mapknitter/app/controllers/users_controller.rb

class UsersController < ApplicationController
  helper_method :sort_column, :sort_direction

  def profile
    params[:id] = current_user.login if logged_in? && params[:id].empty?
    @user = User.find_by_login(params[:id])
    @maps = Map.where(user_id: @user.id)
               .paginate(page: params[:page], per_page: 24)
  end

  def index
    @title = 'Prolific map authors'
    @users = User.joins(:maps)
                 .select('users.*, count(users.id) as maps_count')
                 .group('maps.user_id')
                 .order(sort_column + ' ' + sort_direction)
                 .paginate(page: params[:page], per_page: 24)
    render('users/index')
  end

  private

  def sort_column
    params[:sort] || 'maps_count'
  end

  def sort_direction
    params[:direction] || 'desc'
  end

  def user_params
    params.require(:user).permit(:login, :email, :name,
      :password, :password_confirmation)
  end
end