Question

I have two models, Article and Recipe, which have a bunch of the same attributes and methods. I want to make the subclasses of a new class “Post” and move all their shared logic in there so I’m not maintaining duplicate code. I’ve tried this:

class Recipe < Post; end
class Article < Post; end
class Post < ActiveRecord::Base
     #all the shared logic
end

All of these classes are in the standard ./app/models folder. This code, however, throws a ActiveRecord::StatementInvalid error when I go to /articles/new, for instance. The error is:

Could not find table ‘posts’

Any idea how to set this up?

Answer 1

Why don’t you use modules?

module Features
  def hello
    p "hello"
  end
end

class Recipe < ActiveRecord::Base
  include Features
end

class Article < ActiveRecord::Base
  include Features
end


Recipe.new.hello
# => "hello"

Article.new.hello
# => "hello"