playlists.sol

pragma solidity ^0.4.2;
contract Playlists {
    
    struct Playlist {
       address creator; 
       string title; 
       string description; 
       address[] contentList;
    }
   
    mapping (address => Playlist) playlists;
   
    event Create(address _creator, string _title, string _description, address[] _contentList, address _playlist);
    event Edit(address _creator, string _title, string _description, address _playlist);
    event Add(address _content, address _playlist);
    event Remove(address _content, address _playlist);

    function create(address _creator, string _title, string _description, address[] _contentList, address _playlist) public {
        playlists[_playlist] = Playlist({creator:_creator, title:_title, description:_description, contentList:_contentList});  
        emit Create (_creator, _title, _description, _contentList, _playlist);
    }
   
    function edit(address _creator, string _title, string _description, address _playlist) public {
        Playlist storage playlist = playlists[_playlist];
        playlist.creator = _creator;
        playlist.title = _title;
        playlist.description = _description;
        playlists[_playlist] = playlist;
        emit Edit(_creator, _title, _description, _playlist);
    }
    
    function add(address _content, address _playlist) public{
        Playlist storage playlist = playlists[_playlist];
        playlist.contentList.push(_content);
        playlists[_playlist] = playlist;
        emit Add(_content, _playlist);
    }
   
    function remove(address _content, address _playlist) public{
        Playlist storage playlist = playlists[_playlist];
        for (uint x = 0; x<playlist.contentList.length; x++) {
            if (playlist.contentList[x] == _content){
                for (uint i = x; i<playlist.contentList.length-1; i++){
                    playlist.contentList[i] = playlist.contentList[i+1]; 
                }
                playlist.contentList.length--;
            }
        }
        playlists[_playlist] = playlist;
        emit Remove(_content, _playlist);
    }
    
    function get (address _playlist) public constant returns (address, string, string, address[]){
        return (
            playlists[_playlist].creator, 
            playlists[_playlist].title, 
            playlists[_playlist].description, 
            playlists[_playlist].contentList
        );
    }
    
}