Strict STI?

Rails
1

Is there a way to set the base class to abstract? or otherwise enforce
that no one can create a “Pet”?

Pet < ActiveRecord
Dog < Pet
Pig < Pet

I’ve tried:

class Pet < ActiveRecord::Base
validates_presence_of :type
end

but I get an error about
…/vendor/rails/activerecord/lib/active_record/validations.rb:74:
warning: Object#type is deprecated; use Object#class

2

Chris.Mohr wrote:

validates_presence_of :type
end

but I get an error about
…/vendor/rails/activerecord/lib/active_record/validations.rb:74:
warning: Object#type is deprecated; use Object#class

There may be other (better) ways but the way I’ve done it is:

def validate
errors.add_to_base “You can not have an item of the base class,
Pet” unless self.class != Pet
end

CT

3

On Dec 02, 2006, at 11:13 pm, Chris.Mohr wrote:

validates_presence_of :type
end

Chris,

Try this (untested and completely hypothetical):

class Pet < ActiveRecord::Base
elf.abstract_class = true
end

Off the top of my head, I don’t know what happens if you try and
instantiate one of these though.

Ashley