Elvira Sheina bfba0aa711 Refactor validateAttribute method in UniqueValidator (#13202) ...

* Refactor validateAttribute method in UniqueValidator

Extract prepareParams and prepareQuery from validateAttribute,
so they can be tested separately.

* Added issue number to changelog

* Eliminated unneeded variable

* Renamed methods and parameters, update PHPDocs

2016-12-15 12:23:16 +01:00

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