Add LambdaInitialData<T> + AddInitialData lambda overload (8.14.0)#250
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jeremydmiller merged 1 commit intomasterfrom Apr 20, 2026
Merged
Add LambdaInitialData<T> + AddInitialData lambda overload (8.14.0)#250jeremydmiller merged 1 commit intomasterfrom
jeremydmiller merged 1 commit intomasterfrom
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Lets callers register small inline seeders without authoring a dedicated
IInitialData<TContext> class:
services.AddInitialData<ShopDbContext>(async (ctx, ct) =>
{
ctx.Customers.Add(new ShopCustomer { Name = "Inline" });
await ctx.SaveChangesAsync(ct);
});
Registered as a singleton LambdaInitialData<T> so it coexists with the
existing class-based AddInitialData<TContext, TData>() form and runs in
registration order via the DatabaseCleaner<T>.ResetAllDataAsync path.
Also adds a [Collection("FkDependencyDbContext")] guard to
database_cleaner_tests so it serializes with the new
lambda_initial_data_tests (both share the fk_dep_test schema).
Bumps Directory.Build.props Version to 8.14.0 for the Wolverine consumer
that depends on this work (JasperFx/wolverine#2539).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Makes the EF Core dev-loop faster and more discoverable:
- Auto-register Weasel's DatabaseCleaner<> (open generic) inside
UseEntityFrameworkCoreTransactions(). Callers no longer need a
per-context services.AddDatabaseCleaner<T>() — resolving
IDatabaseCleaner<T> / DatabaseCleaner<T> just works.
- New IHost.ResetAllDataAsync<T>() extension for finer-grained
per-DbContext test teardown. Creates its own scope, resolves the
DbContext first, then the cleaner, then runs delete+reseed.
- New documentation:
* docs/guide/durability/efcore/index.md — Development-time usage
section covering Weasel migrations vs EF Core migrations,
IInitialData mention, and reset guidance.
* docs/guide/durability/efcore/initial-data.md — IInitialData<T>
patterns: class-based vs lambda, layered seeders, idempotency,
when not to use.
* docs/guide/durability/efcore/batch-queries.md — four handler
patterns for the Wolverine batching story, with locally measured
perf numbers (2.78x speedup, 4-query handler) and links out to
Weasel's fluent BatchedQuery reference.
- Weasel link sweep: replaced github.com links with
https://weasel.jasperfx.net/... where applicable.
- ItemService sample: SeedSampleItems IInitialData<ItemsDbContext>
registered via AddInitialData<TContext, TData>(), with a comment
showing the Weasel 8.14 lambda overload.
- Bumps Weasel.* package references to 8.14.0 to pick up the new
LambdaInitialData<T> + AddInitialData lambda overload
(JasperFx/weasel#250).
Tests: 7/7 pass for the cleaner-related suite
(auto_database_cleaner_registration_tests + database_cleaner_usage_tests).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Lets callers register small inline seeders without authoring a dedicated
IInitialData<TContext>class:Registered as a singleton
LambdaInitialData<T>so it coexists with the existing class-basedAddInitialData<TContext, TData>()form and runs in registration order viaDatabaseCleaner<T>.ResetAllDataAsync.Background
Needed by Wolverine GH-2539 — part of the "EF Core dev-time improvements" bullet list. Wolverine will consume the new API in its dev-time documentation and reset-between-tests story. Package bumped to 8.14.0 so Wolverine can pull the new version.
Changes
src/Weasel.EntityFrameworkCore/LambdaInitialData.csIInitialData<TContext>implementation wrapping aFunc<TContext, CancellationToken, Task>src/Weasel.EntityFrameworkCore/DatabaseCleanerExtensions.csAddInitialData<TContext>(Func<TContext, CancellationToken, Task>)overload registered as singletonsrc/Weasel.EntityFrameworkCore.Tests/Postgresql/lambda_initial_data_tests.cssrc/Weasel.EntityFrameworkCore.Tests/Postgresql/database_cleaner_tests.cs[Collection("FkDependencyDbContext")]so it serializes with the new suite (both share thefk_dep_testschema)src/DocSamples/DatabaseCleanerSamples.cssample_efcore_lambda_initial_dataregiondocs/efcore/database-cleaner.mdIInitialDataDirectory.Build.propsTest plan
dotnet test --framework net9.0 --filter "FullyQualifiedName~lambda_initial_data|FullyQualifiedName~database_cleaner"— 7/7 pass (3 new + 4 existing cleaner tests)dotnet build— 0 errors🤖 Generated with Claude Code