btrc-hub/backend/app/controllers/wiki_pages_controller.rb

class WikiPagesController < ApplicationController
  def show
    wiki_page = WikiPage.find(params[:id])
    render json: wiki_page.as_json
  end

  def show_by_title
    wiki_page = WikiPage.find_by(title: params[:title])
    body = wiki_page&.body
    return head :not_found unless body

    render plain: body
  end

  def create
    return head :unauthorized unless current_user
    return head :forbidden unless ['admin', 'member'].include?(current_user.role)

    wiki_page = WikiPage.new(title: params[:title], created_user: current_user, updated_user: current_user)
    if wiki_page.save
      wiki_page.set_body params[:body], user: current_user
      render json: wiki_page, status: :created
    else
      render json: { errors: wiki_page.errors.full_messages }, status: :unprocessable_entity
    end
  end

  def update
    return head :unauthorized unless current_user

    wiki_page = WikiPage.find(params[:id])
    return head :not_found unless wiki_pages

    wiki_page.updated_user = current_user
    wiki_page.set_body params[:body], user: current_user
    wiki_page.save!
    head :ok
  end
end