如何在Rails模型中验证字符串是否为json

class MyModel< ApplicationRecord
  validates :data, json: true
end

class MyModel< ApplicationRecord
  validate :json_contains_required_keys

  def json_contains_required_keys
    required_keys = ['key1', 'key2']
    parsed_data = JSON.parse(data)
    missing_keys = required_keys - parsed_data.keys

    if missing_keys.any?
      errors.add(:data, "is missing required keys: #{missing_keys.join(', ')}")
    end
  rescue JSON::ParserError
    errors.add(:data, 'is not a valid JSON')
  end
end