undefined variable $colcolname, line 95 of tw.views_default.inc

I swear this used to work, but I also might be misremembering. In any case, we should probably document this behaviour a bit better, which I'm willing to do once I figure out what's going on. :)

I have two tables:

groupinfo (analogous to "roles")
group_id (PK)
groupname

user_accounts (analogous to "users")
id (PK)
password
group_id (FK)
... some other stuff

I want to import the users, retaining their role assignments. Migrate module does not expose "Role ID" as a possible mapping destination, so my guess is I need to trigger the import based on human-readable name.

I tried to do this by defining a relationship between the two tables. I checked off user_accounts.group_id as an "available key" then went to admin/content/tw/relationships and set:

* Base table field: user_accounts.group_id
* Related table field: groupinfo.group_id
* Automation: Automatic

(I also tried flipping these in case I got this wrong, and adding relationships for both directions, and changing the automation type from auto to manual. Same behaviour in all cases.)

What I expected to happen as a result is when I go back and view the auto-generated view for the user_accounts table, I would see groupinfo data in it. Instead, I do not see that, and when I try and go in and manually add the relationship myself by editing the View, it tells me "No relationships found."

So. Bug, or did I miss a step? :)