DummyDataExtensions.cs

using LinkDotNet.Blog.Infrastructure.Persistence;
using LinkDotNet.Blog.Infrastructure.Persistence.Sql;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Linq;

namespace LinkDotNet.Blog.Web.Features.DummyData;

public static class DummyDataExtensions
{
    /// <summary>
    /// This will seed some blog post data and replace the connection to the real database with an in-memory database with dummy data.
    /// Use this for testing or development purposes only.
    /// </summary>
    public static void UseDummyData(this IServiceCollection services, DummyDataOptions? options = null)
    {
        ArgumentNullException.ThrowIfNull(services);

        var descriptors = services.Where(d => d.ServiceType == typeof(IRepository<>)).ToList();
        foreach (var descriptor in descriptors)
        {
            services.Remove(descriptor);
        }

        var dummyDataOptions = options ?? new DummyDataOptions();

        services.AddPooledDbContextFactory<BlogDbContext>(builder =>
        {
            builder.UseSqlite("DataSource=file::memory:?cache=shared")
#if DEBUG
                .EnableDetailedErrors()
#endif
                ;
        });

        services.AddScoped(typeof(IRepository<>), typeof(Repository<>));

        services.AddSingleton(dummyDataOptions);
        services.AddHostedService<DummyDataSeeder>();
    }
}