ruby on rails - ActiveRecords: Search only on non empty parameters -

so have search on 3 fields. age , sex , ethnicity

if age given have return records matching age. if age , ethnicity given sex empty return matching records age , ethnicity. etc..

the naive way of solving this:

class profile    def self.search_profile(search_params_array)     if search_params_array.first != nil && search_params_array.second != null && search_params_array.third != null       profile.where("age = ?", search_params_array.first).where("sex = ?", search_params_array.second).where("ethnicity = ?", search_params_array.third)     end     ...      ... # can permutate between possible conditions 1 of element nil     ...   end end  

what better way approach this?

class profile    def self.search_profile(search_params_array)     params = %w(age sex ethnicity).zip(search_params_array).reject |_, v|       v.nil?      end.to_h     where(params)   end  end 

if can pass search params hash, things can easier.