new

# File activerecord/lib/active_record/validations/uniqueness.rb, line 4
      def initialize(options)
        if options[:conditions] && !options[:conditions].respond_to?(:call)
          raise ArgumentError, "#{options[:conditions]} was passed as :conditions but is not callable. "                                 "Pass a callable instead: `conditions: -> { where(approved: true) }`"
        end
        super({ case_sensitive: true }.merge!(options))
        @klass = options[:class]
      end