Contents

# Sample - Commit Timestamps

This example shows how to set an attribute to the [commit timestamp of a transaction](https://cloud.google.com/spanner/docs/commit-timestamp)
using the Spanner ActiveRecord adapter. Setting the commit timestamp is different from the built-in
`created_at`/`updated_at` [feature](https://guides.rubyonrails.org/active_record_basics.html#schema-conventions) of
ActiveRecord. A `created_at`/`updated_at` column that is managed by ActiveRecord will be set to the date/time of the
__client__ when the record is created/updated. The commit timestamp of a transaction is generated by Cloud Spanner and
is set by the server when the transaction is committed. All records that are created or updated in the same transaction
will be assigned the exact same commit timestamp.

The sample will automatically start a Spanner Emulator in a docker container and execute the sample
against that emulator. The emulator will automatically be stopped when the application finishes.

Run the application with the command

```bash
bundle exec rake run
```

Version data entries

21 entries across 21 versions & 1 rubygems

Version	Path
activerecord-spanner-adapter-0.5.0	examples/snippets/commit-timestamp/README.md