How to handle database migrations with LiteDB.FSharp?

LiteDB.FSharp does not provide built-in migration tools; since LiteDB is schema-less, you need to manage schema changes manually in your F# code or use LiteDB's native document update features, which can be error-prone for complex evolutions.

Can LiteDB.FSharp be used with ASP.NET Core in F#?

Yes, it integrates well by setting up the LiteDatabase instance with FSharpBsonMapper in the startup configuration, similar to other .NET services, making it suitable for lightweight web applications with local data storage.

What are the limitations of LiteDB.FSharp with inheritance?

Inheritance requires global registration of types and mutable fields, and the library uses field name matching for deserialization, which can break if inherited types have different field names, as warned in the README examples.

How to query nested discriminated unions in LiteDB.FSharp?

Use the `Query.Where` method with `Bson.deserializeField` to deserialize and pattern-match nested DUs, as shown in the Shape example with Composite types, though this adds runtime complexity.

LiteDB.FSharp vs Entity Framework Core for F# – which is better?

LiteDB.FSharp is best for embedded, NoSQL scenarios with strong F# type safety, while Entity Framework Core suits relational databases with ORM features; choose based on data model (NoSQL vs. SQL) and scalability needs.

How to set up auto-increment IDs in LiteDB.FSharp?

Apply the `CLIMutableAttribute` to your record type and initialize the `Id` field to 0; LiteDB.FSharp will handle auto-incrementing, as demonstrated in the album example, but this requires mutable records.

Open-Awesome

LiteDB.FSharp

MITF#

F# serialization and type-safe query support for LiteDB, enabling seamless use of F# records, unions, and maps.

GitHub

185 stars20 forks0 contributors

What is LiteDB.FSharp?

LiteDB.FSharp is an F# library that adds advanced serialization and type-safe query capabilities to LiteDB, an embedded NoSQL database for .NET. It enables F# developers to work with native F# types like records and discriminated unions while providing compile-time-safe query expressions through F# quotations. The library solves the problem of integrating LiteDB seamlessly into F# applications without sacrificing type safety or idiomatic F# design.

Target Audience

F# developers building .NET applications that require a lightweight, embedded NoSQL database with strong type safety and functional programming patterns.

Value Proposition

Developers choose LiteDB.FSharp because it provides a type-safe, idiomatic F# interface to LiteDB, eliminating the need for manual serialization/deserialization and enabling compile-time-verified queries. Its integration with F# quotations and support for complex F# types make it uniquely suited for functional .NET projects.

Overview

Advanced F# Support for LiteDB, an embedded NoSql database for .NET with type-safe query expression through F# quotations

Use Cases

Best For

F# applications needing an embedded NoSQL database with type-safe queries
Projects using discriminated unions and records as persistent documents
Developers wanting compile-time-safe database queries via F# quotations
Functional .NET codebases requiring seamless serialization of F# types
Lightweight desktop or mobile apps with local data storage in F#
Prototyping or small-scale applications with minimal database setup

Not Ideal For

Projects requiring the latest LiteDB v5 features immediately
Applications with high-scale performance demands or complex migrations
Teams using C# or mixed-language codebases without F# integration
Scenarios needing strict ACID transactions or relational data integrity

Pros & Cons

Pros

Type-Safe Query Expressions

Uses F# quotations for compile-time verification, reducing runtime errors and enhancing IntelliSense, as shown in examples like `albums.findOne <@ fun album -> album.Id = 1 @>`.

Native F# Type Serialization

Supports F# records, discriminated unions, and maps with a custom BsonMapper, eliminating manual conversion for persistent documents like the Album type.

Automatic Primary Key Mapping

Maps `Id` or `id` fields to `_id` automatically, simplifying document design and indexing without extra configuration.

Complex Type Handling

Handles nested discriminated unions and inheritance hierarchies, enabling rich domain modeling with examples like the Shape type and Composite patterns.

Cons

Limited LiteDB Version Support

Currently supports LiteDB 4.14 to >5.0, with v5 support being a work in progress, potentially delaying adoption for projects on the latest database version.

Complex Inheritance Configuration

Requires global type registration with `FSharpBsonMapper.RegisterInheritedConverterType` and mutable fields, adding boilerplate and risk of misconfiguration, as detailed in the README.

Performance Overhead

The additional serialization layer for F# types might introduce overhead compared to raw LiteDB usage, especially for deeply nested or complex data structures.

Frequently Asked Questions

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