/// <summary>
/// 赞或者取消赞
/// </summary>
/// <param name="personId">PersonID</param>
/// <param name="entityId">EntityID</param>
/// <param name="entityTable">EntityTable</param>
/// <returns></returns>
public async Task<Tuple<bool, int>> LikeAsync(long personId, long entityId, Type entityTable)
{
bool isLike = false;
//1. 获取EntityConcurruentLock对象，用于处理Concurrent。
EntityConcurrentLockHandler entityConcurrentLockHandler = new EntityConcurrentLockHandler(_dbContext);
var entityLikeLockObj = await entityConcurrentLockHandler.GetByIdAsync(personId);
if(entityLikeLockObj == null)
{
EntityConcurrentLock entityLikeLock = new EntityConcurrentLock() { PersonID = personId };
entityConcurrentLockHandler.Add(entityLikeLock);
}
else
{
entityConcurrentLockHandler.MarkAsModified(entityLikeLockObj);
}
//2. 获取EntityLike对象。
var entityLikeObj = await Fetch(x => x.PersonID == personId && x.EntityID == entityId && x.EntityTableName == entityTable.Name).SingleOrDefaultAsync();
//3. 如果不存在则为点赞，存在则取消赞。
if(entityLikeObj == null)
{
entityLikeObj = new EntityLike()
{
PersonID = personId,
EntityID = entityId,
EntityTableName = entityTable.Name
};
Add(entityLikeObj);
isLike = true;
}
else
{
MarkAsDeleted(entityLikeObj);
isLike = false;
}
await _dbContext.SaveChangesAsync();
//4. 获取此点赞的Entity的总赞数。
int entityLikeCount = await CountAsync(x => x.EntityID == entityId && x.EntityTableName == entityTable.Name);
return new Tuple<bool, int>(isLike, entityLikeCount);
}
/// <summary>
/// 收藏或者取消收藏
/// </summary>
/// <param name="personId">PersonID</param>
/// <param name="blogId">BlogID</param>
/// <returns></returns>
public async Task<bool> CollectAsync(long personId, long blogId)
{
bool isFavorite = false;
//1. 获取EntityConcurruentLock对象，用于处理Concurrent。
EntityConcurrentLockHandler entityConcurrentLockHandler = new EntityConcurrentLockHandler(_dbContext);
var entityLikeLockObj = await entityConcurrentLockHandler.GetByIdAsync(personId);
if (entityLikeLockObj == null)
{
EntityConcurrentLock entityLikeLock = new EntityConcurrentLock() { PersonID = personId };
entityConcurrentLockHandler.Add(entityLikeLock);
}
else
{
entityConcurrentLockHandler.MarkAsModified(entityLikeLockObj);
}
//2. 获取Favorite对象。
var favoriteObj = await Fetch(x => x.PersonID == personId && x.BlogID == blogId).SingleOrDefaultAsync();
//3. 如果Favorite不存在则为收藏，存在则取消收藏。
if(favoriteObj == null)
{
favoriteObj = new Favorite()
{
PersonID = personId,
BlogID = blogId
};
Add(favoriteObj);
isFavorite = true;
}
else
{
MarkAsDeleted(favoriteObj);
isFavorite = false;
}
await _dbContext.SaveChangesAsync();
return isFavorite;
}