validation-for-model-accepting-nested-attributes.rb

class CreateOrganizations < ActiveRecord::Migration
  def self.up
    create_table :organizations do |t|
    end
  end
end

class CreateChurches < ActiveRecord::Migration
  def self.up
    create_table :churches do |t|
      t.integer :organization_id
      t.string :name
    end
  end
end

class Organization < ActiveRecord::Base
  has_one :church
  accepts_nested_attributes_for :church
end

class Church < ActiveRecord::Base
  validates_presence_of :name
end

class OrganizationTest < ActiveSupport::TestCase
  test "should not be valid when associated church is not valid" do
    errors = ActiveRecord::Errors.new(:name => 'message')
    Church.any_instance.stubs(:errors).returns(errors)
    organization = Organization.new(:church_attributes => { :name => 'name' })
    assert !organization.valid?
  end
  test "should be valid when associated church is valid" do
    organization = Organization.new(:church_attributes => { :name => 'name' })
    assert organization.valid?
  end
end