postgresql - 在 JSONB 数组中插入元素 - Postgresql

Question

假设我有一张 table :

SELECT * FROM settings;
| id | name    | strategies |
| -- | ---     | ---        |
| 1  | default | [{name: xyz, enabled: true}, {name: bot2, enabled: true}]  |
| 2  | new1    | [{name: bot2, enabled: true}, {name: xyz, enabled: false}] |

我想在 bot2 之前添加一个新对象 {name: bot1, enabled: true}。

我正在尝试使用来自 this answered question 的解决方案:

WITH bot2_index AS (SELECT
    pos- 1 AS bot2_index
FROM
    settings, 
    jsonb_array_elements(strategies) WITH ordinality arr(elem, pos)
WHERE
    NAME = 'default'
    AND elem->>'name' = 'bot2')    
UPDATE settings
SET strategies = jsonb_set(strategies, '{bot2_index}', '{
  "name": "bot1",
  "enabled": false
}', TRUE);

但是我明白了

ERROR:  path element at position 1 is not an integer: "bot2_index"

bot2_index 是 bigint 类型那么为什么这个语法不起作用？

我还尝试了其他变体，例如 bot2_index、bot2_index::int、bot2_index::string，甚至可以将其运行为两个单独的查询(就像在接受的答案中一样)但它也不起作用。

编辑#1

此语法有效，但它似乎替换了该索引处的元素，而不是在给定索引处的元素之前或之后附加元素 - 我怎样才能让它像 JS splice()功能？

UPDATE settings
SET strategies = jsonb_set(strategies, concat('{',(SELECT
    pos- 1 AS bot2_index
FROM
    settings, 
    jsonb_array_elements(strategies) WITH ordinality arr(elem, pos)
WHERE
    NAME = 'default'
    AND elem->>'name' = 'js:bot2'),'}')::text[], '{
  "name": "bot1",
  "enabled": false
}', TRUE);

Answer 1

首先，对于您当前的查询，您应该像下面这样使用它:

WITH bot2_index AS (SELECT
    pos- 1 AS bot2_index
FROM
    settings, 
    jsonb_array_elements(strategies) WITH ordinality arr(elem, pos)
WHERE
    name = 'default'
    AND elem->>'name' = 'bot2')    
        
UPDATE settings
SET strategies = jsonb_set(strategies, array[bot2_index::text], '{
  "name": "bot1",
  "enabled": false
}'::jsonb, false) from bot2_index;

但查询将替换现有的 DEMO

你应该使用 jsonb_insert 而不是 jsonb_set。

WITH bot2_index AS (SELECT
    pos- 1 AS bot2_index
FROM
    settings, 
    jsonb_array_elements(strategies) WITH ordinality arr(elem, pos)
WHERE
    name = 'default'
    AND elem->>'name' = 'bot2')    
        
UPDATE settings
SET strategies = jsonb_insert(strategies, array[bot2_index::text], '{
  "name": "bot1",
  "enabled": false
}'::jsonb, false) from bot2_index;
  

DEMO