If i use a ldap configuration with

# config/ldap.yml
development:
  base: ou=people,dc=test,dc=com 
  attribute: uid
  group_base: ou=groups,dc=test,dc=com
  required_groups:    
    - ["moreMembers", "cn=users,ou=groups,dc=test,dc=com"]

and I have my dn like

 uid=gmgp,ou=developpers,ou=people,dc=test,dc=com 

in the log the LDAPLogger write

  LDAP: LDAP search: uid=gmgp
  LDAP: Authorizing user uid=gmgp,ou=developpers,ou=people,dc=test,dc=com
  LDAP: LDAP search: uid=gmgp
  LDAP: LDAP search: uid=gmgp
  LDAP: LDAP search: uid=gmgp
  LDAP: User uid=gmgp,ou=people,dc=test,dc=com is not in group: cn=users,ou=groups,dc=test,dc=com

my simple workaround is to create a local attribute

#devise_ldap_authenticatable-0.4.6/lib/devise_ldap_authenticatable/ldap_adapter.rb

27  class LdapConnect
28  
29        attr_reader :ldap, :login, :login_dn

54      def dn
55        DeviseLdapAuthenticatable::Logger.send("LDAP search: #{@attribute}=#{@login}")
56        filter = Net::LDAP::Filter.eq(@attribute.to_s, @login.to_s)
57        ldap_entry = nil
58        @ldap.search(:filter => filter) {|entry| ldap_entry = entry}
59        if ldap_entry.nil?
60          @ldap_auth_username_builder.call(@attribute,@login,@ldap)
61        else       
62          @login_dn = ldap_entry.dn
63        end
64      end

84      def in_required_groups?     
85        return true unless ::Devise.ldap_check_group_membership
86        
      ... 
 99         admin_ldap.search(:base => group_name, :scope => Net::LDAP::SearchScope_BaseObject) do |entry|
100            unless entry[group_attribute].include? @login_dn
101              DeviseLdapAuthenticatable::Logger.send("User #{@login_dn} is not in group: #{group_name }")
102              return false
103            end
104          end
105        end

This workaround works even if it does not solve the underlying problem
I prepare a commit as it should if I find a moment of time

Taps per migrazioni tra db (ex: sqlite3 to mysql)

Con la gemma Taps la migrazione dati da un db ad un altro è veramente semplice
Qui la guida base da cui sono partito

1) istallare taps sulle due macchine

$ [sudo] gem install taps

sembra che possa servire in alcuni casi anche

$ [sudo] gem install hoptoad_notifier

2) lanciare il server taps (che sfrutta sinatra) con il comando

$ taps server [OPTIONS] local_database_url login password

per esempio: (utente e password non presenti nel db sono aggiunti posticci in quanto richiesti)

$ taps server sqlite://development.sqlite3 pippo pippo
== Sinatra/1.0 has taken the stage on 5000 for production with backup from Mongrel

3) creare se non esistente il db di destinazione

4) lanciare taps per ricevere i dati

$ taps pull [OPTIONS] local_database_url remote_url

$ taps pull mysql://root@localhost/nome_db_destinazione http://pippo:pippo@localhost:5000

ed è tutto fatto!