to_sql_and_binds

# File activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb, line 17
      def to_sql_and_binds(arel_or_sql_string, binds = []) # :nodoc:
        if arel_or_sql_string.respond_to?(:ast)
          unless binds.empty?
            raise "Passing bind parameters with an arel AST is forbidden. "                "The values must be stored on the AST directly"
          end

          if prepared_statements
            sql, binds = visitor.accept(arel_or_sql_string.ast, collector).value

            if binds.length > bind_params_length
              unprepared_statement do
                sql, binds = to_sql_and_binds(arel_or_sql_string)
                visitor.preparable = false
              end
            end
          else
            sql = visitor.accept(arel_or_sql_string.ast, collector).value
          end
          [sql.freeze, binds]
        else
          visitor.preparable = false if prepared_statements
          [arel_or_sql_string.dup.freeze, binds]
        end
      end