Remarkable Macros for Foreign Keys

[hosh]

Implement Remarkable Macros for Foreign keys

describe Model do
  describe "when working with schema" do
    it { should have_reference_to :collections }
    it { should have_foreign_key_constraint_to :collections, :name => 'blah' }
  end
end

Some alternatives:

it { should reference :collection }
it { should constrain_foreign_key_to :collection }

Will need to figure out some good semantics and syntax.