01 Oct '13, 3pm

@freaklikeme @clemensk there’s even a paragraph about it in the manual:

This could even happen if you use transactions with the ‘serializable’ isolation level. The best way to work around this problem is to add a unique index to the database table using ActiveRecord::ConnectionAdapters::SchemaStatements#add_index. In the rare case that a race condition occurs, the database will guarantee the field’s uniqueness.

Full article: http://apidock.com/rails/ActiveRecord/Validations/ClassMe...

Tweets

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