private BatchWriteItemRequest GetHashtagsWriteRequests(
IEnumerable <HashtagModel> hashtags,
PhotoModel existingItem,
IEnumerable <HashtagModel> hashtagsBefore,
HashtagUpdateMode updateMode)
{
var hashtagsToRemove = updateMode == HashtagUpdateMode.Update
? GetHashTagsToRemove(hashtagsBefore, hashtags)
: emptyHashtagSequence;
var hashtagsToAdd = GetHashTagsToAdd(hashtagsBefore, hashtags).Select(x => new HashtagPhoto {
Hashtag = x, Photo = existingItem
});
logWriter.LogInformation($"Existing hashtags:\n{JsonConvert.SerializeObject(existingItem?.Hashtags.ToArray() ?? emptyHashtagSequence)}\nIncoming hashtags:\n{JsonConvert.SerializeObject(hashtags.ToArray())}\nHashtags to add:\n{JsonConvert.SerializeObject(hashtagsToAdd.ToArray())}\nHashtags to delete:\n{JsonConvert.SerializeObject(hashtagsToRemove.ToArray())}");
var hashTagRemoveRequests = hashtagsToRemove.Select(x => new WriteRequest
{
DeleteRequest = new DeleteRequest
{
Key = Mappers.Hashtag.ToDbKey(x),
}
});
var hashTagAddRequests = hashtagsToAdd.Select(x => new WriteRequest
{
PutRequest = new PutRequest
{
Item = Mappers.HashtagPhoto.ToDbItem(x)
}
});
var writeRequests = hashTagRemoveRequests.Union(hashTagAddRequests);
return(writeRequests.Any()
? new BatchWriteItemRequest {
RequestItems = new Dictionary <string, List <WriteRequest> > {
{ tableName, writeRequests.ToList() }
}
}
: null);
}
private BatchWriteItemRequest GetHashtagsRequests(string text, IEnumerable <HashtagModel> hashtags, PhotoModel existingItem, HashtagUpdateMode updateMode)
{
IEnumerable <HashtagModel> hashtagsBefore = updateMode == HashtagUpdateMode.Update
? existingItem.Hashtags
: emptyHashtagSequence;
existingItem.RawText = text;
existingItem.Hashtags = hashtags;
BatchWriteItemRequest writeItemsRequest = GetHashtagsWriteRequests(hashtags, existingItem, hashtagsBefore, updateMode);
return(writeItemsRequest);
}
