@invalid_attributes

{:company_size=>"200-500",
 :creator=>
  #<User id: 7525, email: "[email protected]", encrypted_password: "c017333d5105b87a8429648fd79233c2f0cc72ed", salt: "4c651fe5fab9102852419445f5b54282d583dcd2", token: "df6eddf5af9082b8eb9a93ecf998de24fcd186e3", token_expires_at: nil, email_confirmed: false>,
 :name=>"",
 :description=>"This is a great description.",
 :company_type=>"Private",
 :vision=>"I see the light!"}

company.rb

class Company < ActiveRecord::Base

  attr_writer :pass_validation

  COMPANY_SIZE_OPTIONS = %w(1-10 10-50 50-200 200-500 500-1000 1000-5000 5000-10000 10000_or_more)
  COMPANY_TYPE_OPTIONS = %w(public private non_profit government)

  belongs_to :creator, :class_name => "User", :foreign_key => "creator_user_id"
  has_many :job_posts, :dependent => :destroy

  has_and_belongs_to_many :uploaded_documents
  accepts_nested_attributes_for :uploaded_documents, :reject_if => proc { |a| a['uploaded_data'].blank? }
  
  has_and_belongs_to_many :uploaded_images

  validates_presence_of :creator, :name, :company_type, :company_size, :on => :create

  def logo
    self.uploaded_images.first
  end

  def logo=(p)
    self.uploaded_images.clear
    self.uploaded_images << p if p
  end
  
  def pass_validation?
    if self.pass_validation == true
      self.pass_validation = false
      true
    else
      false
    end
  end

  protected

  attr_reader :pass_validation

  def before_validation
    #cant be has_many :through; due to needing to allow other users to use this file
    self.uploaded_documents.each do |doc|
       doc.user = User.find(self.creator_user_id) if doc.user.nil?
    end
  end

  def presence_of_uploaded_image
    errors.add("uploaded_images", "only one is allowed") if self.uploaded_images.size > 1
  end
end

controller.rb

    def update
      @company = Company.find(params[:id])
      @company.update_attributes(params[:company])
      if @company.save
        flash[:notice] = t(:company_successfully_updated)
        redirect_to company_path(@company)
      else
        render :action => :edit, :id => @company.id
      end
    end

gistfile3.txt

  it "should error out when you leave name blank" do
    company = Company.create!(@valid_attributes)
    @invalid_attributes = @valid_attributes
    @invalid_attributes[:name] = ""
    @invalid_attributes[:company_size] = "200-500"
    @invalid_attributes[:company_type] = "Private"
    @invalid_attributes[:description] = "This is a great description."
    @invalid_attributes[:vision] = "I see the light!"
    company.attributes = @invalid_attributes
    company.valid?
    puts company.errors.collect &:to_s
    1.should == 2
  end