cheat sheets.

Remarkable ActiveRecord Macros

    should_belong_to :user
    should_have_many :comments
    should_have_and_belong_to_many :tags

    should_validate_presence_of :body
    should_validate_uniqueness_of :title, :allow_blank => true

For those who likes more the Rspec way can simply do:

    it { should belong_to(:user) }
    it { should have_many(:comments) }
    it { should have_and_belong_to_many(:tags) }

    it { should validate_presence_of(:body) }
    it { should validate_uniqueness_of(:title, :allow_blank => true) }

Other matchers:

	accept_nested_attributes_for
	allow_mass_assignment_of
	allow_values_for
	have_column	
	have_default_scope
	have_index
	have_one
	have_readonly_attribute
	have_scope
	validate_acceptance_of
	validate_associated
	validate_confirmation_of
	validate_exclusion_of
	validate_format_of
	validate_inclusion_of
	validate_length_of
	validate_numericality_of