To make uniqueness validator work with squeel (Rails 3.0) #437
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Please consider this to be fixed although 3-0-stable might be already out of support, but without this change, it causes ActiveRecord::StatementInvalid exception if the application uses squeel gem and the translated model uses the uniqueness validation.
https://github.com/activerecord-hackery/squeel#symbols-as-the-value-side-of-a-condition-in-normal-where-clauses
"If you have any where() clauses that use a symbol as the value side (right-hand side) of a condition, you will need to change the symbol into a string in order for it to continue to be treated as a value."