btrc-hub/backend/app/models/wiki_page.rb

require 'gollum-lib'


class WikiPage < ApplicationRecord
  WIKI_PATH = Rails.root.join('wiki').to_s

  belongs_to :tag, optional: true
  belongs_to :created_user, class_name: 'User', foreign_key: 'created_user_id'
  belongs_to :updated_user, class_name: 'User', foreign_key: 'updated_user_id'

  validates :title, presence: true, length: { maximum: 255 }, uniqueness: true

  def markdown
    wiki = Gollum::Wiki.new(WIKI_PATH)
    page = wiki.page(title)
    page&.raw_data
  end

  def markdown= content
    wiki = Gollum::Wiki.new(WIKI_PATH)

    page = wiki.page(title)

    commit_info = { message:  "Update #{ title }",
                    name:     current_user.id,
                    email:    'dummy@example.com' }

    if page
      page.update(content, commit: commit_info)
    else
      wiki.write_page(title, :markdown, content, commit_info)
    end
  end
end