Dependency Injection¶

The Curiosity.Migrations library supports Dependency Injection (DI) to facilitate the creation and management of migration classes. This is primarily achieved through the CodeMigrationsProvider. This class is responsible for discovering and creating code migrations. It utilizes the IServiceCollection to register migration types, enabling the DI container to resolve and inject dependencies into migration classes.

Usage¶

To use DI with CodeMigrationsProvider, follow these steps:

Register Migration Classes: Use the CodeMigrationsProvider to register migration classes with the DI container. This allows the DI system to inject dependencies into these classes when they are instantiated.
```
var services = new ServiceCollection();
var provider = new CodeMigrationsProvider(services);
provider.FromAssembly(typeof(YourMigrationClass).Assembly);
```

Inject Dependencies: Define your migration classes to accept dependencies through their constructors. The DI container will automatically resolve and inject these dependencies when the migration is executed.

public class YourMigrationClass : CodeMigration
{
   private readonly IDependency _dependency;

   public YourMigrationClass(IDependency dependency)
   {
       _dependency = dependency;
   }

   public override Task UpgradeAsync(DbTransaction? transaction = null, CancellationToken cancellationToken = default)
   {
       // Use _dependency here
   }
}

Build and Run: Ensure that your DI container is properly configured and that the migration engine is built and executed as needed.