如何引用seeds.rb中的图像

Question

我使用Carrierwave上传与我的用户模型关联的图像，该模型具有对应的picture属性，该属性在字符串字段中包含图像文件的名称。 通常，上传图片的名称存储在public/uploads 。
现在，我想用示例用户（包括个人资料图片的关联路径）为开发数据库添加种子。 我尝试将我的pic1.jpg ， pic2.jpg ， pic3.jpg图片存储在public/images并在db/seeds.rb引用这些图片作为picture: '/images/pic1.jpg' db/seeds.rb picture: '/images/pic1.jpg'等，就像Grant Neufeld在一个老的stackoverflow问题 。 在视图中，使用以下代码包含了图片：

<%= image_tag @user.picture.url if @user.picture? %>

但是，这不起作用，因为picture属性为nil，所以图像未加载到视图中。 我还尝试将我的图片存储在app/assets/images ，并将它们引用为db/seeds.rb picture: 'pic1.jpg' ， picture: 'pic2.jpg' ， picture: 'pic3.jpg' 。

以下是我的db/seeds.rb文件：

User.create!(name:  "Example User",
         email: "example@railstutorial.org",
         password:              "foobar",
         password_confirmation: "foobar",
         admin: true,
         politics: 'left',
         car: true,
         pets: 'I like horses and bears',
         music: 'American country and folk',
         picture: 'pic1.jpg',
         profile: 'I like music and the Ruby and Python programming languages',
         activated: true,
         activated_at: Time.zone.now)

User.create!(name:  "Super-friendly User",
        email: "example-101@railstutorial.org",
        password:              "PassWord-0",
        password_confirmation: "PassWord-0",
        admin: true,
        smoker: true,
        politics: 'left',
        car: true,
        pets: 'I like turtles and whales',
        car_pets: true,
        music: 'Jazz and blues',
        picture: 'pic2.jpg',
        profile: 'I like music and drinking',
        activated: true,
        activated_at: Time.zone.now)

User.create!(name:  "Friendly User",
        email: "example-102@railstutorial.org",
        password:              "PassWord-0",
        password_confirmation: "PassWord-0",
        politics: 'right',
        car: true,
        pets: 'I like snakes and gorillas',
        music: 'pop and classics',
        picture: 'pic3.jpg',
        profile: 'I like music and hiking',
        activated: true,
        activated_at: Time.zone.now)

99.times do |n|
  name  = Faker::Name.name
  email = "example-#{n+1}@railstutorial.org"
  password = "password"
  User.create!(name:  name,
           email: email,
           password:              password,
           password_confirmation: password,
           activated: true,
           activated_at: Time.zone.now)
end

Answer 1

假设您将图像保存在public/images ，那么Carrierwave要求您将IO对象传递给Rails模型，因此为了正确地在seeds.rb文件中进行设置，您需要执行以下操作：

User.create!(
  name:  "Example User",
  email: "example@railstutorial.org",
  password:              "foobar",
  password_confirmation: "foobar",
  admin: true,
  politics: 'left',
  car: true,
  pets: 'I like horses and bears',
  music: 'American country and folk',
  picture: File.open(Rails.root.join('public', 'images', 'pic1.jpg')),
  profile: 'I like music and the Ruby and Python programming languages',
  activated: true,
  activated_at: Time.zone.now
)

看到我已经将picture更改为File.open(Rails.root.join('public', 'images', 'pic1.jpg'))