Adding custom validations for watchers

lib/noah/validations.rb

+require File.join(File.dirname(__FILE__), 'validations','watcher_validations')

lib/noah/validations/watcher_validations.rb

+module Noah
+  module WatcherValidations
+
+      def assert_not_subset(error = [:pattern, :already_provided])
+        self.instance_of?(Noah::Watcher) ? (assert endpoint_covered?, error) : (assert false, "Validation not applicable")
+      end
+
+      def assert_not_superset(error = [:pattern, :replaces_existing])
+        self.instance_of?(Noah::Watcher) ? (assert endpoint_overrides?, error) : (assert false, "Validation not applicable")
+      end
+
+      private
+      def endpoint_covered?
+        watches = Watcher.all.find(:endpoint => self.endpoint).sort
+        watches.each do |w|
+          if (w.pattern.size < self.pattern.size) && self.pattern.match(/^#{w.pattern}/)
+            return false
+          end
+        end
+      rescue ArgumentError
+        return false
+      end
+
+      def endpoint_overrides?
+        watches = Watcher.all.find(:endpoint => self.endpoint).sort
+        watches.each do |w|
+          if (w.pattern.size > self.pattern.size) && w.pattern.match(/^#{self.pattern}/)
+            return false
+          end
+        end
+      rescue ArgumentError
+        return false
+      end
+
+  end
+end