Laravel JOIN with JSON string - laravel

Question

I have two tables in Laravel, one is the comment table, and the second is the users table. In the comment table, I have this type of data.
For this comment table, I want to match the tags column's userid in JSON, so how can we join that userid with the user's table? here is what I tried, but that is not working as expected.
$messages = TopicComment::where('user_id', $currentUserId)
->join("users", "users.id", "=", "users.id")
->(function ($query) {
$query->whereJsonContains('tags.userid', users.id);
})
->
->get()->toArray();

Answer 1

with this package you can create a relation via a json field
https://github.com/staudenmeir/eloquent-json-relations

Answer 2

First, there seem to be a number of errors in your code.
Judging from the DB schema, there is no user_id column in your comments table and so, ::where('user_id', $currentUserId) will not work.
A similar issue occurs in your join statement. You're joining on "users.id","=","users.id" which is the same column in the same table.
There's no method called in the line with function($query). Ideally, should be a where clause.
Correct usage of whereJsonContains would be:
$query->whereJsonContains('tags', ['userid' => $currentUserId]);
Rouge arrow after that line.
And so, your final result after correcting the changes should look like:
use Illuminate\Support\Facades\DB;
...
$messages = TopicComment::join('users', 'users.id', DB::Raw("CAST(comments.tags->'$.userid' AS UNSIGNED)"))
->where(function ($query) use ($currentUserId) {
$query->whereJsonContains('tags', ['userid' => $currentUserId]);
})
->get()
->toArray();

Answer 3

I think the only way to extract is to use json tables.
DB::select(DB::raw("
SELECT document_types.*, jst.name
FROM document_types,
JSON_TABLE(settings, '$[*]' COLUMNS (
`userid` int(11) PATH '$.userid',
`name` varchar(255) PATH '$.name'
)) jst
inner join users on jst.userid = users.id WHERE users.id = :id"
,['id' => $currentUserId]))->get()
credit: https://dba.stackexchange.com/questions/306938/extract-json-object-inside-of-an-json-array-then-search-base-on-id
Unfortunately I don't have json functions on my mysql so the code will probably fail, maybe at least it'll help get you on the right track.

Answer 4

You can try this way...
eg:
<?php
$comments = DB::table('topic_comments')
->join('users', 'users.id', '=', 'topic_comments.tags->userid')
->select('topic_comments.*', 'users.name')
->get();