EF Core InMemory DB does not apply configurations from assembly and returns no data - entity-framework

Question

I'm trying to test my app with an InMemory DB so I can run Postman tests against it.
I have a docker-compose that successfully starts it:
version: '3.9'
services:
api:
image: ${DOCKER_REGISTRY-}api-test
build:
context: ../
dockerfile: API/Dockerfile
ports:
- 80:80
- 443:443
environment:
- ASPNETCORE_ENVIRONMENT=Test
The test env is setup for the InMemory DB:
{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft.AspNetCore": "Warning"
}
},
"AllowedHosts": "*",
"UseOnlyInMemoryDatabase": true
}
I successfully configure the DB service in here:
namespace Infrastructure
{
public static class Dependencies
{
public static void ConfigureServices(IConfiguration configuration, IServiceCollection services)
{
var useOnlyInMemoryDatabase = false;
if (configuration["UseOnlyInMemoryDatabase"] != null)
{
useOnlyInMemoryDatabase = bool.Parse(configuration["UseOnlyInMemoryDatabase"]);
}
if (useOnlyInMemoryDatabase)
{
services.AddDbContext<BookDesinerContext>(c =>
c.UseInMemoryDatabase("BookDesignerDB"));
}
else
{
...
}
}
}
}
I get the successful log like this:
info: API[0]
PublicApi App created...
info: API[0]
Seeding Database...
Starting Seed Category
Ended Seeding and applying
warn: Microsoft.EntityFrameworkCore.Model.Validation[10620]
The property 'GameCell.Settings' is a collection or enumeration type with a value converter but with no value comparer. Set a value comparer to ensure the collection/enumeration elements are compared correctly.
info: Microsoft.EntityFrameworkCore.Infrastructure[10403]
Entity Framework Core 6.0.8 initialized 'BookDesinerContext' using provider 'Microsoft.EntityFrameworkCore.InMemory:6.0.7' with options: StoreName=BookDesignerDB
info: API[0]
LAUNCHING API
info: Microsoft.Hosting.Lifetime[14]
Now listening on: http://[::]:80
Notice the log from "Ended Seeding and Applying", which is set in OnModelCreating()
// Seed
builder.ApplyConfigurationsFromAssembly(Assembly.GetExecutingAssembly());
Console.WriteLine("Ended Seeding and applying");
All my configs seed data like this:
namespace Infrastructure.Data.Seeding
{
public class TagConfig : IEntityTypeConfiguration<Tag>
{
public void Configure(EntityTypeBuilder<Tag> builder)
{
builder.ToTable("Tag");
builder.Property(t => t.Value).IsRequired();
builder.HasData(
new Tag
{
TagId = 1,
Key = "Held",
Value = "Borja"
},
new Tag
{
TagId = 2,
Key = "Genre",
Value = "Pirat"
}
);
}
}
}
But when I access the collection under http://localhost/api/Tags I get []. I can use a REST client to create new resources and read them, but I want my seed data to be applied. Why does the config not apply the values from builder.HasData()?

Answer 1

For the seeding to actually happen, you need a call to:
context.Database.EnsureCreated();
Try:
services.GetRequiredService<BookDesinerContext>().Database.EnsureCreated();