EN FluentValidation

FluentValidation

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Offside.FluentValidation turns FluentValidation failures into Offside Error values. It does not know about HTTP.

dotnet add package Offside.FluentValidation

Targets: netstandard2.0, net8.0, net10.0.

Mapping

FluentValidation	Offside
.WithErrorCode("email.taken")	Error.Code (catalog key)
Default NotEmptyValidator (and other *Validator names)	code = validation
PropertyName	Field (null when empty)
AttemptedValue	Arguments["attemptedValue"]
—	Error.ErrorCode = VALIDATION
ErrorMessage	discarded; the Offside catalog supplies the text

RuleFor(x => x.Email).NotEmpty().WithErrorCode("email.required");

var result = validator.Validate(request).ToResult();

Also: failures.ToOffsideErrors(), validationResult.ToOffsideErrors(), exception.ToOffsideErrors().

Add the same key to errors.json:

{ "email.required": "Email is required." }

FastEndpoints hosts should use Offside.FastEndpoint instead of calling this from an endpoint by hand — that package already runs the mapper in the error pipeline.