A Small Change Limits the States a Reviewer Must Hold

Mon, 01 Jul 2019 00:00:00 +0000

A table needed four columns, a self-referencing constraint, and an index. The first migration added everything in one schema callback. That was concise, but production could already contain any subset of those objects.

The repair was longer. Each column, constraint, and index became a separate guarded migration. The constraint waited for its column. The index waited for both of its columns. Rollback deliberately removed nothing because some schema objects might predate the repair.

Delivery on Brian Faust

A Small Change Limits the States a Reviewer Must Hold