visitor_for

# File activerecord/lib/active_record/connection_adapters/abstract_adapter.rb, line 54
      def self.visitor_for(pool) # :nodoc:
        adapter = pool.spec.config[:adapter]

        if Arel::Visitors::VISITORS[adapter]
          ActiveSupport::Deprecation.warn(
            "Arel::Visitors::VISITORS is deprecated and will be removed. Database adapters "              "should define a visitor_for method which returns the appropriate visitor for "              "the database. For example, MysqlAdapter.visitor_for(pool) returns "              "Arel::Visitors::MySQL.new(pool)."
          )

          Arel::Visitors::VISITORS[adapter].new(pool)
        else
          Arel::Visitors::ToSql.new(pool)
        end
      end