大廈的ActiveRecord/SQL查詢

Question

目前，對於使用不同的參數重複搜索，我有這樣的ActiveRecord查詢生成：

current_user.documents.order(:updated_at).reverse_order.includes(:groups,:rules) 

現在，平時我釘在一個where子句來此執行此搜索。但是，我現在需要通過jsonb字段搜索所有具有特定值值的行，如鍵值對中一樣。我已經能夠做一個類似的東西在我的SQL，這種語法（數據字段只會正好有兩個級別的嵌套）：

SELECT 
    * 
FROM 
    (SELECT 
     * 
    FROM 
     (SELECT 
      * 
     FROM 
      documents 
     ) A, 
     jsonb_each(A.data) 
    ) B, 
    jsonb_each_text(B.value) ASC C 
WHERE 
    C.value = '30'; 

不過，我想利用當前的ActiveRecord搜索使這個查詢（其中包括組/規則急切加載）。

我與使用逗號，我的理解是一個隱含的加盟，這是明確連接之前執行的掙扎，所以當我嘗試這樣：

select * from documents B join (select * from jsonb_each(B.data)) as A on true; 
ERROR: invalid reference to FROM-clause entry for table "b" 
LINE 1: ...* from documents B join (select * from jsonb_each(B.data)) a... 
                 ^
HINT: There is an entry for table "b", but it cannot be referenced from this part of the query. 

但我不不瞭解如何引用完成的「表」，即在創建聯接調用之前創建的ActiveRecord查詢，以及使用隱式聯接的逗號語法來工作。

另外，我是一個SQL業餘愛好者，所以如果你看到一些改進或其他方式來做到這一點，請告訴。

編輯：文件表的說明：

             Table "public.documents" 
Column  |   Type    |      Modifiers      | Storage | Stats target | Description 
------------+-----------------------------+--------------------------------------------------------+----------+--------------+------------- 
id   | integer      | not null default nextval('documents_id_seq'::regclass) | plain |    | 
document_id | character varying   |              | extended |    | 
name  | character varying   |              | extended |    | 
size  | integer      |              | plain |    | 
last_updated| timestamp without time zone |              | plain |    | 
user_id  | integer      |              | plain |    | 
created_at | timestamp without time zone |              | plain |    | 
updated_at | timestamp without time zone |              | plain |    | 
kind  | character varying   |              | extended |    | 
uid   | character varying   |              | extended |    | 
access_token_id | integer      |              | plain |    | 
data  | jsonb      | not null default '{}'::jsonb       | extended |    | 

指標： 「documents_pkey」 主鍵，B樹（ID） ```

樣品行，首先將匹配搜索'30'（數據是最後一個字段）：

2104 | 24419693037           | LsitHandsBackwards.jpg     |  |       |  1 | 2017-06-25 21:45:49.121686 | 2017-07-01 21:32:37.624184 | box   | 221607127   |    15 | {"owner": {"born": "to make history", "price": 30}} 
2177 | /all-drive/uml flows/typicaluseractivity.svg   | TypicalUserActivity.svg     | 12375 | 2014-08-11 02:21:14  |  1 | 2017-07-07 14:00:11.487455 | 2017-07-07 14:00:11.487455 | dropbox  | 325694961   |    20 | {"owner": {}} 

Answer 1

您可以使用一個類似於你已經顯示的查詢：

SELECT 
    d.id, d.data 
FROM 
    documents AS d 
    INNER JOIN json_each(d.data) AS x ON TRUE 
    INNER JOIN json_each(x.value) AS y ON TRUE 
WHERE 
    cast(y.value as text) = '30'; 

假設你的數據將是下列操作之一：

INSERT INTO documents 
    (data) 
VALUES 
    ('{"owner": {"born": "to make history", "price": 30}}'), 
    ('{"owner": {}}'), 
    ('{"owner": {"born": "to make history", "price": 50}, "seller": {"worth": 30}}') 
; 

你會得到的結果是：

 
id | data                   
-: | :--------------------------------------------------------------------------- 
1 | {"owner": {"born": "to make history", "price": 30}}       
3 | {"owner": {"born": "to make history", "price": 50}, "seller": {"worth": 30}} 

你可以在查看它（連同一些一步一步看的數據）dbfiddle here