ActiveModel:FactoryGirl.rb

app_models_syllabus.rb

# app/models/syllabus.rb
class Syllabus
  include ActiveModel::Model

  attr_accessor :records, :academic_year, :course
  validates :academic_year, presence: true

  def initialize(academic_year, course = nil)
    @academic_year = academic_year
    @course = course
  end
end

app_models_syllabus_record.rb

# app/models/syllabus/record.rb
class Syllabus
  class Record
    attr_reader :format, :item, :contents, :course

    def initialize(format, course = nil)
      @format = format
      @item = item
      @course = course
      @contents = contents
    end
end

syllabus.rb

# ActiveModel Syllabus用 factory
# build専用　
# コンテンツなし　build(:syllabus)
# コンテンツあり　build(:syllabus, :has_content).build
FactoryGirl.define do
  factory :syllabus do
    academic_year factory: :academic_year, strategy: :build
    course factory: :course, strategy: :build
    initialize_with { new academic_year }
  end

  trait :has_content do
    after(:build) do |syllabus|
      records = create_list :syllabus_record, 5
    end
  end
end

syllabus_format.rb

FactoryGirl.define do
  factory :syllabus_format do
    association :academic_year, factory: :academic_year, strategy: :build
    association :syllabus_item, factory: :syllabus_item, strategy: :build
    display_order 1
    length 1
  end

  trait :with_content do
    after(:create) do |syllabus_format|
      create :syllabus_item
      create_list :syllabus_content, 5, syllabus_format: syllabus_format
    end
  end
end

syllabus_record.rb

# ActiveRecord Syllabus::Record用
# build専用　build(:syllabus_record)

FactoryGirl.define do
  factory :syllabus_record, class: Syllabus::Record do
    course factory: :course, strategy: :build
    initialize_with { new create(:syllabus_format, :with_content), course }
  end
end