edx-solutions/edx-platform — pull request #185 by mattdrayer (2014-08-15 02:16:45+00:00)
Title: mattdrayer/api-workgroup-user-check: Ensure no existing workgroup assign...

...ment

In response to PR #4364, this PR introduces a check for a preexisting workgroup assignment. I opted to handle the assignment validation in the view, versus the model, although I suppose we could shift the logic there if need be. @martynjames @antoviaque @aboudreault -- take a look and let me know what you think.