Rails Postgres-Jsonb列查询 [英] Rails Postgres - Jsonb Column Query

问题描述

我有一个名为 available_quantity的带有jsonb列的Bundle表格。将具有样本值

I have a Bundle tabel with jsonb column named 'available_quantity'. which will have sample values

[{面额： 100，数量： 20}，{面额： 1000，数量： 19}]

[{ "denomination": "100", "quantity": "20"}, { "denomination": "1000", "quantity": "19"}]

现在，我要查询数量少于50的所有记录。

Now, I want to query all records with quantity less than 50.

我尝试了此查询，

Bundle.where（（available_quantity->>'quantity'）:: numeric< 50）

Bundle.where("(available_quantity->>'quantity')::numeric < 50")

但是此返回空关系。

我该怎么办？

                                            Table "offer_service.bundles"
    Column         |            Type             | Collation | 
Nullable |                        Default                         
-----------------------+-----------------------------+-----------+---- 
------+--------------------------------------------------------
id                    | bigint                      |           | not 
null | nextval('offer_service.bundles_id_seq'::regclass)
project_id            | bigint                      |           |          
| 
 item_type             | character varying           |           |          
| 
item_id               | bigint                      |           |          
| 
status                | integer                     |           | not 
 null | 0
 created_at            | timestamp without time zone |           | not 
null | 
 updated_at            | timestamp without time zone |           | not 
null | 
denomination_quantity | jsonb                       |           |          
| 
 deleted_at            | timestamp without time zone |           |          
| 
 available_quantity    | jsonb                       |           |          
| 

示例数据：

id: 2586, project_id: 3, item_type: "GiftCard", item_id: 659, status: 
"activated", created_at: "2020-05-18 09:38:54", updated_at: "2020-05- 
28 13:25:29", denomination_quantity: {"100"=>200, "1000"=>200}, 
deleted_at: nil, available_quantity: [{"quantity"=>16, 
"denomination"=>"100"}, {"quantity"=>20, "denomination"=>1000}]

推荐答案

希望我们在这里使用子查询。

Hope we have to use sub query here.

 Bundle.select("*").from(Bundle.select("*, jsonb_array_elements(available_quantity) as aq")).where("(aq ->> 'quantity')::numeric <= 50").distinct

欢迎重构上述查询的建议！

Suggestions on refactoring the above query is welcomed!

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