Question

我正在学习rails，当我运行rake db：seed时注意到了这个问题。老实说，我不确定问题是什么，因为一切似乎运行良好，所有的关联似乎也在起作用。

错误讯息：

<string><space><string><tab><number><tab><number><tab>...

这是我种子的一个例子：

rake aborted! ActiveRecord::HasManyThroughSourceAssociationNotFoundError: Could not find the source association(s) "author" or :author in model Post. Try 'has_many :author, :through => :post, :source => <name>'. Is it one of user, category, comments, comment_users, likes, or like_users?
/home/houtai/hr.glass/ourz/db/seeds.rb:102:in `<top (required)>'
Tasks: TOP => db:seed

以下是我的协会：

User.create!({
  first_name: 'Mark',
  last_name: 'Wong',
  bio: 'bla',
  email: 'mark@gmail.com',
  password: 'test',
  password_confirmation: 'test',
  profile_pic: 'http://houtaiwong.com/img/profile.jpg'
  })

User.create!({
  first_name: 'Hou',
  last_name: 'Wong',
  bio: 'bla',
  email: 'test@gmail.com',
  password: 'test',
  password_confirmation: 'test',
  profile_pic: 'https://pmcdeadline2.files.wordpress.com/2016/02/alicia-vikander-the-danish-girl.jpg'
})

Category.create!({
  name: 'Music'
})

Category.create!({
  name: 'Blog'
})

Category.create!({
  name: 'Video'
})

Category.create!({
  name: 'Picture'
  })

Post.create!({
  title: 'Music',
  content: 'text',
  author: User.find_by(first_name: 'Mark').id,
  category_id: Category.find_by(name: 'Music').id,
  end_time: '12/1/2016',
  image: 'https://pmcdeadline2.files.wordpress.com/2016/02/alicia-vikander-the-danish-girl.jpg'
})

发表：

class User < ActiveRecord::Base
  authenticates_with_sorcery!

  # attr_accessor :remote_image_url, :first_name, :last_name, :bio, :emaily, :profile_pic

  validates :password, length: { minimum: 3 }, if: -> { new_record? || changes[:crypted_password] }
  validates :password, confirmation: true, if: -> { new_record? || changes[:crypted_password] }
  validates :password_confirmation, presence: true, if: -> { new_record? || changes[:crypted_password] }

  validates :email, uniqueness: true

  has_many :posts, foreign_key: :author

  has_many :active_relationships,  class_name:  "Relationship",
                                   foreign_key: "follower_id",
                                   dependent:   :destroy
  has_many :passive_relationships, class_name:  "Relationship",
                                   foreign_key: "followed_id",
                                   dependent:   :destroy
  has_many :following, through: :active_relationships,  source: :followed
  has_many :followers, through: :passive_relationships, source: :follower

  has_many :comments
  has_many :comment_posts, through: :comments, source: 'post'

  has_many :likes
  has_many :like_posts, through: :likes, source: 'post'

Answer 1

在Post模型的关系中，你有：

belongs_to :user, foreign_key: :author

这意味着rails关系是用户而非作者，但因为您将foreign_key设置为author，当ActiveRecord在数据库中查找时，它将使用author_id字段。

所以在你的种子里：

Post.create!({
  title: 'Music',
  content: 'text',
  author: User.find_by(first_name: 'Mark').id,
  category_id: Category.find_by(name: 'Music').id,
  end_time: '12/1/2016',
  image: 'https://pmcdeadline2.files.wordpress.com/2016/02/alicia-vikander-the-danish-girl.jpg'
})

作者密钥将无法识别，因为您已将该关系声明为用户。

两种可能的解决方案是将种子改为：

Post.create!({
  title: 'Music',
  content: 'text',
  user: User.find_by(first_name: 'Mark').id,
  category_id: Category.find_by(name: 'Music').id,
  end_time: '12/1/2016',
  image: 'https://pmcdeadline2.files.wordpress.com/2016/02/alicia-vikander-the-danish-girl.jpg'
})

或将您在Post中的关系更改为：

belongs_to :author, class_name: 'User'

这应解决Could not find the source association(s) "author" or :author in model Post部分，但是你有很多关系，并且通过表格进行，可能需要更多信息才能全面了解。

Rails Active Record有很多关联错误

1 个答案: