private void AddUserFavoriteMovie( User user, Movie favoriteMovie, MongoCollection<User> userCollection )
{
var movieShort = new MovieShortDetail( favoriteMovie );
var movieShortBson = movieShort.ToBsonDocument();
// Add permanently to model without saving
user.FavoriteMovies.Add( movieShort );
// Add atomically to database
userCollection.Update( Query.EQ( IdFieldName, user.Id ),
Update.AddToSet( FavoriteMoviesFieldName, movieShortBson ) );
// Update favorite movie collections for user's friends
var friendIds = user.Friends.Select( f => f.UserId ).ToArray();
var friends = userCollection.AsQueryable().Where( u => friendIds.Contains( u.Id ) );
foreach (var friend in friends)
{
userCollection.Update( Query.EQ( IdFieldName, friend.Id ),
Update.AddToSet( FriendsFavoriteMoviesFieldName, movieShortBson ) );
}
}
private void MakeFriends( User first, User second, MongoCollection userCollection )
{
var firstFriend = new Friend( first );
var secondFriend = new Friend( second );
// Add permanently to model without saving
first.Friends.Add( secondFriend );
second.Friends.Add( firstFriend );
// Add atomically to database
userCollection.Update( Query.EQ( IdFieldName, first.Id ),
Update.AddToSet( FriendsFieldName,
secondFriend.ToBsonDocument() ) );
userCollection.Update( Query.EQ( IdFieldName, second.Id ),
Update.AddToSet( FriendsFieldName,
firstFriend.ToBsonDocument() ) );
// Update favorite movie collections for two users
userCollection.Update( Query.EQ( IdFieldName, first.Id ),
Update.AddToSetEachWrapped(
FriendsFavoriteMoviesFieldName,
(IEnumerable<MovieShortDetail>)second.FavoriteMovies ) ); /* We need this explicit type cast because driver
* wrong interpret ICollection and added whole
* collection as one element. */
userCollection.Update( Query.EQ( IdFieldName, second.Id ),
Update.AddToSetEachWrapped(
FriendsFavoriteMoviesFieldName,
(IEnumerable<MovieShortDetail>)first.FavoriteMovies ) );
}
public IEnumerable<MovieShortDetail> GetFriendsFavotiteMovies( User user )
{
var userCollection = _dataBase.GetCollection( UserCollectionName );
var friendIds = user.Friends.Select( u => (BsonValue)u.UserId );
IMongoQuery selectQuery = Query.In( IdFieldName, friendIds );
var result = userCollection.Distinct( FavoriteMoviesFieldName, selectQuery )
.Select(doc => BsonSerializer.Deserialize<MovieShortDetail>((BsonDocument) doc));
return result;
}