Hanami validations using an optional array with Hashs in it.

search_form.rb

require 'hanami/validations/form'

class SearchForm
  include Hanami::Validations::Form
  
  validations do
    optional(:filter).maybe do
      schema do
        optional(:category).each do
          schema do
            required(:name) { filled? & str? }
          end
        end
      end
    end
  end
end