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Fix the build by merging both db migrations heads (#5464)

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Maxime Beauchemin
2018-07-23 09:43:09 -07:00
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18
CONTRIBUTING.md
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@@ -505,3 +505,21 @@ https://github.com/apache/incubator-superset/pull/3013
with a PGP key and providing MD5, Apache voting, as well as
publishing to Apache's SVN repository. View the ASF docs for more
information.
## Merging DB migrations
When 2 db migrations collide, you'll get an error message like this one:
```
alembic.util.exc.CommandError: Multiple head revisions are present for
given argument 'head'; please specify a specific target
revision, '<branchname>@head' to narrow to a specific head,
or 'heads' for all heads`
```
To fix it, first run `superset db heads`, this should list 2 or more
migration hashes. Then run
`superset db merge {PASTE_SHA1_HERE} {PASTE_SHA2_HERE}`. This will create
a new merge migration. You can then `superset db upgrade` to this new
checkpoint.