小编mar*_*rie的帖子

我是工厂新手，我需要关联和嵌套属性的帮助......

• 如何设置创建产品的管理员用户？好的
• 如何为产品设置类别？好的

• 如何将图像附加到产品上？好的

• 如何设置产品的尺寸（嵌套属性）

用户.rb

 has_many :products

产品.rb

belongs_to :user
belongs_to :category
has_many :sizes, inverse_of: :product, dependent: :destroy #nested_attributes 

大小.rb

belongs_to :product

类别.rb

has_many :products

工厂/用户.rb

  FactoryBot.define do
    factory :user do 
        first_name        { Faker::Name.first_name}
        last_name         { Faker::Name.last_name }
        admin             { [false, true].sample }
        sequence(:email)  { |n| "#{n}#{Faker::Internet.email}" }
        birth_date        {"20/10/1997"}
        password          { 'password'}
    end 
  end

工厂/类别.rb

FactoryBot.define do
  factory :category do
    title { Faker::Artist.name }
  end
end

工厂/尺寸.rb

FactoryBot.define do 
    factory :size do 
        size_name {["S", "M", "L", "XL"].sample } …

It seems that this two pieces of codes do the same job, but I would like to understand why I'd rather use one or another

First example:

module MyModule 
  extend self

  def first_method
  end

  def second_method
  end

end

Second example:

module MyModule 

  def self.first_method
  end

  def self.second_method
  end

end