build_where

# File activerecord/lib/active_record/relation/query_methods.rb, line 321
    def build_where(opts, other = [])
      case opts
      when String, Array
        [@klass.send(:sanitize_sql, other.empty? ? opts : ([opts] + other))]
      when Hash
        attributes = @klass.send(:expand_hash_conditions_for_aggregates, opts)
        PredicateBuilder.build_from_hash(table.engine, attributes, table)
      else
        [opts]
      end
    end