gistfile1.txt

namespace Ushahidi\Usecase\Tag;

use Ushahidi\Entity\Tag;
use Ushahidi\Tool\Validator;
use Ushahidi\Exception\ValidatorException;

class Update
{
    private $repo;
    private $valid;

    private $updated = []; 

    public function __construct(UpdateTagRepository $repo, Validator $valid)
    {   
        $this->repo  = $repo;
        $this->valid = $valid;
    }   

    public function interact(Tag $tag, TagData $input)
    {   
        if($input->role) 
        {   
            $role = $input->role; 
            $input->role = json_encode($role); 
        }   
        // We only want to work with values that have been changed
            
        $update = $input->getDifferent($tag->asArray());

        if (!$this->valid->check($update))
            throw new ValidatorException("Failed to validate tag", $this->valid->errors());

        // Determine what changes to make in the tag
        $this->updated = $update->asArray();

        $this->repo->updateTag($tag->id, $this->updated);

        // Reflect the changes in the tag
        $tag->setData($this->updated);

        return $tag;
    }   

    public function getUpdated()
    {   
        return $this->updated;
    }   
}