How can I query the Tenant associated to an entity from another module? #10315

8 Answer(s)

• 

  0

  AI-Bot created yesterday

  Support Team ABP Agent

  1. Do not add a navigation property from your entity to Tenant

  In ABP’s SaaS model, the tenant is part of the SaaS / infrastructure context, not your domain. For entities implementing IMultiTenant, the recommended design is:

  public class Order : AggregateRoot<Guid>, IMultiTenant
  {
      public Guid? TenantId { get; set; }   // from IMultiTenant
  
      // other domain properties, no Tenant navigation here
  }
  

  Your module’s domain model should only know the TenantId. It should not depend on Tenant aggregate or ITenantRepository in the domain layer.

  ---

  2. Where to load tenant details (e.g. Name) for DTOs

  The tenant details are a read concern / UI concern, so resolve them in the application layer, not in domain entities:

  Option A – Use ITenantRepository in your Application Service

  If your module is allowed to depend on the SaaS domain package (Volo.Saas.Domain), inject ITenantRepository in your app service and map the tenant info into your DTOs:

  using Volo.Saas.Tenants;
  using Volo.Abp.Application.Dtos;
  
  public class MyEntityDto : EntityDto<Guid>
  {
      public Guid? TenantId { get; set; }
      public string? TenantName { get; set; }
      // other fields
  }
  
  public class MyEntityAppService : ApplicationService
  {
      private readonly IRepository<MyEntity, Guid> _myEntityRepository;
      private readonly ITenantRepository _tenantRepository;
  
      public MyEntityAppService(
          IRepository<MyEntity, Guid> myEntityRepository,
          ITenantRepository tenantRepository)
      {
          _myEntityRepository = myEntityRepository;
          _tenantRepository   = tenantRepository;
      }
  
      public async Task<MyEntityDto> GetAsync(Guid id)
      {
          var entity = await _myEntityRepository.GetAsync(id);
          var dto    = ObjectMapper.Map<MyEntity, MyEntityDto>(entity);
  
          if (entity.TenantId.HasValue)
          {
              var tenant = await _tenantRepository.FindAsync(entity.TenantId.Value);
              dto.TenantName = tenant?.Name;
          }
  
          return dto;
      }
  }
  

  Notes:

  • ITenantRepository is used only in the application layer, which is fine in DDD.
  • Your domain entities remain independent and only know TenantId.

  If you need this in list endpoints, batch-load tenants to avoid N+1 (e.g. get all distinct TenantIds, query tenants once, then map names).

  ---

  Option B – Call SaaS Application Service instead of Repository

  If you don’t want your module to depend on Saas domain, but you allow dependency on its application layer, you can inject ITenantAppService (from the Saas module) and use its DTOs:

  using Volo.Saas;
  
  public class MyEntityAppService : ApplicationService
  {
      private readonly IRepository<MyEntity, Guid> _myEntityRepository;
      private readonly ITenantAppService _tenantAppService;
  
      // inject ITenantAppService
  }
  

  Then resolve tenant names via ITenantAppService.GetAsync(id) (again, preferably in batch).

  This keeps your module depending only on SaaS application contracts, which is also a valid DDD-style boundary.

  ---

  3. When you need richer tenant data frequently

  If you often need tenant-related info (e.g. name + some extra fields) together with your entities, a common pattern is:

  • Keep your domain entities with TenantId only.
  • Create a read model / projection in your own module (e.g. TenantSummary table) and keep it in sync with SaaS via:
    • data seeding, or
    • distributed events from SaaS when tenant changes.
  • Query that read model from your app service and project into DTOs.

  This avoids a hard dependency on the SaaS domain model and is suitable for more complex or performance-critical scenarios.

  ---

  4. What not to do

  • Don’t add a navigation property like public Tenant Tenant { get; set; } on your entities.
  • Don’t use ITenantRepository inside domain services or entities.
  • Don’t rely on ICurrentTenant when you need the tenant of an arbitrary entity; ICurrentTenant is only for the current context.

  ---

  Summary

  • Keep entities IMultiTenant with only TenantId.
  • Load tenant details in the application layer:
    • Either via ITenantRepository (domain-level dependency from app layer), or
    • via SaaS application service (ITenantAppService).
  • Optionally introduce your own read model if you need richer or more optimized tenant info.

  ---

  Sources

  • Multi-tenancy concepts and IMultiTenant usage:
    https://abp.io/docs/latest/framework/architecture/multi-tenancy

  ---

  This response was generated by AI. If it didn’t solve your problem, feel free to post a new answer — our support team will jump in to help you soon.

  Save Cancel
• 

  0

  zokho created yesterday

  how can I have a reference to the ITenantAppService from my module though? should I add a specific abp package via Nuget?

  Save Cancel
• 

  0

  AI-Bot created yesterday

  Support Team ABP Agent

  1. To which assembly should you reference?

  ITenantAppService is defined in the SaaS module’s application contracts:

  • Namespace: Volo.Saas
  • Assembly / package: Volo.Saas.Application.Contracts

  From your own module’s Application layer, you should depend on this contracts package (or project), not on the SaaS implementation.

  ---

  2. Add the dependency (NuGet or project reference)

  a) If you are using the commercial SaaS module as NuGet

  In your <YourModule>.Application project:

  .csproj

  <ItemGroup>
    <PackageReference Include="Volo.Saas.Application.Contracts" Version="*" />
  </ItemGroup>
  

  (Use the same version as the rest of your ABP packages.)

