public async Task <MemeRating> FetchRating(MemeReaction reaction)
{
var rating = await _context.MemeRatings
.FirstOrDefaultAsync(r =>
r.MemeId == reaction.MemeId && r.UserId == reaction.UserId);
if (rating == null)
{
rating = new MemeRating()
{
UserId = reaction.UserId,
MemeId = reaction.MemeId,
};
await _context.MemeRatings.AddAsync(rating);
}
return(rating);
}
private IBgcMemeRepository CreateMockRepository(MemeReaction reaction, sbyte vote)
{
var mockRepo = Substitute.For <IBgcMemeRepository>();
mockRepo.DrawMeme(1)
.Returns(Task.FromResult(new Meme()
{
Id = 1,
Rating = 0,
}));
mockRepo.FetchRating(reaction)
.Returns(Task.FromResult(new MemeRating()
{
MemeId = reaction.MemeId,
UserId = reaction.UserId,
Vote = vote
}));
return(mockRepo);
}
public async Task MemeReaction_DbIntegration()
{
using (var contextProvider = new EFInMemoryDbCreator.Sqlite <BgcFullContext>())
{
// arrange
var context = contextProvider.CreateContext(c => c.SeedUsers(1).SeedMemes(10));
var repo = new BgcMemeRepo(context);
var sessions = new BgcSessionsRepo(context);
var controller = new MemeListController(repo, sessions);
var reaction = new MemeReaction()
{
MemeId = _random.Next(1, EFInMemoryDbCreator.MemeCount),
UserId = 1,
Vote = (sbyte)(_random.Next(0, 10) % 2 == 0 ? -1 : 1)
};
var mRating = (await repo.DrawMeme(reaction.MemeId)).Rating;
// act
var outcome = await controller.MemeReaction(reaction);
// fresh context
repo = new BgcMemeRepo(contextProvider.GetFreshContext());
// prepare assert
var rating = await repo.FetchRating(reaction);
var meme2 = await repo.DrawMeme(reaction.MemeId);
// assert
Assert.AreEqual(reaction.Vote, rating.Vote);
Assert.AreNotEqual(meme2.Rating, mRating);
mRating += reaction.Vote;
Assert.AreEqual(mRating, meme2.Rating);
Assert.AreEqual(outcome.Rating, meme2.Rating);
Assert.AreEqual(1, rating.Id);
}
}
public async Task <MemeState> MemeReaction([FromBody] MemeReaction reaction)
{
if (ModelState.IsValid == false)
{
return(null);
}
var meme = await _repo.DrawMeme(reaction.MemeId);
var earlierRating = await _repo.FetchRating(reaction);
// prevent forgering of likes without client
if (reaction.Vote == earlierRating.Vote)
{
return(null);
}
// add rating
if (reaction.Vote != 0)
{
meme.Rating += reaction.Vote - earlierRating.Vote;
earlierRating.Vote = reaction.Vote;
}
// remove previous, user undid his rating
else
{
meme.Rating -= earlierRating.Vote;
_repo.DeleteRating(earlierRating);
}
_repo.SaveChanges();
return(new MemeState()
{
CommentCount = meme.CommentCount,
Rating = meme.Rating,
Vote = reaction.Vote
});
}
