hackernet/HackerNet.Infrastructure/Repositories/EntityFramework/EFReadStore.cs

using HackerNet.Application;

namespace HackerNet.Infrastructure.Repositories.EntityFramework;

public class EFReadStore : IReadStore
{
  private readonly HackerContext _context;

  public EFReadStore(HackerContext context)
  {
    _context = context;
  }

  public LinkComment[] GetLinkComments(Guid linkId)
   => _context.Comments
      .OrderByDescending(c => c.CreatedAt)
      .Select(c => new LinkComment
      {
        Content = c.Content
      }).ToArray();

  public LinkHomePage GetLinkDetail(Guid id)
    => GetLinks(id).Single();

  public LinkHomePage[] GetPublishedLinks()
    => GetLinks().ToArray();

  private IQueryable<LinkHomePage> GetLinks(Guid? id = null)
  {
    return _context.Links
      .Where(l => !id.HasValue || l.Id == id)
      .OrderByDescending(l => l.CreatedAt)
      .Select(l => new LinkHomePage
      {
        Id = l.Id,
        Url = l.Url,
        Description = l.Description,
        CommentsCount = _context.Comments
          .Count(c => c.LinkId == l.Id),
      });
  }
}