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ersatztv/ErsatzTV.Application/Playouts/Queries/GetPlayoutByIdHandler.cs
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timothyandClaude Opus 4.8 c40ffefa99
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feat(253): PR3 optimistic-concurrency fan-out — Diff + Scalar aggregates
Fans the frozen Block recipe (api-conventions §7a) across the five Diff/Scalar
replace-all endpoints, completing the #253 PR2→PR4 arc's implementable core:

- #6 Collection custom-order, #7 Playout alternate-schedules, #8 Playout templates
  (shared Playout.Version), #9 MultiCollection, #10 RerunCollection — each: pre-check
  412 as a standalone Either after validation (H2, subtype survives the Join flatten),
  unconditional Version++ (M1), guarded save, controller If-Match/ETag/400/412, SPA
  editor ETag round-trip + 412 conflict dialog.
- H1: the two Playout handlers' catch(Exception)→422 restructured so the guard's
  PreconditionFailedError returns before the catch (412, not 422).
- M2: RerunCollection/Collection refresh runs unconditionally on save; MultiCollection
  keeps its name-only→no-rebuild optimization by bumping on the first (name) save.
- H3: UpdateDefaultDecoHandler bulk-bumps Playout.Version via .SetProperty.
- Shared ConcurrencyHeaders.MalformedIfMatchProblem() for the 400 guard.
- Deferred (→ #269): same-root non-bulk sibling config writers' ETag rotation.

Tests: per-handler pre-check/bump concurrency tests (Playout ×2 incl. non-vacuous
racing-save backstop, Rerun, Multi incl. name-only-no-rebuild M2, Collection);
controller tests get a DefaultHttpContext for the header read/write. Docs:
api-conventions §7a fan-out status, spa-conventions §4a list-editor note, decisions.

Refs #253

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-11 19:23:48 +02:00

37 lines
1.4 KiB
C#

using ErsatzTV.Infrastructure.Data;
using ErsatzTV.Infrastructure.Extensions;
using Microsoft.EntityFrameworkCore;
namespace ErsatzTV.Application.Playouts;
public class GetPlayoutByIdHandler(IDbContextFactory<TvContext> dbContextFactory)
: IRequestHandler<GetPlayoutById, Option<PlayoutNameViewModel>>
{
public async Task<Option<PlayoutNameViewModel>> Handle(
GetPlayoutById request,
CancellationToken cancellationToken)
{
await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync(cancellationToken);
return await dbContext.Playouts
.AsNoTracking()
.Include(p => p.ProgramSchedule)
.Include(p => p.Channel)
.Include(p => p.BuildStatus)
.Include(p => p.Deco)
.SelectOneAsync(p => p.Id, p => p.Id == request.PlayoutId, cancellationToken)
.MapT(p => new PlayoutNameViewModel(
p.Id,
p.ScheduleKind,
p.Channel.Name,
p.Channel.Number,
p.Channel.PlayoutMode,
p.ProgramScheduleId == null ? string.Empty : p.ProgramSchedule.Name,
p.ScheduleFile,
p.DailyRebuildTime,
p.BuildStatus,
p.DecoId,
p.DecoId == null ? null : p.Deco.Name,
p.Version));
}
}