How to select everything in column with Doctrine and Symfony - php

Question

I'm trying to build small query with QueryBuilder where category parameter that can be passed to query or not.
$category = 'Boots';
If not I'd like to select all categories.
I use "where" for this. In mySql you can use "WHERE column = column" and everything is selected. I tried this with the builder but it doesn't work:
$qb = $this->createQueryBuilder('p')
->select("p.id, p.price, stock.qty, p.images, category.name,
p.model, s.size AS size, c.name AS color,
b.name AS brand, category.name AS catName")
->innerJoin('p.stocks', 'stock')
->innerJoin('p.brand', 'b')
->innerJoin('stock.size','s')
->innerJoin('stock.color', 'c')
->innerJoin('p.category', 'category')
->where('category.name = :category')
->andWhere('s.size IN (:sizes)')
->andWhere('b.name IN (:brands)')
->andWhere('p.price > :priceFrom')
->andWhere('p.price < :priceTo')
->setParameter('category', 'category.name') /// ??? the problem is here
->setParameter('sizes', $sizes, \Doctrine\DBAL\Connection::PARAM_STR_ARRAY)
->setParameter('brands', $brands, \Doctrine\DBAL\Connection::PARAM_STR_ARRAY)
->setParameter('priceFrom', $priceFrom)
->setParameter('priceTo', $priceTo)
->groupBy('p.model')
->getQuery()
->getResult();
Check the lines:
->where('category.name = :category')
->setParameter('category', 'category.name') /// ??? the problem is here
When i try to set column to column it doesn't work. I tried also diferrent combinations like, but no results. Any advice? Thanks