Steve Howell 4c5eb3d06e Fix transaction behavior for update_subscriptions_backend(). ...

This commit extracts compose_views() from update_subscriptions_backend(),
and it implements the correct behavior for forcing transactions to roll
back, which is to raise an exception.

There were really three steps in this commit:

- Extract buggy code to compose_views().
- Add tests on compose_views().
- Fix bugs exposed by the new tests by converting errors to exceptions.

2016-09-12 22:03:39 -07:00

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