Web Api layout

design/InkForge.Migrations/MigratingDbContextFactory.cs

@@ -0,0 +1,32 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+
+namespace InkForge.Migrations;
+
+public abstract class MigratingDbContextFactory<T> : IDesignTimeDbContextFactory<T>
+	where T : DbContext
+{
+	public T CreateDbContext(string[] args)
+	{
+		var configuration = new ConfigurationBuilder()
+			.AddCommandLine(args)
+			.Build();
+
+		var options = new DbContextOptionsBuilder<T>();
+		switch (configuration.GetValue<string>("DbProvider"))
+		{
+			case null:
+				throw new Exception("DbProvider not set.");
+
+			case { } provider:
+				Configure(options, configuration.GetConnectionString("DefaultConnection")!, provider);
+				break;
+		}
+
+		return CreateDbContext(options.Options);
+	}
+
+	protected abstract void Configure(DbContextOptionsBuilder<T> optionsBuilder, string connectionString, string provider);
+
+	protected abstract T CreateDbContext(DbContextOptions<T> options);
+}