Add Single Table Inheritance and a Tree Heirarchy to a model. See linked gist for an example of how to load data for a hierarchical table with STI https://gist.github.com/thenapking/3ccd4d20f3d9be74426ffa2354d44572

sti.rb

# models
class Location < ActiveRecord::Base
  has_ancestry cache_depth: true, touch: true, orphan_strategy: :destroy
  self.inheritance_column = :category

  def self.categories
  	%w(World Country Division Region Area Store)
  end 
  
  belongs_to :parent, class_name: "Location", foreign_key: "parent_id"
end 

# For each location category create a file with an empty class, eg 
class Store; end

# Now in the controllers use a variable called @klass to pick up the location category.

class LocationsController < ApplicationController
  
  before_action :set_location_category #STI

  def index
    @locations = @klass.constantize.all
  end
  
  def show
    @location = @klass.constantize.find(params[:location_id])
  end
  
  private
    def set_location_category
      #  if the location category is not recognised, make it a generic location.  You could also log the issue
      #  this is only an issue if you are syncing this table from an external data source
      @klass = Location.categories.include?(params[:category]) ? params[:category] : "Location"
    end
    
 end
 
 # In your views you can make a dynamic heading based on the location's category
 <h1><%= @klass.pluralize %></h1>