Validation

The Athena::Validator component adds a robust/flexible validation framework. This component is optional; to use it within the framework, add it to your shard.yml and register its bundle via require "athena-validator/bundle". It is then leveraged for the super useful ATHR::RequestBody resolver type to ensure only valid data make it into the system.

Custom Constraints

In addition to the general information for defining Custom Constraints, the validator component defines a specific type for defining service based constraint validators: AVD::ServiceConstraintValidator. This type should be inherited from instead of AVD::ConstraintValidator IF the validator for your custom constraint needs to be a service, E.x.

class Athena::Validator::Constraints::CustomConstraint < AVD::Constraint
  # ...

  @[ADI::Register]
  class Validator < AVD::ServiceConstraintValidator
    def initialize(...); end

    # :inherit:
    def validate(value : _, constraint : AVD::Constraints::CustomConstraint) : Nil
      # ...
    end
  end
end