can_rate? can not deal with dimension = nil

[wazery]

Issue by brookzhang
Saturday Dec 07, 2013 at 02:41 GMT
Originally opened as muratguzel#51

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If dimension.nil? , query should be " dimension is null ", not "dimension = '' ".

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brookzhang included the following code: https://github.com/muratguzel/letsrate/pull/51/commits