Edit on GitHub

Triggered in: Winter\Storm\Database\Relations\BelongsToMany.php

Called before creating a new relation between models (only for BelongsToMany relation)

Example usage:

$model->bindEvent('model.relation.beforeAttach', function (string $relationName, array $attachedIdList, array $insertData) use (\Winter\Storm\Database\Model $model) {
    if (!$model->isRelationValid($attachedIdList)) {
        throw new \Exception("Invalid relation!");
        return false;

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