Fix migration when adding uuids #1716
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Great! Thanks. I fixed the code a bit according to the following: |
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This is a fix for #1595.
What happened was that if there was data in the DB, a single uuid4 value would be created, so the migration would fail because of the unique constraint.
The change is to first create the field, without a unique constraint and with null values, run a Python function to create uuid4s for each Example, and then change the field to have the unique constraints.