[PATCH] validates_uniqueness_of should use values before cast

patch

now with gazillion adapters (untested)

Could someone create a 1.1.6 patch please?

Please use test/fixtures/db_definitions/schema.rb instead of tweaking every SQL file. The patch looks good, otherwise.

This doesn't apply because schema.rb only has the newest table definitions

I don't think this needs backporting to 1.1.6 and I don't like the private method call - but validations can be considered AR-internals I guess.

If the patch is OK please apply. I didn't see a proper place to stick an IP thing in the newest fixtures alas.

Tested with trunk, updated db_definitions/schema.rb according to bitsweat.

All tests passed, please apply, sure patch is ok.

Still applies cleanly, tests pass on mysql 5.0, postgresql 8.2, sqlite 2.8/3.4. +1

This fixes one scenario and breaks another. Consider

class Foo < ActiveRecord::Base
  validates_uniqueness_of :computed_attribute

  def computed_attribute
    # ...
  end
end

where read_attribute is not at play.

Ok now we are getting practical. What shalt I do? Downcast the thing returned by computed_attribute back into something the database can consume? That's possible unless there is something very intrinsic returned from the method. Isn't it proper to ask the user to define computed_value_before_cast or something of that senseif he needs that exact combination?