Rails has_many :通过关联问题

Question

我有一个包含三个模型的应用程序 - 用户、相册和评论。目前，评论是我的加入 table。一个用户有很多评论，通过评论有很多相册。一张专辑有很多评论，并且通过评论有很多用户。用户属于相册和评论。

我的问题是：有没有办法重新安排这些关联，使两个 has_many :through 关联在不同的模型上工作？因为我目前无法调用 album.user。它必须是 'album.users'，然后显示一长串与相册完全无关的用户。

我需要一个 has_many、一个 belongs_to 和两个 has_many：通过与这三个模型的关联。这甚至可能吗，还是我需要添加其他模型，例如流派或评论？

任何建议都有帮助，我会 post 下面是我的模型：

专辑

class Album < ApplicationRecord 
    has_many :reviews, :dependent => :destroy
    has_many :users, through: :reviews # incorrect
    has_one_attached :avatar
    accepts_nested_attributes_for :reviews
    validates_presence_of :artist
    validates_presence_of :title
    validate :unique_title_by_artist
    scope :with_recent_reviews, -> { includes(:reviews).where(reviews: { date: [(Date.today - 7.days)..Date.tomorrow] }) } 

    private

    def unique_title_by_artist
        if Album.where('lower(title) = ? AND artist = ?', self.title.downcase, self.artist).count > 0
          @errors.add(:title, "must be unique to artist")
        end
    end

end

class Review < ApplicationRecord
    belongs_to :album, optional: true
    belongs_to :user
    validates_presence_of :content
    validates :title, presence: true, uniqueness: true
    validates :date, presence: true
    accepts_nested_attributes_for :album
    scope :recent, -> { where("date(date) >= ?", Date.today - 7.days) } #scope for album
end

用户

require 'securerandom'
class User < ApplicationRecord
    has_secure_password
    validates :email, uniqueness: true, presence: true, format: { with: URI::MailTo::EMAIL_REGEXP }
    validates :name, uniqueness: true, length: {in: 3..20}, presence: true
    has_many :reviews
    has_many :albums, through: :reviews

    def self.from_omniauth(auth)
        where(provider: auth.provider, uid: auth.uid).first_or_initialize do |user|
          user.provider = auth.provider
          user.uid = auth.uid
          user.name = auth.info.name
          user.email = auth.info.email
          user.password = SecureRandom.urlsafe_base64
          user.oauth_token = auth.credentials.token
          user.oauth_expires_at = Time.at(auth.credentials.expires_at)
          user.save!
        end
      end

end

Answer 1

您可以将user_id（整数）添加到albums table，然后您可以跟踪相册的用户

在模型中添加

class Album < ApplicationRecord 
  has_many :reviews, :dependent => :destroy
  has_many :reviewers, through: :reviews, source: :user

  belongs_to :user
end


class User < ApplicationRecord
  has_many :reviews
  has_many :reviewed_albums, through: :reviews, source: :album

  has_many :albums
end

users 到 reviews 是 reviewers（评论相册的用户）

Rails has_many :通过关联问题

Rails has_many :through association issue

ruby-on-rails

associations

has-many-through