Memoria

Validate commands

Memoria can run a validator over a command before it reaches its handler. If validation fails, the handler is not called and the dispatcher returns a Result whose Error.Details lists every failure.

This guide assumes you have FluentValidation registered — see Configuration: Validation.

Opt in per call

Validation is opt-in. Set validateCommand: true on any dispatcher method:

var result = await dispatcher.Send(command, validateCommand: true);
var result = await dispatcher.SendAndPublish(command, validateCommand: true);

For command sequences, use validateCommands: true on SendSequence.

What a validation failure looks like

{
    "IsSuccess": false,
    "Value": null,
    "Error": {
        "Message": "Validation failed",
        "Details": [
            "Name must not be empty",
            "Age must be greater than 0"
        ]
    }
}

Writing the validator

Use FluentValidation as you would in any other project:

public class CreateProductValidator : AbstractValidator<CreateProduct>
{
    public CreateProductValidator()
    {
        RuleFor(c => c.Name).NotEmpty();
    }
}

AddMemoriaFluentValidation(typeof(...)) scans the supplied assembly for AbstractValidator<> subclasses and registers them automatically.

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