public EitherAsync <Error, Unit> FollowAccountAsync(Guid followerId, Guid followeeId)
{
if (followerId == followeeId)
{
return(Errors.CannotFollowSelf);
}
var followeeContext = GetAccountByIdAsync(followeeId).ToAsync();
var followerContext = GetAccountByIdAsync(followerId).ToAsync();
return
(followeeContext.Bind(followee =>
followerContext.Bind(follower =>
IsFollowingAccount(followerId, followeeId).BindAsync <Unit>(async isFollowing =>
{
if (isFollowing)
{
return Errors.AlreadyFollowing;
}
await _dbContext.Entry(followee)
.Collection(nameof(followee.Followers))
.LoadAsync();
followee.Followers.Add(follower);
await _dbContext.UpdateAsync(followee);
return unit;
}))));
}
// TODO: Remove code repetition
public async Task <Either <Error, Unit> > LikePostAsync(Guid accountId, Guid postId)
{
var result =
from post in GetPostByIdAsync(postId).ToAsync()
from account in _accountService.GetAccountByIdAsync(accountId).ToAsync()
select(post, account);
return(await result.MatchAsync <Either <Error, Unit> >(
async res =>
{
await _dbContext.Entry(res.account)
.Collection(nameof(res.account.Likes))
.LoadAsync();
if (res.account.Likes.Contains(res.post))
{
return unit;
}
res.account.Likes.Add(res.post);
await _dbContext.UpdateAsync(res.account);
return unit;
},
err => err
));
}