public function hasResponsible($user)
    {
        return $this->users()->where('user_id', $user->id)->first()->pivot->responsible;
    }
public function hasResponsible($user)
    {
        return $this->users()->where('user_id', $user->id)->first()->pivot->responsible;
    }
public function hasResponsible ( $ user ) { return $ this -> users ( ) -> where ( 'user_id' , $ user -> id ) -> first ( ) -> pivot -> responsible ; }
Returns true if the event have the specified user as responsible.

@param mixed $user
Returns true if the event have the specified user as responsible .