feat(store): auto-generate store code on create and make update code optional

src/Application/TakeoutSaaS.Application/App/Stores/Commands/CreateStoreCommand.cs

@@ -14,11 +14,6 @@ public sealed record CreateStoreCommand : IRequest
     /// </summary>
     public string Name { get; init; } = string.Empty;
 
-    /// <summary>
-    /// 门店编码。
-    /// </summary>
-    public string Code { get; init; } = string.Empty;
-
     /// <summary>
     /// 联系电话。
     /// </summary>

src/Application/TakeoutSaaS.Application/App/Stores/Commands/UpdateStoreCommand.cs

@@ -23,9 +23,9 @@ public sealed record UpdateStoreCommand : IRequest
     public string Name { get; init; } = string.Empty;
 
     /// <summary>
-    /// 门店编码。
+    /// 门店编码（可选，未传时保持原值）。
     /// </summary>
-    public string Code { get; init; } = string.Empty;
+    public string? Code { get; init; }
 
     /// <summary>
     /// 联系电话。

src/Application/TakeoutSaaS.Application/App/Stores/Handlers/CreateStoreCommandHandler.cs

@@ -1,4 +1,5 @@
 using MediatR;
+using System.Security.Cryptography;
 using TakeoutSaaS.Application.App.Stores.Commands;
 using TakeoutSaaS.Application.App.Stores.Enums;
 using TakeoutSaaS.Application.App.Stores.Services;
@@ -24,7 +25,7 @@ public sealed class CreateStoreCommandHandler(
         // 1. 解析上下文
         var context = storeContextService.GetRequiredContext();
 
-        // 2. 校验编码唯一性
+        // 2. 生成唯一门店编码
         var existingStores = await storeRepository.SearchAsync(
             context.TenantId,
             context.MerchantId,
@@ -35,12 +36,7 @@ public sealed class CreateStoreCommandHandler(
             keyword: null,
             includeDeleted: false,
             cancellationToken: cancellationToken);
-        var normalizedCode = request.Code.Trim();
-        var hasDuplicateCode = existingStores.Any(store => string.Equals(store.Code, normalizedCode, StringComparison.OrdinalIgnoreCase));
-        if (hasDuplicateCode)
-        {
-            throw new BusinessException(ErrorCodes.Conflict, "门店编码已存在");
-        }
+        var generatedCode = GenerateUniqueStoreCode(existingStores);
 
         // 3. 组装门店实体
         var serviceTypes = request.ServiceTypes?.Count > 0
@@ -50,7 +46,7 @@ public sealed class CreateStoreCommandHandler(
         {
             TenantId = context.TenantId,
             MerchantId = context.MerchantId,
-            Code = normalizedCode,
+            Code = generatedCode,
             Name = request.Name.Trim(),
             Phone = request.ContactPhone.Trim(),
             ManagerName = request.ManagerName.Trim(),
@@ -68,4 +64,27 @@ public sealed class CreateStoreCommandHandler(
         await storeRepository.AddStoreAsync(store, cancellationToken);
         await storeRepository.SaveChangesAsync(cancellationToken);
     }
+
+    /// <summary>
+    /// 生成当前租户商户内唯一的门店编码。
+    /// </summary>
+    private static string GenerateUniqueStoreCode(IReadOnlyList<Store> existingStores)
+    {
+        var existingCodeSet = existingStores
+            .Select(store => store.Code.Trim())
+            .Where(code => !string.IsNullOrWhiteSpace(code))
+            .ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        const int maxRetryCount = 20;
+        for (var attempt = 0; attempt < maxRetryCount; attempt++)
+        {
+            var candidate = $"ST{DateTime.UtcNow:yyMMddHHmmss}{RandomNumberGenerator.GetInt32(100, 1000)}";
+            if (existingCodeSet.Add(candidate))
+            {
+                return candidate;
+            }
+        }
+
+        throw new BusinessException(ErrorCodes.Conflict, "门店编码生成失败，请稍后重试");
+    }
 }

src/Application/TakeoutSaaS.Application/App/Stores/Handlers/UpdateStoreCommandHandler.cs

