belongs_to_validation_with_ar_vs_dm.rb

require 'active_record'

require 'dm-core'
require 'dm-mysql-adapter'
require 'dm-migrations'
require 'dm-validations'

DataMapper.setup :default, "mysql://localhost/tests"

module DM
  class Group
    include DataMapper::Resource

    storage_names[:default] = "groups"
    
    property :id,   Serial
    property :name, String
    
    has n, :students
  end
  
  class Student
    include DataMapper::Resource

    storage_names[:default] = "students"
    
    property :id, Serial
    property :name, String
    
    belongs_to :group
  end
end

DataMapper.auto_migrate!

ActiveRecord::Base.establish_connection :adapter => "mysql", :database => "tests"

module AR
  class Group < ActiveRecord::Base
    set_table_name "groups"
    has_many :students
  end

  class Student < ActiveRecord::Base
    set_table_name "students"
    belongs_to :group
  end
end

ar_student = AR::Student.create :group_id => 'foo'
dm_student = DM::Student.create :group_id => 'foo'

puts "ar_student errors: #{ar_student.errors.inspect}" # => {}
puts "dm_student errors: #{dm_student.errors.inspect}" # => #<DataMapper::Validations::ValidationErrors:0x8df30d8 @resource=#<DM::Student @id=nil @name=nil @group_id="foo">, @errors={:group_id=>["Group must be an integer"]}>

True dat.