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| author | Bob Lail <bob.lailfamily@gmail.com> | 2019-03-08 08:04:53 -0600 |
|---|---|---|
| committer | Bob Lail <bob.lailfamily@gmail.com> | 2019-03-08 08:04:53 -0600 |
| commit | 02441e8f1726efaa69e2683702652ed343692b6c (patch) | |
| tree | ffc0a60fc982b7c22c19a0181d8b8cf1e486cf58 /guides/source/4_0_release_notes.md | |
| parent | 199de6bee261dd816b68c841c7775fdcd02b68d2 (diff) | |
| download | rails-02441e8f1726efaa69e2683702652ed343692b6c.tar.gz rails-02441e8f1726efaa69e2683702652ed343692b6c.tar.bz2 rails-02441e8f1726efaa69e2683702652ed343692b6c.zip | |
Update documentation on upsert_all so that it is correct for Postgres
Details in https://github.com/rails/rails/issues/35519
In short, MySQL and Sqlite3 allow a record to be both inserted _and_ replaced in the same operation. Postgres (and the SQL-2003 rules for MERGE) do not.
Postgres's rationale seems to be that the operation would be nondeterministic.
I think it's OK for Rails users to have a different experience with this feature depending on their database; but I think you should be able to follow the examples in the docs on any database.
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