#648 ✓resolved
Greg Campbell

Potentially incorrect scope for STI uniqueness validation

Reported by Greg Campbell | November 10th, 2008 @ 06:29 PM | in 0.10.0


class Person
  include DataMapper::Resource
  property :id, Serial
  property :name, String, :unique => true

  property :type, Discriminator
end

class Man < Person; end
class Woman < Person; end

man = Man.new(:name => "Pat")
man.save

woman = Woman.new(:name => "Pat")
woman.valid? # => true

man2 = Man.new(:name => "Pat")
man2.valid? # => false

In my opinion, a uniqueness validation on a shared property specified at the level of the parent class ought to validate against the entire table for all child instances. The SQL for the uniqueness check here, however, looks like: SELECT id FROM people WHERE (type IN ('Woman')) AND (name = 'Pat') ORDER BY id LIMIT 1.

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