local = false

请注意，在为属性设置值时，它不一定必须存在.您可以通过这种方式轻松添加新值.

Just note that when setting a value to a property, it doesn't necessarily have to exist. You can add new values easily this way.

.shipping.local = false | .shipping.canada = false | .shipping.mexico = true

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