Rails - main class, sub class, how to get all records with subclass

Question

In using STI, I'm trying to get all pages of a specific :type.

I have a main class in pages_controller.rb

class PagesController < ApplicationController

  def index
    @pages = Page.all
  end

end

Below that, I have another class in pages_controller.rb

class Blog < Page

    def index
        @pages = Blog.all   
    end

end

Shouldn't the Blog class get all pages with a :type of "Blog"? Instead it is getting all pages regardless of the type. I've also tried @pages = Page.where(:type => "Blog") I'm accessing the URL http://localhost:3000/blog

Here are my routes

    resources :pages do
        collection do
            get :gallery
            get :list
        end     
    end
    resources :blog, :controller => :pages

Answer 1

You need to define a class for every type in app/models directory:

# app/models/page.rb
class Page < ActiveRecord::Base
end

# app/models/blog.rb
class Blog < Page
end

If you want one controller to get them both:

if blog? # implement this method yourself
  @blogs = Blog.all
else
  @pages = Page.all
end

So in essence, the all-method returns instances of the class you called it on.

However: I would recommend you to use separate controller for each type. They are different resources and should be treaded as such. Use tools like InheritedResources to dry up your controllers.