Rails 4嵌套属性的ActiveModel验证(没有ActiveRecord)

Question

我正在开发一个小型Rails项目,它只允许用户提交表单,表单中的信息通过API调用发送到另一个服务进行消费.

这是我的模型:

class ServiceRequest
  include ActiveModel::Model
  include ActiveModel::Validations
  extend ActiveModel::Naming

  attr_accessor :first_name, :last_name, :prefix, :contact_email, :phone_number,
                :address, :address2, :city, :state, :zip_code, :country,
                :address_type, :troubleshooting_reference, :line_items

  validates_presence_of :first_name, :last_name, :contact_email, :phone_number,
                        :address, :city, :state, :zip_code, :country, :address_type,
                        :troubleshooting_reference

  def initialize(attributes = {})
    super
    @errors = ActiveModel::Errors.new(self)
    @api_response = nil
  end

  def line_items_attributes=(attributes)
    @line_items ||= []
    attributes.each do |i, params|
      @line_items.push(LineItem.new(params))
    end
  end

  def save
    conn = Faraday.new(url: "#{Figaro.env.arciplex_url}") do |faraday|
      faraday.request :url_encoded
      faraday.response :logger
      faraday.adapter  Faraday.default_adapter
    end

    @api_response = conn.post do |req|
      req.url "/api/v1/service_requests?token=#{Figaro.env.api_token}"
      req.headers['Content-Type'] = 'application/json'
      req.body = self.to_json
    end

    validate!
  end

  def validate!
    # If successful creation, do nothing
    unless [200, 201].include?(@api_response.status)
      Rails.logger.debug(@api_response.inspect)
      errors.add(:base, @api_response.body)
    else
      return @api_response.body
    end
  end

end

这是我的LineItem模型:

class LineItem
  include ActiveModel::Model
  include ActiveModel::Validations

  attr_accessor :item_type, :model_number, :serial_number, :additional_information

  validates_presence_of :item_type, :model_number, :serial_number
end

我正在测试表单,并且如果用户提交表单而没有提供表单,我试图让表单失败:model_number但是ServiceRequest对象认为它valid?不是检查LineItem验证.

无论如何,当我@service_request.valid?在我的控制器中运行时包括这些验证？