Yii2 : validate if at least one checkbox is selected - yii2

Question

I have multiple Music releases for a user for which he wants to create a promo, on the promo create form we have all the releases listed and I am using a form model for creating the promo where I define all rules for my several inputs in the promo form model.
I want to check if at-least one release is selected by the user when saving the form but it is not working as the checkboxes are created dynamically.
my form code for that field
foreach ($releaseInfo as $releases) {
if (!is_null($releases->releaseSongs)) {
echo "<fieldset><legend>" . \yii\helpers\Html::activeCheckbox($model, 'selected_releases[]', ['id' => 'release_' . $releases->id, 'onclick' => '$("#songs_' . $releases->id . '").toggle()', 'label' => false]) . " " . $releases->name . "</legend>";
foreach ($releases->releaseSongs as $k => $v) {
echo "<div id='songs_" . $releases->id . "' style='display:none'>";
echo "<div>";
echo $v->song->name;
echo "</div>";
echo "</div>";
}
}
}
echo "</fieldset>";
my rule in model
['selected_releases', 'required', 'on' => ['catalog', 'catalog_update'], 'requiredValue' => 1,
'when' => function ($model) {return ($model->scenario == self::SCENARIO_CATALOG_BASED || $model->scenario == self::SCENARIO_CATALOG_BASED_UPDATE);},
'whenClient' => 'function(attribute,value){return ("' . $this->scenario . '"=="' . self::SCENARIO_CATALOG_BASED . '" || "' . $this->scenario . '"=="' . self::SCENARIO_CATALOG_BASED_UPDATE . '")}',
'message' => 'You must select atleast one release',
]
when i submit my form the posted input variable looks like this
[selected_releases] => Array(
[0] => 0
[1] => 0
)
the requiredValue in the rule does not work because the selected_releases is an array of values it always says that
You must select atleast one release
how shoule i use the requiredValue parameter option for rules in a way that it checks for atleast one slection of the checkbox
OR
do i have to make a custom validation method an call it when validating

Answer 1

i used custom validation method for this purpose , my validation rule looks like following
['selected_releases', 'checkreleaseSelection'
, 'on' => ['catalog', 'catalog_update'],
'when' => function ($model) {return ($model->scenario == self::SCENARIO_CATALOG_BASED || $model->scenario == self::SCENARIO_CATALOG_BASED_UPDATE);},
'whenClient' => 'function(attribute,value){return ("' . $this->scenario . '"=="' . self::SCENARIO_CATALOG_BASED . '" || "' . $this->scenario . '"=="' . self::SCENARIO_CATALOG_BASED_UPDATE . '")}',
]
Custom method
public function checkreleaseSelection()
{
$error = true;
foreach ($this->selected_releases as $selection) {
if ($selection) {
$error = false;
}
}
if ($error) {
$this->addError('selected_releases', 'You must select atleast one of your releases to continue');
}
};