discourse/db/fixtures/999_topics.rb

User.reset_column_information
Topic.reset_column_information
Post.reset_column_information

staff = Category.find_by(id: SiteSetting.staff_category_id)
seed_welcome_topics = (Topic.where('id NOT IN (SELECT topic_id from categories where topic_id is not null)').count == 0 && !Rails.env.test?)

unless Rails.env.test?
  def create_static_page_topic(site_setting_key, title_key, body_key, body_override, category, description, params = {})
    unless SiteSetting.send(site_setting_key) > 0
      creator = PostCreator.new(Discourse.system_user,
                                 title: I18n.t(title_key, default: I18n.t(title_key, locale: :en)),
                                 raw: body_override.present? ? body_override : I18n.t(body_key, params.merge(default: I18n.t(body_key, params.merge(locale: :en)))),
                                 skip_validations: true,
                                 category: category ? category.name : nil)
      post = creator.create

      raise "Failed to create the #{description} topic! #{creator.errors.full_messages.join('. ')}" if creator.errors.present?

      SiteSetting.send("#{site_setting_key}=", post.topic_id)

      _reply = PostCreator.create(Discourse.system_user,
                                  raw: I18n.t('static_topic_first_reply', page_name: I18n.t(title_key, default: I18n.t(title_key, locale: :en))),
                                  skip_validations: true,
                                  topic_id: post.topic_id)
    end
  end

  create_static_page_topic('tos_topic_id', 'tos_topic.title', "tos_topic.body", nil, staff, "terms of service",     company_domain: "company_domain",
                                                                                                                    company_full_name: "company_full_name",
                                                                                                                    company_name: "company_short_name")

  create_static_page_topic('guidelines_topic_id', 'guidelines_topic.title', "guidelines_topic.body", nil, staff, "guidelines")

  create_static_page_topic('privacy_topic_id', 'privacy_topic.title', "privacy_topic.body", nil, staff, "privacy policy")
end

if seed_welcome_topics
  puts "Seeding welcome topics"

  PostCreator.create(Discourse.system_user, raw: I18n.t('assets_topic_body'), title: I18n.t('assets_topic_title'), skip_validations: true, category: staff ? staff.name : nil)

  post = PostCreator.create(Discourse.system_user, raw: I18n.t('discourse_welcome_topic.body'), title: I18n.t('discourse_welcome_topic.title'), skip_validations: true)
  post.topic.update_pinned(true, true)

  lounge = Category.find_by(id: SiteSetting.lounge_category_id)
  if lounge
    post = PostCreator.create(Discourse.system_user, raw: I18n.t('lounge_welcome.body'), title: I18n.t('lounge_welcome.title'), skip_validations: true, category: lounge.name)
    post.topic.update_pinned(true)
  end

  filename = DiscoursePluginRegistry.seed_data["admin_quick_start_filename"]
  if filename.nil? || !File.exists?(filename)
    filename = Rails.root + 'docs/ADMIN-QUICK-START-GUIDE.md'
  end

  welcome = File.read(filename)
  PostCreator.create(Discourse.system_user,
                      raw: welcome,
                      title: DiscoursePluginRegistry.seed_data["admin_quick_start_title"] || "READ ME FIRST: Admin Quick Start Guide",
                      skip_validations: true,
                      category: staff ? staff.name : nil)
end

# run this later, cause we need to make sure new application controller resilience is in place first

Migration::ColumnDropper.drop(
  table: 'user_stats',
  after_migration: 'DropUnreadTrackingColumns',
  columns: %w{
    first_topic_unread_at
  },
  on_drop: ->() {
    STDERR.puts "Removing superflous user stats columns!"
    ActiveRecord::Base.exec_sql "DROP FUNCTION IF EXISTS first_unread_topic_for(int)"
  }
)

Migration::ColumnDropper.drop(
  table: 'topics',
  after_migration: 'DropUnreadTrackingColumns',
  columns: %w{
    inappropriate_count
    bookmark_count
    off_topic_count
    illegal_count
    notify_user_count
    last_unread_at
  },
  on_drop: ->() {
    STDERR.puts "Removing superflous topic columns!"
  }
)

Migration::ColumnDropper.drop(
  table: 'topics',
  after_migration: 'RemoveAutoCloseColumnsFromTopics',
  columns: %w{
    auto_close_at
    auto_close_user_id
    auto_close_started_at
    auto_close_based_on_last_post
    auto_close_hours
  },
  on_drop: ->() {
    STDERR.puts "Removing superflous topic columns!"
  },
  delay: 3600
)