在Rails中使用postgres json字段更新嵌套键

本文介绍了在Rails中使用postgres json字段更新嵌套键的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我一直在尝试更新以下内容:

I've been trying to update the following :

{"boxes": {"book": 2, "moving": 2}, "goods": {}}

至:

{"boxes": {"book_new": 2, "moving": 2}, "goods": {}}

，无需使用正则表达式或在ruby中执行此操作.但似乎有点棘手. 我想添加新密钥，然后删除旧密钥，我对语法不熟悉，在互联网上找不到很多密钥.

without using a regular expression or doing this in ruby. but it seems it's a bit tricky. I want to add new key and then delete the old one, I'm not familiar with the syntax and I couldn't find much on the internet.

我能够向数据中添加新元素，但不能向嵌套框中添加新元素！！ 像这样:

I was able to add a new element to the data but not to the nested boxes!! like that:

Update moves SET data = data::jsonb || '{"bookasas": 2}' WHERE data ->> 'boxes' LIKE '%book%';

感谢您的帮助.

推荐答案

没有替换json键的功能，因此您应该删除旧对象并添加新对象:

There is no function to replace json key, so you should delete the old object and add new one:

update moves set data = jsonb_set( data::jsonb, array['boxes'], (data->'boxes')::jsonb - 'book' || jsonb_build_object('book_new', data->'boxes'->'book') ) where data ->> 'boxes' like '%book%' returning *; data ------------------------------------------------------ {"boxes": {"moving": 2, "book_new": 2}, "goods": {}} (1 row)