validation-strategies.md

Validation strategies

This library supports strongly typed FluentValidation.ValidationStrategy configuration

• By default ValidationDefaults.ValidationStrategies.Default is used. It is doing nothing with validation rules
• Validation strategies can be configured only on arguments directly
• Validation strategies is not supporting attribute-based approach out of the box for now

descriptor.Field(x => x.Example(default!))
  .Argument("input", argument => argument.UseFluentValidation(...))

To configure validation strategy use UseValidator/s with two generic parameter overloads (because you need to know not only TValidator, but TInput itself to use with ValidationStrategy<TInput> for strongly typed suggestions)

descriptor.Field(x => x.Example(default!))
  .Argument("input", argument => argument.UseFluentValidation(options =>
  {
    // ValidationStrategy<Example>
    options.UseValidator<Example, ExampleInput>(strategy =>
    {
      strategy.IncludeProperties(input => input.ExampleProperty);
    });
  })))

Dynamic validation strategy

descriptor.Field(x => x.Example(default!))
  .Argument("input", argument => argument.UseFluentValidation(options =>
  {
    // ValidationStrategy<Example>
    options.UseValidationStrategy<Example>((context, strategy) =>
    {
      var strategyService = context.MiddlewareContext.Service<IStrategyService>();

      if (strategyService.ShouldIncludeExampleProperty())
      {
        strategy.IncludeProperties(input => input.ExampleProperty);
      }
    });
  })))

Dynamic validation strategy with custom input validator

descriptor.Field(x => x.Example(default!))
  .Argument("input", argument => argument.UseFluentValidation(options =>
  {
    // ValidationStrategy<Example>
    options.UseValidator<Example, ExampleInput>((context, strategy) =>
    {
      var strategyService = context.MiddlewareContext.Service<IStrategyService>();

      if (strategyService.ShouldIncludeExampleProperty())
      {
        strategy.IncludeProperties(input => input.ExampleProperty);
      }
    });
  })))

Read more on FluentValidation site https://docs.fluentvalidation.net/en/latest/rulesets.html