@@ -30,28 +30,33 @@ public sealed class UpdateStoreCommandHandler(
             throw new BusinessException(ErrorCodes.Forbidden, "无权操作其他商户门店");
         }
 
-        // 3. 校验编码唯一性
-        var existingStores = await storeRepository.SearchAsync(
-            context.TenantId,
-            context.MerchantId,
-            status: null,
-            auditStatus: null,
-            businessStatus: null,
-            ownershipType: null,
-            keyword: null,
-            includeDeleted: false,
-            cancellationToken: cancellationToken);
-        var normalizedCode = request.Code.Trim();
-        var hasDuplicateCode = existingStores.Any(store =>
-            store.Id != existing.Id &&
-            string.Equals(store.Code, normalizedCode, StringComparison.OrdinalIgnoreCase));
-        if (hasDuplicateCode)
+        // 3. 若传入编码且发生变化，则校验唯一性并更新编码。
+        var normalizedCode = request.Code?.Trim();
+        if (!string.IsNullOrWhiteSpace(normalizedCode) &&
+            !string.Equals(existing.Code, normalizedCode, StringComparison.OrdinalIgnoreCase))
         {
-            throw new BusinessException(ErrorCodes.Conflict, "门店编码已存在");
+            var existingStores = await storeRepository.SearchAsync(
+                context.TenantId,
+                context.MerchantId,
+                status: null,
+                auditStatus: null,
+                businessStatus: null,
+                ownershipType: null,
+                keyword: null,
+                includeDeleted: false,
+                cancellationToken: cancellationToken);
+            var hasDuplicateCode = existingStores.Any(store =>
+                store.Id != existing.Id &&
+                string.Equals(store.Code, normalizedCode, StringComparison.OrdinalIgnoreCase));
+            if (hasDuplicateCode)
+            {
+                throw new BusinessException(ErrorCodes.Conflict, "门店编码已存在");
+            }
+
+            existing.Code = normalizedCode;
         }
 
         // 4. 更新门店字段
-        existing.Code = normalizedCode;
         existing.Name = request.Name.Trim();
         existing.Phone = request.ContactPhone.Trim();
         existing.ManagerName = request.ManagerName.Trim();

src/Application/TakeoutSaaS.Application/App/Stores/Validators/CreateStoreCommandValidator.cs

@@ -15,7 +15,6 @@ public sealed class CreateStoreCommandValidator : AbstractValidator<CreateStoreC
     {
         // 1. 校验核心字段
         RuleFor(command => command.Name).NotEmpty().MaximumLength(128);
-        RuleFor(command => command.Code).NotEmpty().MaximumLength(32);
         RuleFor(command => command.ContactPhone).NotEmpty().MaximumLength(32);
         RuleFor(command => command.ManagerName).NotEmpty().MaximumLength(64);
         RuleFor(command => command.Address).NotEmpty().MaximumLength(256);

src/Application/TakeoutSaaS.Application/App/Stores/Validators/UpdateStoreCommandValidator.cs

@@ -16,7 +16,10 @@ public sealed class UpdateStoreCommandValidator : AbstractValidator<UpdateStoreC
         // 1. 校验标识与核心字段
         RuleFor(command => command.Id).GreaterThan(0);
         RuleFor(command => command.Name).NotEmpty().MaximumLength(128);
-        RuleFor(command => command.Code).NotEmpty().MaximumLength(32);
+        RuleFor(command => command.Code)
+            .NotEmpty()
+            .MaximumLength(32)
+            .When(command => command.Code is not null);
         RuleFor(command => command.ContactPhone).NotEmpty().MaximumLength(32);
         RuleFor(command => command.ManagerName).NotEmpty().MaximumLength(64);
         RuleFor(command => command.Address).NotEmpty().MaximumLength(256);