Laravel. How to get a record, that has all user ids in related table? - mysql

Question

There is a chat table and intermediate table.
I need to get from the chat table only those chats for which all user identifiers are found.
Now I am getting records if at least one match is found
My query
$chat = $this->select('chats.*')->distinct()
->rightJoin("chat_user", function ($query) {
$query->on("chats.id", "=", "chat_user.chat_id")
->whereIn("chat_user.user_id", [2, 17]);
})
->where('chats.type', '=', 'single')
->get();
Result
But I need a chat width id 4, because only it matches my request
I also tried to do it like this
$chat = $this->select('chats.*')->distinct()
->rightJoin("chat_user", function ($query) use ($members_ids) {
$query->on("chats.id", "=", "chat_user.chat_id")
->where("chat_user.user_id", 2)
->where("chat_user.user_id", 17);
})
->where('chats.type', '=', 'single')->get();
But result is empty

Answer 1

In plain SQL, this could be achieved with the following query:
SELECT chats.*
FROM chats
WHERE chats.type = 'single'
AND EXISTS (SELECT 1 FROM chat_user WHERE user_id = 2 AND chat_id = chats.id)
AND EXISTS (SELECT 1 FROM chat_user WHERE user_id = 7 AND chat_id = chats.id)
Translated into a Laravel query, we get the following:
$userIds = [2, 7];
$chats = DB::table('chats')
->where('chats.type', 'single')
->where(function (Builder $query) use ($userIds) {
foreach ($userIds as $userId) {
$query->whereExists(fn (Builder $query) => $query
->select(DB::raw(1))
->from('chat_user')
->where('chat_user.user_id', $userId)
->whereColumn('chat_user.chat_id', 'chats.id'));
}
})
->select('chats.*')
->get();

Answer 2

You should do something like this instead:
$chat = $this->select('chats.*')->distinct()
->rightJoin('chat_user', function ($query) {
$query->on('chats.id', '=', 'chat_user.chat_id')
->where('chat_user.user_id', 2)
->where('chat_user.user_id', 17);
})
->where('chats.type', '=', 'single')
->get();
Specifying multiple where works as an AND condition. If you use whereIn() will work as an OR conditions for the supplied values.