ruby-on-rails - Rails : Cannot have a has_many :through association before association is defined

Question

将应用程序从Rails 4.2.9升级到Rails 5.2.1。

通过大部分令人讨厌的部分，更新了依赖关系和诸如此类的东西，最终使应用程序在console中运行，现在尝试访问server上的页面。加载了一些页面，但其他页面:

Cannot have a has_many :through association 'User#clubs' which goes through 'User#memberships' before the through association is defined.

不清楚在Rails 5中有哪些更改可以触发此操作？甚至不确定从哪里开始寻找。

有什么想法吗？

似乎无法在线调用，如下所示:

class ViewableStories
  ...
  def for_user
    Story
      .includes(:publications)
      .references(:publications)
      .where(
        stories[:user_id]
        .eq(@user.id)
        .or(
          publications[:club_id]
          .in(@user.club_ids)        <<==== execution halts
          .and(
            publications[:publish_on]
            .lt(Date.today)
            .or(publications[:publish_on].eq(nil))
          )
        )
      )
  end
end

从model/story.rb调用

  def self.viewable_published_stories_for(user)
    ViewableStories
      .for_user(user)
      .includes(:cover_image, :user, :table_of_contents)
      .published
      .chronological
  end

Answer 1

这可能只是模型中的订购问题。 has_many必须在has_many through之前。

因此，现在，您可能已经:

class User < ApplicationRecord
  ...
  has_many :clubs, through: :memberships
  has_many :memberships
  ...
end

您只需要将has_many :memberships移动到has_many through上方:

class User < ApplicationRecord
  ...
  has_many :memberships
  has_many :clubs, through: :memberships
  ...
end