MyBookmark/Modules.Rating.Api/Commands/RateObjectCommand.cs

using MediatR;
using Modules.Rating.Api.Database.Entities;
using Modules.Rating.Api.Repositories;

namespace Modules.Rating.Api.Commands;

public class RateObjectCommand : IRequest<Unit>
{
    public Guid ObjectId { get; set; }
    public Guid SubjectId { get; set; }
    public ushort RatePercentage { get; set; }

}

public class RateObjectCommandHandler(RateRepository repository) : IRequestHandler<RateObjectCommand, Unit>
{
    public async Task<Unit> Handle(RateObjectCommand request, CancellationToken cancellationToken)
    {
        var key = new RateKey
        {
            ObjectId = request.ObjectId,
            SubjectId = request.SubjectId,
        };

        if (!await repository.IsRateExists(key))
        {
            await repository.AddAsync(new Rate { Key = key, RatePercentage = request.RatePercentage, });
        }
        else
        {
            await repository.UpdateAsync(new Rate { Key = key, RatePercentage = request.RatePercentage, });
        }
        return Unit.Value;
    }
}