[Beginning Rails 6] Listing 6-18. The Updated User Model, has_many :through Declarations in app/models/user.rb

user.rb

class User < ApplicationRecord
  has_one :profile
  has_many :articles, -> { order 'published_at DESC, title ASC' },
           dependent: :nullify
  has_many :replies, through: :articles, source: :comments
end