private async Task RemoveLikeRecord(UserId userId, PhotoId photoId)
{
logWriter.LogInformation($"{nameof(RemoveLikeRecord)}({nameof(userId)} = '{userId}', {nameof(photoId)} = '{photoId}')");
var photo = await photoRepository.GetPhotoById(photoId, Guid.Empty);
var newLikeCount = photo.LikeCount - 1;
var deleteItemRequest = new DeleteItemRequest(
tableName,
Mappers.PhotoLike.ToDbKey(new PhotoLikeRecord
{
UserId = userId,
PhotoId = photoId,
CreatedTime = system.Time.UtcNow
}));
try
{
await dynamoDbCore.DeleteItem(deleteItemRequest);
await UpdateLikeCount(photo, newLikeCount);
}
catch (Exception ex)
{
logWriter.LogError(ex, $"Error in {nameof(RemoveLikeRecord)}({nameof(userId)} = '{userId}', {nameof(photoId)} = '{photoId}'):\n{ex.ToString()}");
throw;
}
}
public async Task DeletePhotoComment(PhotoComment comment)
{
var photo = await photoRepository.GetPhotoById(comment.PhotoId, Guid.Empty);
var deleteCommentRequest = new DeleteItemRequest
{
TableName = tableName,
Key = Mappers.PhotoComment.ToDbKey(comment)
};
try
{
await dynamoDbCore.DeleteItem(deleteCommentRequest);
await UpdateCommentCount(photo, photo.CommentCount - 1);
}
catch (Exception ex)
{
logWriter.LogError(ex, $"Error in {nameof(DeletePhotoComment)}():\n{ex.ToString()}");
throw;
}
}
private async Task RemoveLikeRecord(UserId userId, PhotoId photoId)
{
BatchGetItemRequest request = new BatchGetItemRequest
{
RequestItems = new Dictionary <string, KeysAndAttributes>
{
{ tableName, new KeysAndAttributes {
Keys = new[] {
Mappers.PhotoModel.ToDbKey(new PhotoModel {
PhotoId = photoId
}),
Mappers.PhotoLike.ToDbKey(new PhotoLikeRecord {
PhotoId = photoId, UserId = userId
})
}.ToList()
} }
}
};
var items = await dynamoDbCore.BatchGetItem(request);
PhotoModel photo = null;
PhotoLikeRecord likeRecord = null;
foreach (var item in items[tableName])
{
switch (item[FieldMappings.RecordType].S.ToLower())
{
case "photo":
photo = Mappers.PhotoModel.FromDbItem(item);
break;
case "photolike":
likeRecord = Mappers.PhotoLike.FromDbItem(item);
break;
}
}
if (likeRecord == null)
{
return;
}
logWriter.LogInformation($"{nameof(RemoveLikeRecord)}({nameof(userId)} = '{userId}', {nameof(photoId)} = '{photoId}')");
var scoreDelta = scoreCalculator.GetLikeScore(likeRecord) * -1;
var deleteItemRequest = new DeleteItemRequest(
tableName,
Mappers.PhotoLike.ToDbKey(new PhotoLikeRecord
{
UserId = userId,
PhotoId = photoId,
CreatedTime = system.Time.UtcNow
}));
try
{
await dynamoDbCore.DeleteItem(deleteItemRequest);
await UpdateLikeCountAndScore(photo, -1, scoreDelta);
}
catch (Exception ex)
{
logWriter.LogError(ex, $"Error in {nameof(RemoveLikeRecord)}({nameof(userId)} = '{userId}', {nameof(photoId)} = '{photoId}'):\n{ex.ToString()}");
throw;
}
}