81 lines
2.7 KiB
C#
81 lines
2.7 KiB
C#
using Microsoft.EntityFrameworkCore;
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using System.Reflection;
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using TakeoutSaaS.Shared.Abstractions.Entities;
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using TakeoutSaaS.Shared.Abstractions.Ids;
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using TakeoutSaaS.Shared.Abstractions.Security;
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using TakeoutSaaS.Shared.Abstractions.Tenancy;
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namespace TakeoutSaaS.Infrastructure.Common.Persistence;
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/// <summary>
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/// 多租户感知 DbContext：自动应用租户过滤并填充租户字段。
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/// </summary>
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public abstract class TenantAwareDbContext(
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DbContextOptions options,
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ITenantProvider tenantProvider,
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ICurrentUserAccessor? currentUserAccessor = null,
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IIdGenerator? idGenerator = null) : AppDbContext(options, currentUserAccessor, idGenerator)
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{
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/// <summary>
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/// 当前请求租户 ID。
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/// </summary>
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protected long CurrentTenantId => tenantProvider.GetCurrentTenantId();
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/// <summary>
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/// 保存前填充租户元数据并执行基础处理。
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/// </summary>
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protected override void OnBeforeSaving()
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{
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ApplyTenantMetadata();
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base.OnBeforeSaving();
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}
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/// <summary>
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/// 应用租户过滤器到所有实现 <see cref="IMultiTenantEntity"/> 的实体。
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/// </summary>
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/// <param name="modelBuilder">模型构建器。</param>
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protected void ApplyTenantQueryFilters(ModelBuilder modelBuilder)
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{
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foreach (var entityType in modelBuilder.Model.GetEntityTypes())
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{
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if (!typeof(IMultiTenantEntity).IsAssignableFrom(entityType.ClrType))
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{
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continue;
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}
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var methodInfo = typeof(TenantAwareDbContext)
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.GetMethod(nameof(SetTenantFilter), BindingFlags.Instance | BindingFlags.NonPublic)!
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.MakeGenericMethod(entityType.ClrType);
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methodInfo.Invoke(this, new object[] { modelBuilder });
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}
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}
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/// <summary>
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/// 为具体实体设置租户过滤器。
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/// </summary>
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/// <typeparam name="TEntity">实体类型。</typeparam>
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/// <param name="modelBuilder">模型构建器。</param>
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private void SetTenantFilter<TEntity>(ModelBuilder modelBuilder)
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where TEntity : class, IMultiTenantEntity
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{
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modelBuilder.Entity<TEntity>().HasQueryFilter(entity => entity.TenantId == CurrentTenantId);
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}
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/// <summary>
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/// 为新增实体填充租户 ID。
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/// </summary>
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private void ApplyTenantMetadata()
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{
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var tenantId = CurrentTenantId;
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foreach (var entry in ChangeTracker.Entries<IMultiTenantEntity>())
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{
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if (entry.State == EntityState.Added && entry.Entity.TenantId == 0 && tenantId != 0)
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{
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entry.Entity.TenantId = tenantId;
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}
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}
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}
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}
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