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

class DeerjikistsController < ApplicationController
  def show
    platform = params[:platform].to_s.strip
    code = params[:code].to_s.strip
    return head :bad_request if platform.blank? || code.blank?

    deerjikist = Deerjikist
                 .joins(:tag)
                 .includes(:tag, tag: :tag_name)
                 .find_by(platform:, code:)
    if deerjikist
      render json: DeerjikistRepr.base(deerjikist)
    else
      head :not_found
    end
  end
end