Postgresql - 在查询中将字段合并到 JSON object

Question

大家好，我有以下查询，其中包含一个子查询：

SELECT g.id, g.name, data.permissions, gp.has_permission
FROM groups g
RIGHT JOIN groups_permissions gp ON gp.group_id = g.id
RIGHT JOIN (SELECT p.id, array_to_json(array_agg(to_json(p.*)))
FROM permissions p
GROUP BY p.id) AS data (id, permissions) ON (gp.permission_id = data.id)
WHERE g.id=1

此查询返回以下结果：

[
  {
    "id": "7a588463-1780-459a-9646-8f19e9cb6ded",
    "name": "Administradores",
    "permissions": [
      {
        "id": "bf9d5ee3-d554-4faa-9cf4-9c60acb79801",
        "name": "Criar Grupos",
        "slug": "criar-grupos",
        "created_at": "2020-12-07T00:50:05.017783",
        "updated_at": "2020-12-07T00:50:05.017783"
      }
    ],
    "has_permission": true
  }
]

我想在权限数组中的 object 中有 has_permission 字段。

有人可以帮助将该字段与 object 合并吗？

现在谢谢你。

Answer 1

您不只需将 has_permission 添加到 json 子记录吗？

SELECT g.id, g.name, data.permissions
FROM groups g
RIGHT JOIN groups_permissions gp ON gp.group_id = g.id
RIGHT JOIN (SELECT p.id, array_to_json(array_agg(to_json(p.*, gp.has_permission)))
FROM permissions p
GROUP BY p.id) AS data (id, permissions) ON (gp.permission_id = data.id)
WHERE g.id=1