Perform migration in the app host in local dev scenarios

- Add an executable resource if the database directory does not exist.

README.md

@@ -26,10 +26,8 @@ It showcases:
 1. [Install .NET 8](https://dotnet.microsoft.com/en-us/download/dotnet/8.0)
 
 ### Database
+
 1. Install the **dotnet-ef** tool: `dotnet tool install dotnet-ef -g`
-1. Navigate to the `TodoApi` folder.
-    1. Run `mkdir .db` to create the local database folder.
-    1. Run `dotnet ef database update` to create the database.
 1. Learn more about [dotnet-ef](https://learn.microsoft.com/en-us/ef/core/cli/dotnet)
 
 ### Running the application

TodoApi.AppHost/Program.cs

@@ -1,7 +1,15 @@
 var builder = DistributedApplication.CreateBuilder(args);
 
+var migrateOperation = builder.AddTodoDbMigration();
+
 var todoapi = builder.AddProject<Projects.TodoApi>("todoapi");
 
+if (migrateOperation is not null)
+{
+    // Wait for the migration to complete before running the api
+    todoapi.WaitForCompletion(migrateOperation);
+}
+
 builder.AddProject<Projects.Todo_Web_Server>("todo-web-server")
        .WithReference(todoapi);
 

TodoApi.AppHost/TodoApiEfMigrationsExtensions.cs

@@ -0,0 +1,31 @@
+internal static class TodoApiEfMigrationsExtensions
+{
+    public static IResourceBuilder<ExecutableResource>? AddTodoDbMigration(this IDistributedApplicationBuilder builder)
+    {
+        IResourceBuilder<ExecutableResource>? migrateOperation = default;
+
+        if (builder.ExecutionContext.IsRunMode)
+        {
+            var projectDirectory = Path.GetDirectoryName(new Projects.TodoApi().ProjectPath)!;
+            var dbDirectory = Path.Combine(projectDirectory, ".db");
+
+            if (!Directory.Exists(dbDirectory))
+            {
+                Directory.CreateDirectory(dbDirectory);
+
+                migrateOperation = builder.AddEfMigration<Projects.TodoApi>("todo-db-migration");
+            }
+        }
+
+        return migrateOperation;
+    }
+
+    public static IResourceBuilder<ExecutableResource> AddEfMigration<TProject>(this IDistributedApplicationBuilder builder, string name)
+        where TProject : IProjectMetadata, new()
+    {
+        var projectDirectory = Path.GetDirectoryName(new TProject().ProjectPath)!;
+
+        // TODO: Support passing a connection string
+        return builder.AddExecutable(name, "dotnet", projectDirectory, "ef", "database", "update", "--no-build");
+    }
+}