maccman/spine — pull request #315 by nvh (2012-05-31 22:01:51+00:00)
Title: Should clearing of a relation upon a refresh optional?

Model.refresh it is possible to optionally clear the current models. This commit also adds this behavior to the refresh of a relation. I found this useful in some situations, but I wonder if it should be the default as I have made it in this pull request.