You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: settings_form_validator.rb
    path of file: ./repos/rails-settings-ui/lib/rails-settings-ui
    
    the code of the file until where you have to start completion: require 'i18n'
require 'dry-validation'

module RailsSettingsUi
  module CustomPredicates
    include Dry::Logic::Predicates

    predicate(:form_hash?) do |value|
      begin
        JSON.parse(value.gsub(/\=\>/, ':'))
 
    
    def build_validation_schema
      registry = Dry::Validation::PredicateRegistry.new(CustomPredicates)
      v = Dry::Validation::Schema::Value.new(registry: registry)

      validatable_settings.each do |name, value|
        predicate = VALIDATABLE_TYPES[value.class]
        v.required(name.to_sym).filled(predicate) if predicate
      end

      SettingsSchema.configure do |config|
        config.rules = v.rules
        config.messages = :i18n
      end

      @schema = SettingsSchema.new
    end