join a single table twice in join query - php

Question

I have 3 tables users and meeting table and user_role. In user table I have user_name and user_role fields
and in meeting table I have the column meeting_id assigned_username and created_by_user_name fields and In user_roles table have id and role .
users
user_name role
a 1
b 2
c 3
meeting table
meeting_id assigned_username created_by_user_name
m1 a b
m2 b -
m3 b a
user_roles
id user_role
1 role1
2 role2
3 role3
I want to get the assigned_user_name's user_role and created_by_user_name's user_role in single query. I have tried as
$user=DB::table('meeting')
->leftjoin('users','users.user_name','=','meeting_after_validation.assigned_user_name')
->leftjoin('users as ca','ca.user_name'),'=','meeting_after_validation.created_by_name')
->leftjoin('user_roles','users.user_role','=','user_roles.id')
->leftjoin('user_roles as carole','ca.user_role','=','carole.id')
->whereIn('carole.is',['1','2'])
->select('users.user_name','user_roles.role','carole.role')->toArray();
but getting
Call to a member function whereIn() on array
how to get role of assigned_user_name and created_by_user_name.

Answer 1

You must use get() before you can use toArray() if you want to get the values as an array.
Also, there may be a typo for your whereIn, should it be carole.id?
Here is what the query could look like in SQL:
SELECT
meeting.meeting_id,
users_assigned.user_name as assigned_user,
role_assigned.user_role as assigned_user_role,
users_created.user_name as created_user,
role_created.user_role as created_user_role
FROM meeting
LEFT JOIN users as users_assigned ON meeting.assigned_username = users_assigned.user_name
LEFT JOIN user_roles as role_assigned ON users_assigned.role = role_assigned.id
LEFT JOIN users as users_created ON meeting.created_by_user_name = users_created.user_name
LEFT JOIN user_roles as role_created ON users_created.role = user_roles.id
WHERE role_assigned.id IN (1, 2)
And in Laravel query builder:
$user = DB::table('meeting')
->select([
'meeting.meeting_id',
'users_assigned.user_name as assigned_user',
'role_assigned.user_role as assigned_user_role',
'users_created.user_name as created_user',
'role_created.user_role as created_user_role',
])
->leftJoin('users as users_assigned', 'meeting.assigned_username', '=', 'users_assigned.user_name')
->leftJoin('user_roles as role_assigned', 'users_assigned.role', '=', 'role_assigned.id')
->leftJoin('users as users_created', 'meeting.created_by_user_name', '=', 'users_created.user_name')
->leftJoin('user_roles as role_created', 'users_created.role', '=', 'user_roles.id')
->whereIn('role_assigned.id', [1, 2])
->get()
->toArray();