find

# File activerecord/lib/active_record/core.rb, line 148
      def find(*ids) # :nodoc:
        # We don't have cache keys for this stuff yet
        return super unless ids.length == 1
        return super if block_given? ||
                        primary_key.nil? ||
                        scope_attributes? ||
                        columns_hash.include?(inheritance_column) ||
                        ids.first.kind_of?(Array)

        id  = ids.first
        if ActiveRecord::Base === id
          id = id.id
          ActiveSupport::Deprecation.warn(            You are passing an instance of ActiveRecord::Base to `find`.            Please pass the id of the object by calling `.id`..squish)
        end

        key = primary_key

        statement = cached_find_by_statement(key) { |params|
          where(key => params.bind).limit(1)
        }
        record = statement.execute([id], self, connection).first
        unless record
          raise RecordNotFound.new("Couldn't find #{name} with '#{primary_key}'=#{id}",
                                   name, primary_key, id)
        end
        record
      rescue RangeError
        raise RecordNotFound.new("Couldn't find #{name} with an out of range value for '#{primary_key}'",
                                 name, primary_key)
      end