feat: 商户类目数据库化并增加权限种子

src/Application/TakeoutSaaS.Application/App/Merchants/Handlers/GetMerchantContractsQueryHandler.cs

@@ -0,0 +1,32 @@
+using System.Collections.Generic;
+using MediatR;
+using TakeoutSaaS.Application.App.Merchants.Dto;
+using TakeoutSaaS.Application.App.Merchants.Queries;
+using TakeoutSaaS.Domain.Merchants.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Constants;
+using TakeoutSaaS.Shared.Abstractions.Exceptions;
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
+
+namespace TakeoutSaaS.Application.App.Merchants.Handlers;
+
+/// <summary>
+/// 查询合同列表。
+/// </summary>
+public sealed class GetMerchantContractsQueryHandler(
+    IMerchantRepository merchantRepository,
+    ITenantProvider tenantProvider)
+    : IRequestHandler<GetMerchantContractsQuery, IReadOnlyList<MerchantContractDto>>
+{
+    private readonly IMerchantRepository _merchantRepository = merchantRepository;
+    private readonly ITenantProvider _tenantProvider = tenantProvider;
+
+    public async Task<IReadOnlyList<MerchantContractDto>> Handle(GetMerchantContractsQuery request, CancellationToken cancellationToken)
+    {
+        var tenantId = _tenantProvider.GetCurrentTenantId();
+        _ = await _merchantRepository.FindByIdAsync(request.MerchantId, tenantId, cancellationToken)
+            ?? throw new BusinessException(ErrorCodes.NotFound, "商户不存在");
+
+        var contracts = await _merchantRepository.GetContractsAsync(request.MerchantId, tenantId, cancellationToken);
+        return MerchantMapping.ToContractDtos(contracts);
+    }
+}