addFieldtofilter array not reading

Question

I am trying to filter product collection by ids if I use below code, the filter works ok and the product shows.

$this->_productCollection
            ->addFieldToFilter('entity_id',array('in'=> 460 ));

The problem is that if I set an array to this code and try to filter, I keep getting empty collection.

$getData = array(460);
$this->_productCollection
            ->addFieldToFilter('entity_id',array('in'=> $getData ));

I've already tried setting array like the following

$getData[$a]= array(460);

and reading like

array('in'=> $getData[$a] )

PS: My array is variable, not only one product I can't see anything wrong with the code and if dump array it is ok I think: array([0] => int(460))

Answer 1

Try this:

$getData= array(17,78);
$collection->addAttributeToFilter('entity_id',array('in'=> $getData ));

This is working for me.

Answer 2

You were doing the filter after category filter,so it may be that product is not in current category.That why your collection was returning Null. .

Better way to filter by product ids is

$productIDS =  array(460,4,98);
$collection->addIdFilter($productIDS);