LiteDB.Migration 0.0.9

LiteDB.Migration

LiteDB.Migration is a lightweight, easy-to-use library designed to facilitate schema migrations for LiteDB databases in .NET applications. It provides a structured way to evolve your database schema over time, ensuring that your application can safely and efficiently migrate data as your models change.

Features

• Flexible Migration Paths: Migrate data across multiple versions with ease.
• Simple API: Define your migrations using a simple API.
• Implicit and Explicit Migrations: Migrate all at once or in a Lazy way.

Getting Started

Installation

LiteDB.Migration is available as a NuGet package. You can install it via the NuGet Package Manager or the CLI:

dotnet add package LiteDB.Migration

Basic Usage

Get started by following the steps below. For a full example, see the Tests

1. Define Your Models: Start by defining your document models. For each version change that requires a migration, prepare a new version of the model.

// Original model
public class ModelV1
{
    public int Id { get; set; }
    public string OldProperty { get; set; }
}

// Updated model
public class ModelV2
{
    public int Id { get; set; }
    public string NewProperty { get; set; }
}

// Current model (Should always be ModelV[n])
public class Model
{
    public int Id { get; set; }
    public string NewProperty { get; set; }
}

2. Seed Data: Seed your database with the original model.

using (var db = new LiteDatabase("YourDatabase.db"))
{
    var collection = db.GetCollection<ModelV1>("YourCollectionName");
    collection.Insert(new ModelV1 { Id = 1, OldProperty = "Old" });
}

3. Define and apply Migrations: Define your migrations using the MigrationContainer class and apply them using the MigrationContainer class.

 // apply migration
using (var db = new LiteDatabase("YourDatabase.db"))
{
    var container = new MigrationContainer(config =>
    {
        config.Collection<Model>("modelA", x => x
            .WithMigrationStart<ModelV1>()
            .WithInlineMigration(model => new ModelV2
            {
                Id = model.Id,
                NewProperty = $"New-{model.OldProperty}"
            })
            // You can add more migrations here
        );
    });

    container.Apply(db);
}

4. Query Data: Query your database using the new model.

using (var db = new LiteDatabase("YourDatabase.db"))
{
    var collection = db.GetCollection<Model>("modelA");
    var result = collection.FindAll().First();
    Console.WriteLine(result.NewProperty); // Output: New-Old
}

Advanced Usage

For larger (enterprise) applications, you may want to use a more structured approach to migrations. In this case, you can use the please see the Full Example (Wiki page coming soon).

Contributing

Contributions are welcome! Feel free to submit pull requests, report issues, or suggest new features.

License

LiteDB.Migration is released under the MIT License. See the LICENSE file for more details.