按值删除jsonb数组元素

我确实弄清楚如何从一个数组中删除单个记录的值,但是如何为其中许多记录删除它.问题在于我如何使用子查询.因为它必须只返回单个元素.也许我的方法是错的.

    Given input: '{attributes:['is_new','is_old']}'
    Expected result '{attributes: ['is_old']}' #remove 'is_new' from jsonb array

    Real example:
    #   sku  |           properties 
    # -------+--------------------------------
    #  nu3_1 | {                             +
    #        |     "name": "silly_hodgkin",+
    #        |     "type": "food",+
    #        |     "attributes": [           +
    #        |         "is_gluten_free",+
    #        |         "is_lactose_free",+
    #        |         "is_new"              +
    #        |     ]                         +
    #        | }  

#Query that removes single array element:

SELECT c.sku,jsonb_agg(el) FROM
catalog c JOIN (select sku,jsonb_array_elements_text(properties->'attributes') as el from catalog) c2 ON c.sku=c2.sku where el  'is_new'
GROUP BY c.sku;

#Update query that removes single array element in single record

UPDATE catalog SET properties=jsonb_set(properties,'{attributes}',(
    SELECT jsonb_agg(el) FROM
    catalog c JOIN (select sku,jsonb_array_elements_text(properties->'attributes') as el from catalog) c2 ON c.sku=c2.sku
    WHERE el  'is_new' AND c.sku='nu3_1'
    GROUP BY c.sku
    )
) WHERE sku='nu3_1';

问题是.如何为许多数据库记录的值删除jsonb数组元素？

解决方法

使用 jsonb_set() and the delete operator -：

update catalog
set properties = 
    jsonb_set(properties,(properties->'attributes') - 'is_new');

Test it in rextester.

原文地址：https://www.jb51.cc/js/150652.html