Using sum() sql with php ActiveRecord - php

Question

I'm using ActiveRecord in my app. I need to add many objects by attribute. Currently I do it as follows:
foreach($objects as $object):
$result += $object->value;
endforeach;
But it is very slow. I think I could get the same result but more efficient by sql sum(), so de question is can ActiveRecord return me the sum() result?

Answer 1

The only aggregating function already implemented in the model is count(). For sum(), you'd have to use an SQL query. You can do that using different classes (Connection, Table or Model).
Here's using find_by_sql() of the Model (returns an array of models):
$result = FooModel::find_by_sql('SELECT SUM(`value`) AS sum FROM `foo_table`')[0]->sum;

Answer 2

Add custom model to your lib/Model.php file
public static function sum($args) {
$args = func_get_args();
$options = static::extract_and_validate_options($args);
$options['select'] = 'SUM('.$args[0]["sum"].')';
if (!empty($args) && !is_null($args[0]) && !empty($args[0]))
{
if (is_hash($args[0]))
$options['conditions'] = (isset($args[0]["conditions"]) ? $args[0]["conditions"] : array());
else
$options['conditions'] = call_user_func_array('static::pk_conditions',$args);
}
$table = static::table();
$sql = $table->options_to_sql($options);
$values = $sql->get_where_values();
return static::connection()->query_and_fetch_one($sql->to_s(),$values);
}
Then call it:
YourModel::sum(array('conditions' => 'userid = 3', 'sum' => 'your_column'));
or
YourModel::sum(array('sum' => 'your_column'));