Laravel using eloquent Count with Having - php

Question

I have two variables $customers (that holds all the rows) and $total that holds the total rows of the query.
I usually do the following query:
$customers = Customers::select
(
'customer.id',
'customer.name',
'customer.min_tolerance',
DB::raw('(SELECT MAX(tolerance) FROM customers_tolerances WHERE customer_id = customer.id) AS tolerance')
)
->from('customers AS customer')
->whereIn('customer.id', $request->customers);
$total = $customers->count();
$customers = $customers->limit($request->limit)
->offset($request->offset)
->get();
This works great. I get all the rows limited (usually 20 per page) plus the total rows.
My problem is that I added a having clause to my query, so it looks like this now:
$customers = Customers::select
(
'customer.id',
'customer.name',
'customer.min_tolerance',
DB::raw('(SELECT MAX(tolerance) FROM customers_tolerances WHERE customer_id = customer.id) AS tolerance')
)
->from('customers AS customer')
->whereIn('customer.id', $request->customers)
->havingRaw('tolerance >= customer.min_tolerance');
And the $count stopped working as it triggers an error:
Column not found: 1054 Unknown column 'tolerance' in 'having clause'
select count(*) as aggregate from customers as customer having tolerance >= customer.min_tolerance)
So how can I use count with having clause?

Answer 1

Solved.
Before creating this post I tried to create a subquery, as follow:
SELECT COUNT(*) FROM (SELECT ...)
But the slowness of the query was too much, so I tried to look for answers here. The slowness was due to the lack of index in tables.
By adding ALTER TABLE customers_tolerances ADD INDEX(customer_id); I'm now able to retrieve fast the total results.