Degree name uniqueness

app/models/degree.rb

@@ -4,5 +4,6 @@ class Degree < BaseModel
   def validate
     validates_presence :university_id, :message => "Uczelnia jest wymagana"
     validates_presence :name, :message => "Nazwa jest wymagana"
+    validates_unique   :name, :message => "Nazwa jest już zajęta"
   end
 end

test/models/degree_test.rb

@@ -14,4 +14,13 @@ def test_name_cannot_be_empty
       degree.name = ""
     end
   end
+
+  def test_name_must_be_unique
+    name = "unique333"
+    Degree.make(:name => name)
+    degree = Degree.make
+    assert_invalid(degree, :name, "Nazwa jest już zajęta") do
+      degree.name = name
+    end
+  end
 end