Association related validations seem to break on discriminator fields

[solnic]

http://gist.github.com/605956

I've posted a sample there. Notice how dog is valid without a human, but save fails.

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Created by pathsny (at gmail) - 2010-10-01 09:26:45 UTC

Original Lighthouse ticket: http://datamapper.lighthouseapp.com/projects/20609/tickets/1424

[emmanuel]

I'm pretty sure this is a consequence of Resource#valid? only reflecting the validity of the receiver (the current resource), whereas Resource#save is dependent on the validity of loaded related Resources (relationships set on the current resource).

In my opinion, the behavior of Resource#valid? should be synchronized with Resource#save (as implied by this issue), or a new method should be introduced to check the validity of the whole resource object graph (current resource and any loaded relationships), eg., Resource#all_valid?(context) or the like.

[costi]

I just encountered this problem myself.
I got a some specs to prove the broken behaviour.
First test passes, second one fails.

require 'rubygems'
require 'data_mapper'

DataMapper.setup(:default, 'sqlite::memory:')

class Address
  include DataMapper::Resource
  property :id, Serial
end

class Person
  include DataMapper::Resource
  property :id, Serial
  belongs_to :address
end

class Man < Person
end

DataMapper.auto_migrate!

describe 'person' do
  it 'requires address' do
    person = Person.new
    person.valid?
    person.errors[:address_id].should include("Address must not be blank")
  end
end

describe 'man' do
  it 'requires address' do
    man = Man.new
    man.valid?
    man.errors[:address_id].should include("Address must not be blank")
  end
end

[solnic]

@costi can you reproduce it with DM from master?