  Module class

  using Volo.Saas;
  
  [DependsOn(
      typeof(SaasApplicationContractsModule) // <- important
  )]
  public class MyModuleApplicationModule : AbpModule
  {
  }
  

  Now you can inject ITenantAppService anywhere in this application module:

  using Volo.Saas;
  
  public class MyEntityAppService : ApplicationService
  {
      private readonly ITenantAppService _tenantAppService;
  
      public MyEntityAppService(ITenantAppService tenantAppService)
      {
          _tenantAppService = tenantAppService;
      }
  
      // use _tenantAppService.GetAsync(id) etc.
  }
  

  ---

  b) If your solution has a separate Saas.Application.Contracts project

  In that case, instead of NuGet, add a project reference from your module’s *.Application project to the Saas.Application.Contracts project, and still annotate your module with:

  [DependsOn(typeof(SaasApplicationContractsModule))]
  public class MyModuleApplicationModule : AbpModule
  {
  }
  

  Everything else is the same; you can inject ITenantAppService normally.

  ---

  3. Why this is OK in DDD terms

  • Your domain layer stays independent of tenants (other than the TenantId value).
  • Your application layer is allowed to depend on other bounded contexts’ application contracts (like SaaS), so calling ITenantAppService here is a standard and recommended pattern.

  ---

  2. Sources

  • https://abp.io/docs/latest/framework/architecture/multi-tenancy

  ---

  This response was generated by AI. If it didn’t solve your problem, feel free to post a new answer — our support team will jump in to help you soon.

  Save Cancel
• 

  0

  zokho created yesterday

  there is no package name as Volo.Saas.Application.Contracts but there is one as Volo.Saas.Host.Application.Contracts which is already added in the main module of my solution. Should I add the package in my module Application.Contracts project?

  Save Cancel
• 

  0

  AI-Bot created yesterday

  Support Team ABP Agent

  1. Which package/module to reference

  In the app template with SaaS host side, ITenantAppService is in the host contracts package:

  • Assembly / NuGet: Volo.Saas.Host.Application.Contracts
  • Module class: SaasHostApplicationContractsModule
  • Namespace of the interface: Volo.Saas

  So you should depend on Volo.Saas.Host.Application.Contracts, not on a non‑existing Volo.Saas.Application.Contracts.

  ---

  2. Where to add the reference

  You normally need ITenantAppService only in your Application layer, where you build DTOs and orchestrate calls.

  • Add the package/project reference to your module’s *.Application project.
  • Do not add it to your module’s *.Application.Contracts project unless you really need to expose SaaS DTOs in your own public contracts.

  a) MyModule.Application.csproj

  If you’re using NuGet packages:

  <ItemGroup>
    <PackageReference Include="Volo.Saas.Host.Application.Contracts" Version="x.y.z" />
  </ItemGroup>
  

  (Use the same x.y.z ABP/Commercial version as the rest of your solution.)

  Or, if you have a Saas.Host.Application.Contracts project in the solution, just add a project reference instead of NuGet.

  b) Application module class

  In your module’s Application project:

  using Volo.Abp.Modularity;
  using Volo.Saas.Host; // for SaasHostApplicationContractsModule
  
  [DependsOn(
      typeof(SaasHostApplicationContractsModule)
      // other dependencies...
  )]
  public class MyModuleApplicationModule : AbpModule
  {
  }
  

  Now you can inject ITenantAppService in your app services:

  using Volo.Saas;
  
  public class MyEntityAppService : ApplicationService
  {
      private readonly ITenantAppService _tenantAppService;
  
      public MyEntityAppService(ITenantAppService tenantAppService)
      {
          _tenantAppService = tenantAppService;
      }
  
      public async Task<MyEntityDto> GetAsync(Guid id)
      {
          var entity = await Repository.GetAsync(id);
          var dto = ObjectMapper.Map<MyEntity, MyEntityDto>(entity);
  
          if (entity.TenantId.HasValue)
          {
              var tenantDto = await _tenantAppService.GetAsync(entity.TenantId.Value);
              dto.TenantName = tenantDto.Name;
          }
  
          return dto;
      }
  }
  

  ---

  3. Should you add it to your Application.Contracts project?

  • Usually no. Application.Contracts of your module should define your own DTOs and service interfaces and stay relatively clean.
  • Add Volo.Saas.Host.Application.Contracts there only if:
    • You want to use SaaS DTO types in your public service contracts, or
    • You need to expose some tenant DTO as part of your own DTOs.

  If you just need tenant info internally to build DTOs, referencing it only from *.Application is the cleaner approach.

  ---

  Sources

  • Multi-tenancy basics:
    https://abp.io/docs/latest/framework/architecture/multi-tenancy
  • SaaS module docs:
    https://abp.io/docs/latest/modules/saas

  ---

  This response was generated by AI. If it didn’t solve your problem, feel free to post a new answer — our support team will jump in to help you soon.

  Save Cancel
• 

  0

  maliming created yesterday

  Support Team Fullstack Developer

  hi

  Please ignore the AI answer.

  You can query the entities from your module.

  then you can get TenantId, then inject the ITenantStore service to query tenant info by TenantId.

  Thanks.

  Save Cancel
• 

  0

  zokho created yesterday

  Great! Thanks!

  Save Cancel
• 

  0

  maliming created yesterday

  Support Team Fullstack Developer

  : )

  Save Cancel