47 lines
1.7 KiB
C#
47 lines
1.7 KiB
C#
using MediatR;
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using TakeoutSaaS.Application.App.Tenants.Dto;
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using TakeoutSaaS.Application.App.Tenants.Queries;
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using TakeoutSaaS.Domain.Tenants.Repositories;
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using TakeoutSaaS.Shared.Abstractions.Security;
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namespace TakeoutSaaS.Application.App.Tenants.Handlers;
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/// <summary>
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/// 公告详情查询处理器。
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/// </summary>
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public sealed class GetTenantAnnouncementQueryHandler(
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ITenantAnnouncementRepository announcementRepository,
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ITenantAnnouncementReadRepository readRepository,
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ICurrentUserAccessor? currentUserAccessor = null)
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: IRequestHandler<GetTenantAnnouncementQuery, TenantAnnouncementDto?>
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{
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public async Task<TenantAnnouncementDto?> Handle(GetTenantAnnouncementQuery request, CancellationToken cancellationToken)
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{
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// 1. 查询公告主体
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var announcement = await announcementRepository.FindByIdAsync(request.TenantId, request.AnnouncementId, cancellationToken);
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if (announcement == null)
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{
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return null;
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}
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// 2. 优先查用户级已读
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var userId = currentUserAccessor?.UserId ?? 0;
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var reads = await readRepository.GetByAnnouncementAsync(
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request.TenantId,
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new[] { request.AnnouncementId },
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userId == 0 ? null : userId,
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cancellationToken);
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// 如无用户级已读，再查租户级已读
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if (reads.Count == 0)
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{
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var tenantReads = await readRepository.GetByAnnouncementAsync(request.TenantId, new[] { request.AnnouncementId }, null, cancellationToken);
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reads = tenantReads;
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}
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// 3. 返回 DTO 并附带已读状态
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var readRecord = reads.FirstOrDefault();
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return announcement.ToDto(readRecord != null, readRecord?.ReadAt);
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}
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}
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