Generate FluentValidation

Auto-generate FluentValidation validators from JD.Domain rule sets.

Goal

Create validators that mirror your invariants and validators without manual boilerplate.

Prerequisites

JD.Domain.FluentValidation.Generator
JD.Domain.Generators.Core
Microsoft.CodeAnalysis.CSharp
A DomainManifest that includes rule sets

Steps

1. Prepare a Manifest with Rules

using JD.Domain.Abstractions;
using JD.Domain.Rules;

var baseManifest = ECommerceManifest.GeneratedManifest;
var rules = new List<RuleSetManifest>
{
    new RuleSetBuilder<Customer>("Default")
        .Validator("Customer.Email.Required", c => !string.IsNullOrWhiteSpace(c.Email))
        .WithMessage("Email is required")
        .Build()
};

var manifest = new DomainManifest
{
    Name = baseManifest.Name,
    Version = baseManifest.Version,
    Entities = baseManifest.Entities,
    ValueObjects = baseManifest.ValueObjects,
    Enums = baseManifest.Enums,
    Configurations = baseManifest.Configurations,
    Sources = baseManifest.Sources,
    Metadata = baseManifest.Metadata,
    RuleSets = rules
};

2. Run the Generator Pipeline

using JD.Domain.FluentValidation.Generator;
using JD.Domain.Generators.Core;
using Microsoft.CodeAnalysis.CSharp;

var compilation = CSharpCompilation.Create("MyApp.Domain");
var context = new GeneratorContext
{
    Manifest = manifest,
    Compilation = compilation,
    CancellationToken = CancellationToken.None,
    Properties =
    {
        ["Namespace"] = "MyApp.Domain"
    }
};

var generator = new FluentValidationGenerator();
foreach (var file in generator.Generate(context))
{
    Directory.CreateDirectory("Generated");
    File.WriteAllText(Path.Combine("Generated", file.FileName), file.Content);
}

3. Include Generated Files

<ItemGroup>
  <Compile Include="Generated\**\*.g.cs" />
</ItemGroup>

4. Use the Validators

var validator = new CustomerDefaultValidator();
var result = validator.Validate(customer);

Result

Validators stay in sync with your JD.Domain rules and can be registered in DI like any FluentValidation validator.

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