validates_associated

customer.rb

class Customer < ActiveRecord::Base
  has_many :projects
  validates :name, :presence => true
  validates :cnpj, :presence => true, :format => { :with => /^\d{2}.?(\d{3}.?){2}\/\d{4}-?\d{2}$/ }
end

gistfile1.rb

Project
  is valid
    with valid attributes
  is not valid
    without a name
    without a customer (FAILED - 1)

Failures:

  1) Project is not valid without a customer
     Failure/Error: subject.save.should be_false
       expected true to be false
     # ./spec/models/project_spec.rb:25:in `block (3 levels) in <top (required)>'

Finished in 0.22772 seconds
3 examples, 1 failure

project.rb

class Project < ActiveRecord::Base
  belongs_to :customer
  validates :name, :presence => true
  # validates :customer, :presence => true
  validates_associated :customer  
end

project_spec.rb

require 'spec_helper'

describe Project do
  context "is valid" do
    subject do
      Project.new(name: "some name", customer: nil)
    end
    let(:customer){Factory(:customer)}

    it "with valid attributes" do
      # subject.customer = customer
      subject.customer = nil
      subject.save.should be_true
      # subject.should be_valid
    end
  end
  context "is not valid" do
    it "without a name" do
      subject.should_not be_valid
    end
    
    it "without a customer" do
      subject.name = "some other name"
      subject.customer = nil
      subject.save.should be_false
    end
  end
end