DataSeederContributer is not treggered at startup #10066

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  AI-Bot created yesterday

  Support Team ABP Agent

  1. Solution In ABP, IDataSeedContributor runs only when AbpDataSeeder is invoked. In microservice solutions, this is typically done by the DbMigrator (and sometimes by each service host during startup, depending on the template). If your custom contributor runs only when you paste the logic into the service’s existing DataSeeder class, it means your contributor is not being discovered/invoked at the time AbpDataSeeder.SeedAsync is called.

  Follow these checks to ensure your custom DataSeederContributor runs at startup:

  • Place the contributor in a loaded module

    • The class must be in a project/module that is actually depended on by the host you expect to run seeding in (e.g., DbMigrator or the specific service host).
    • Ensure the module is added via [DependsOn] in the relevant Host module so its services are registered.

  • Implement the correct interfaces and lifetime

    • The contributor must implement: public class MyEntityDataSeedContributor : IDataSeedContributor, ITransientDependency
    • Do not use scoped/singleton here; ABP discovers transient contributors automatically.

  • Ensure the DbContext and module dependencies are configured before seeding

    • If your contributor uses repositories/entities from other modules (e.g., Identity, SaaS, your module), the EF Core module must be properly configured in the DbContext and the module’s EFCore module must be depended on by the DbMigrator/host.
    • Example for Identity-related entities (when using FullAuditedEntityWithUser or relations to IdentityUser):
      • Add the proper EF Core package to the module (e.g., Volo.Abp.Identity.Pro.EntityFrameworkCore if you use Identity Pro entities).
      • In your DbContext.OnModelCreating, call the module’s Configure... method before your own mappings, e.g.: protected override void OnModelCreating(ModelBuilder builder) { base.OnModelCreating(builder); builder.ConfigureIdentityPro(); // or builder.ConfigureIdentity(); depending on your package builder.ConfigureMyModule(); }
      • Ensure your module depends on the corresponding EFCore module: [DependsOn(typeof(AbpIdentityProEntityFrameworkCoreModule))] // or AbpIdentityEntityFrameworkCoreModule

  • Make sure AbpDataSeeder is actually invoked for the service where you expect seeding

    • DbMigrator: It already calls IDataSeeder.SeedAsync; your contributor will run there if discovered.
    • Service host: If you want seeding during service startup, ensure the host’s module calls IDataSeeder.SeedAsync in OnApplicationInitialization (or that the template’s seeding pipeline includes your module). A common pattern: public override async Task OnApplicationInitializationAsync(ApplicationInitializationContext context) { var seeder = context.ServiceProvider.GetRequiredService<IDataSeeder>(); await seeder.SeedAsync(); // or with a DataSeedContext as needed }

  • Multi-tenancy context

    • If you need to seed for host and/or tenants, use DataSeedContext and/or ICurrentTenant correctly. For per-tenant seeding, you typically loop tenants in DbMigrator and pass tenantId via new DataSeedContext(tenantId). Your contributor’s SeedAsync should work with the given context.

  • Order and conditions

    • If your contributor depends on data seeded by others, add ordering via IOrderedDataSeedContributor or check data existence safely. Also ensure your SeedAsync is idempotent.

  • Verify registration and execution

    • Temporarily log inside SeedAsync.
    • Confirm the assembly containing the contributor is loaded by the host process.
    • Ensure there are no conditional registrations replacing IDataSeeder or skipping environment profiles.

  Quick working example

  • Contributor: public class MyEntityDataSeedContributor : IDataSeedContributor, ITransientDependency { private readonly IRepository<MyEntity, Guid> _repo;

    public MyEntityDataSeedContributor(IRepository<MyEntity, Guid> repo)
    {
        _repo = repo;
    }
    
    public async Task SeedAsync(DataSeedContext context)
    {
        if (await _repo.GetCountAsync() == 0)
        {
            await _repo.InsertAsync(new MyEntity("Sample"));
        }
    }
    

    }

  • Host module ensures seeding: [DependsOn( typeof(MyServiceEntityFrameworkCoreModule), typeof(AbpEntityFrameworkCoreSqlServerModule) )] public class MyServiceHttpApiHostModule : AbpModule { public override async Task OnApplicationInitializationAsync(ApplicationInitializationContext context) { var dataSeeder = context.ServiceProvider.GetRequiredService<IDataSeeder>(); await dataSeeder.SeedAsync(new DataSeedContext(null)); // host context } }

  • If using Identity Pro types in your module DbContext: [DependsOn(typeof(AbpIdentityProEntityFrameworkCoreModule))] public class MyServiceEntityFrameworkCoreModule : AbpModule { /* ... */ }

    protected override void OnModelCreating(ModelBuilder builder) { base.OnModelCreating(builder); builder.ConfigureIdentityPro(); builder.ConfigureMyService(); }

  Why it worked when pasted into the template DataSeeder

  • That DataSeeder class is already in the host that calls IDataSeeder.SeedAsync, so its logic runs. Your external contributor didn’t run because it either wasn’t registered (module not depended on by the host), the EF Core model for required dependencies wasn’t configured (e.g., missing ConfigureIdentity/ConfigureIdentityPro), or the host never invoked AbpDataSeeder.

  2. Sources

  • Validated:
    • ABP Framework GitHub (general reference): https://github.com/abpframework/abp
  • This approach aligns with common ABP conventions for data seeding in microservice solutions. Specific official documentation pages for every bullet above are not all available in a single doc page.

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  icoretchi created yesterday

  Hi,

  Everything is configured properly, I consider that is an error on discovering IDataSeedContributor.

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  maliming created 7 hours ago

  Support Team Fullstack Developer

  hi

  Can you share your contributor and microservice tempate service DataSeeder class code?

  Thanks.

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