Gravityforms limit submission – once for user, unlimited for guest

	public function context() {

		// rule targets specific user, if this user is different we don't need to test the rule
		if ( $this->user_id != 'all' ) {
			if ( $this->user_id != get_current_user_id() ) {
				return false;
			}
			
		}
		if($this->user_id == "all")
		{
		    if(get_current_user_id()===0)
			{
			    return false;
			}
		}

		return true;
	}