Dynamic schema with Configurable's option/param

Support dry-validation
1

Hello,

I’ve been scratching my head for a couple hours but I can’t figure out how to do this:

require "dry-validation"

class MySchema < Dry::Validation::Contract
  option :sizes, default: -> { %w[small medium large] }

  params do
    required(:size).value(included_in?: sizes)
  end
end

# MySchema.new(sizes: %w[sm md lg])

I would like to do this because using Schema’s built-in predicates (included_in?) means I don’t have to write a custom rule or message for the value to be included in a dynamic list of things.

This is the correct version:

require "dry-validation"

class MySchema < Dry::Validation::Contract
  option :sizes, default: -> { %w[small medium large] }

  params do
    required(:size).value(:string)
  end

  rule(:size) do
    key.failure("invalid size") unless sizes.include?(value)
  end
end