Difference between getSize() and count() on collection

Question

I have heard many times that they both are the same. But I am facing a weird issue, in the product collection of CatalogSearch module, count() is returning correct product count while getSize() is returning zero.

So, basically this is what I am getting:

$collection->count(); //correct count
$collection->getSize(); //0

But I want the getSize() to have correct count as it decides whether to show pagination and products in the search page or not. I am using Inner Join, Left Join and Where condition only in the collection to be more specific.

Any ideas why I am getting this weird issue?

Thanks

UPDATE:

My previous question, How to clone the collection in Magento? I wanted to perform two different operations on one collection. The first collection shows correct getSize(), but then if the getSize() is zero, I removed the WHERE clause and gave new WHERE condition. After this, I am getting correct raw SQL what I expected, and running it in MySQL also gives a correct set of records, but only getSize() on the collection is giving zero counts.

So basically I may need to reload the collection, as getSize() is taking old count. Makes sense?

Marius · Accepted Answer · 2015-08-10T11:04:33.323

96

Most (if not all) the collections extend Varien_Data_Collection_Db. Here are the 2 methods from this class

public function getSize()
{
    if (is_null($this->_totalRecords)) {
        $sql = $this->getSelectCountSql();
        $this->_totalRecords = $this->getConnection()->fetchOne($sql, $this->_bindParams);
    }
    return intval($this->_totalRecords);
} 

public function count() //inherited from Varien_Data_Collection
{
    $this->load();
    return count($this->_items);
}

There is a difference. For getSize() the collection is not loaded. For count() it is. Usually collection models use the same getSize() method as above and only override getSelectCountSql().
In getSelectCountSql() the limit is reset in order to get the total number of records available for the set filters (where statement). See how the getSelectCountSql() works

public function getSelectCountSql()
{
    $this->_renderFilters();
    $countSelect = clone $this->getSelect();
    $countSelect->reset(Zend_Db_Select::ORDER);
    $countSelect->reset(Zend_Db_Select::LIMIT_COUNT);
    $countSelect->reset(Zend_Db_Select::LIMIT_OFFSET);
    $countSelect->reset(Zend_Db_Select::COLUMNS);
    $countSelect->columns('COUNT(*)');
    return $countSelect;
}

edited Aug 10 '15 at 11:04

answered May 23 '13 at 11:56

Marius

197,939
53
422
830

3

Great! So what should be my next step to reload the collection so that it can get correct getSize()? Thanks! – MagExt May 23 '13 at 12:04
I honestly don't know why do you get this result. In the CatalogSearch module there is nothing that overrides getSize() or getSelectCountSql(). It should work by default, unless you added some custom code. Can you post the way you build the collection? – Marius May 23 '13 at 12:08
updated the question. – MagExt May 23 '13 at 12:14
3

There is no way to reset _totalRecords. You can try to clone the collection before calling getSize() on the original collection. Maybe that will work. – Marius May 23 '13 at 12:19
you can also do something like this to get a "reset" count: $sql = $collection->getSelectCountSql(); return $collection->getConnection()->fetchOne($sql); – koosa Nov 18 '16 at 00:43

score 14 · Answer 2 · edited Jun 15 '20 at 08:30

14

Be careful. This is correct, but the methods are overwritten in `Varien_Data_Collection_Db` as described by Marius

Just have a look into

// \Varien_Data_Collection::getSize
public function getSize()
{
    $this->load();
    if (is_null($this->_totalRecords)) {
        $this->_totalRecords = count($this->getItems());
    }
    return intval($this->_totalRecords);
}
// \Varien_Data_Collection::count
public function count()
{
    $this->load();
    return count($this->_items);
}

So it should on this low level be the same. Both methods load the collection and count the items.

UPDATE

Oh I see a problem: getSize() caches the _totalRecords, this means it is not recalculated. Check where _totalRecords is set?

edited Jun 15 '20 at 08:30

Community

1

answered May 23 '13 at 11:49

Fabian Blechschmidt

35,388
8
75
182

Yes I have looked at it, but can't figure it out why both are generating different counts for the same collection? Any ideas how to reload collection or something to get correct count in getSize()? – MagExt May 23 '13 at 11:52
updated the entry – Fabian Blechschmidt May 23 '13 at 11:54
1

getSize() does not load the collection for records that come from the data base. Not unless you override the method and tell it to load the collection. – Marius May 23 '13 at 11:58
_totalRecords is protected so can't call it in my custom file with collection. echo count($collection->load()->getItems()); gives correct count, but again I want getSize() to work. – MagExt May 23 '13 at 12:02

changeling · Answer 3 · 2015-09-10T20:06:45.690

This answer shows up in google for "magento getSize wrong" and similar searches so I would like to add a possible scenario that might be useful to someone

When you have a group statement in your query and you do a

SELECT COUNT(DISTINCT e.entity_id) ... GROUP BY ( at_id_art.value )

Mysql will return a count for EACH of the groups, so Varien_Data_Collection_Db::getSize() will return the wrong answer, this is because this function fetches the first row:

public function getSize()
{
    if (is_null($this->_totalRecords)) {
        $sql = $this->getSelectCountSql();
        $this->_totalRecords = $this->getConnection()->fetchOne($sql, $this->_bindParams);
    }
    return intval($this->_totalRecords);
}

When it populates

$this->_totalRecords = $this->getConnection()->fetchOne($sql, $this->_bindParams);

It selects the first row and therefore returns the total of the first group as the total size.

I ended up coming up with this code to count, based on the unique values of the attributes in my query.

$select = clone $collection->getSelect();
$group = $select->getPart(Zend_Db_Select::GROUP);
$select->reset(Zend_Db_Select::GROUP)->reset(Zend_Db_Select::COLUMNS)->columns("COUNT(DISTINCT {$group[0]})");
$totalCount = $collection->getConnection()->fetchOne($select);

score 2 · Answer 4 · edited Mar 21 '16 at 00:37

2

Just in case you end up here, there is another simple fix to try:

System -> Index Management

and select them all (even if they are indicating "Green, no re-index needed" and force them to reindex.

This solved my empty getSize() problem, which in turn, allowed the Special and New database requests to find the products, fulfill the "if" conditions and properly render.

edited Mar 21 '16 at 00:37

Adarsh Khatri

8,360
2
25
58

answered Mar 20 '16 at 23:05

BVRoc

21
2

score 0 · Answer 5 · answered Jun 10 '19 at 20:07

0

When count($collection) was different than $collection->getSize() I had to reindex the products, then everything worked fine.

answered Jun 10 '19 at 20:07

Zsolti

746
7
7

score -1 · Answer 6 · answered Aug 28 '18 at 09:45

-1

There is a main difference For getSize() the product collection is not loaded. For count() it will load whole product collection. So for big catalog it is not advisable to use count function in any collection.

answered Aug 28 '18 at 09:45

Rik Patel

484
2
11

Already said in Marius post ... – sv3n May 10 '19 at 23:47

Difference between getSize() and count() on collection

6 Answers6

Be careful. This is correct, but the methods are overwritten in `Varien_Data_Collection_Db` as described by Marius

Linked

Related

Difference between getSize() and count() on collection

6 Answers6

Be careful. This is correct, but the methods are overwritten in Varien_Data_Collection_Db as described by Marius

Linked

Related

Be careful. This is correct, but the methods are overwritten in `Varien_Data_Collection_Db` as described by Marius