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Document that seed files are run in transactions #83

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Document that seed files are run in transactions #83

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15 changes: 15 additions & 0 deletions README.md
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Expand Up @@ -131,6 +131,21 @@ Seed files can be huge. To handle large files (over a million rows), try these
* Load a single fixture at a time with the `FILTER` environment variable
* If you don't need Seed Fu's ability to update seed with new data, then you may find that [activerecord-import](https://github.com/zdennis/activerecord-import) is faster

Seed files are run inside transactions
--------------------------------------

If a command raises, all previous database modifications on the current file are rolled back:

```ruby
User.seed do |s|
s.id = 1
s.email = "[email protected]"
end
raise
```

would not create a new user.

Generating seed files
---------------------

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