创建一个模型 belongs_to 另一个 Rails 5

Question

这是我的图片模型：

class Image < ApplicationRecord
  belongs_to :user

  mount_uploader :avatar, AvatarUploader
end

我什至无法在没有用户的情况下在控制台中创建图像？这是从 Rails 4 开始改变的吗？

Image.create
   (0.1ms)  begin transaction
   (0.1ms)  rollback transaction
 => #<Image id: nil, user_id: nil, title: nil, created_at: nil, updated_at: nil, avatar: nil>
2.2.4 :018 > Image.create(title: "hi")
   (0.3ms)  begin transaction
   (0.1ms)  rollback transaction
 => #<Image id: nil, user_id: nil, title: "hi", created_at: nil, updated_at: nil, avatar: nil>
2.2.4 :019 > u = User.create
   (0.1ms)  begin transaction
  SQL (0.2ms)  INSERT INTO "users" ("created_at", "updated_at") VALUES (?, ?)  [["created_at", 2016-03-17 04:27:09 UTC], ["updated_at", 2016-03-17 04:27:09 UTC]]
   (8.6ms)  commit transaction
 => #<User id: 6, name: nil, created_at: "2016-03-17 04:27:09", updated_at: "2016-03-17 04:27:09">
2.2.4 :020 > u.images << Image.create
   (0.1ms)  begin transaction
   (0.0ms)  rollback transaction
   (0.0ms)  begin transaction
  SQL (0.3ms)  INSERT INTO "images" ("user_id", "created_at", "updated_at") VALUES (?, ?, ?)  [["user_id", 6], ["created_at", 2016-03-17 04:27:16 UTC], ["updated_at", 2016-03-17 04:27:16 UTC]]
   (7.8ms)  commit transaction
  Image Load (0.2ms)  SELECT "images".* FROM "images" WHERE "images"."user_id" = ?  [["user_id", 6]]
 => #<ActiveRecord::Associations::CollectionProxy [#<Image id: 3, user_id: 6, title: nil, created_at: "2016-03-17 04:27:16", updated_at: "2016-03-17 04:27:16", avatar: nil>]>

我无法设置我的工厂：

FactoryGirl.define do
  factory :user do
    sequence(:name) { |n| "jeff#{n}" }
    after(:build) do |user, eval|
      user.images << build(:image)
    end
  end


  factory :image do
    avatar File.open(File.join(Rails.root, '/spec/support/images/blueapron.jpg'))
  end
end

这些是我的错误消息：

* image - Validation failed: User must exist (ActiveRecord::RecordInvalid)
    from /Users/Jwan/.rvm/gems/ruby-2.2.4/gems/factory_girl-4.5.0/lib/factory_girl/linter.rb:4:in `lint!'
    from /Users/Jwan/.rvm/gems/ruby-2.2.4/gems/factory_girl-4.5.0/lib/factory_girl.rb:59:in `lint'
    from /Users/Jwan/Dropbox/programming/rails/carrierwave_s3/spec/support/factory_girl.rb:10:in `block (2

Answer 1

是的，它在 rails 中发生了变化 5. 如果您需要以前的行为，请将 optional: true 添加到 belongs_to 声明中。

创建一个模型 belongs_to 另一个 Rails 5

Create a model that belongs_to another in Rails 5

ruby-on-rails-5

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