PostEnqueuer object to handle validation of enqueued posts

lib/has_errors.rb

@@ -0,0 +1,31 @@
+# Helper functions for dealing with errors and objects that have
+# child objects with errors
+module HasErrors
+
+  def errors
+    @errors ||= ActiveModel::Errors.new(self)
+  end
+
+  def validate_child(obj)
+    return true if obj.valid?
+    add_errors_from(obj)
+    false
+  end
+
+  def rollback_with!(obj, error)
+    obj.errors[:base] << error
+    rollback_from_errors!(obj)
+  end
+
+  def rollback_from_errors!(obj)
+    add_errors_from(obj)
+    raise ActiveRecord::Rollback.new
+  end
+
+  def add_errors_from(obj)
+    obj.errors.full_messages.each do |msg|
+      errors[:base] << msg unless errors[:base].include?(msg)
+    end
+  end
+
+end