It's this a bug in rails? about single table inheritance;

Question

---

class Parent < ActiveRecord::Base
end

class Sub < Parent
end

class SubSub < Sub
end

---

>> SubSub.create :name => 'name1'
>> SubSub.create :name => 'name2'
>> SubSub.create :name => 'name3'

---

Then

---

>> SubSub.all.map{|x| x.name}    # => ['name1', 'name2', 'name3']
>> Sub.all.map {|x| x.name}      # => []  # I was expected that it will show all items;
>> Parent.all.map { |x| x.name}  # => ['name1', 'name2', 'name3']

---

I need Sub.all to show all its subclass's items, how to make it? It's this a bug?

---

I tested again, and it did work when there is no 'type' column specified in the table, but fails when with the 'type' column.

---

There is just one table named 'parents' with 'type' column;

---

My Env: rails-3.0.0.beta3, ruby-1.9.2-pre

Answer 1

Sub.all DOES show all its subclass' items. I suggest you check your code. DEFINITELY not a bug.