JsonSchema.rb

json_schema.rb

# app/schemas/credit_card_params_schema.json
{
  "id": "//credit_card_params_schema",
  "type": "object",
  "properties": {
    "holder_name": { "type": "string" },
    "number": { "type": "string" },
    "brand": { "type": "string" },
    "month": { "type": "string" },
    "year": { "type": "string" },
    "verification_value": { "type": "string" },
    "gateway_name": { "type": "string", "format": "gateway_name" }
  }
}

# app/controllers/v1/credit_cards/models_controller.rb

def secure
  credit_card_params.validate!(:credit_card_params_schema)
  ...
end

private

def credit_card_params
  params.require(:credit_card).permit!
end

# config/initializers/json_schema.rb

[Hash, ActiveSupport::HashWithIndifferentAccess, ActionController::Parameters].each do |klass|
  klass.class_eval do
    def validate!(schema)
      schema = JSON.parse(File.read(Rails.root.join('app', 'schemas', "#{schema}.json")), symbolize_names: true)
      h = self.to_h

      errors = JSON::Validator.fully_validate(schema, h, strict: true)
      raise JSONValidatorError, errors unless errors.empty?
      h
    end
  end
end
...