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where :thisyear > :last unless :last nil?

原文 2013-09-17 21:54:32 1 1 sql/ ruby-on-rails/ ruby/ ruby-on-rails-3

I have an sql search query in my rails app:

 patients = patients.where("thisyear < last ") if search.present?

My problem is that this search query also disselects database entrys where the :last is nil

My question is how can i write an search query that does not get applied on patients where the column :last is nil ? Thanks

1 answers

patients = patients.where("last IS NULL OR thisyear < last") if search.present?

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