5 DBIx::Class::Schema::Loader::Manual::UpgradingFromV4 - Important Information
6 Related to Upgrading from Version 0.04006
16 The new Loader detects much more information about columns and sets flags like
17 C<is_auto_increment> that it didn't set before.
23 The new RelBuilder will give you nicer accessor names for relationships, so you
24 will no longer have conflicts between a foreign key column and the relationship
25 accessor itself (if the FK is named C<_id>.)
27 It will also more correctly infer the relationship type, e.g. some relationships
28 that were previously detected as a C<has_many> will now be a C<might_have>
29 (when it detects a unique constraint on the foreign key column.)
31 Also C<cascade_delete> and C<cascade_copy> are turned off for by default for
32 C<has_many> and C<might_have> relationships, while C<belongs_to> relationships
33 are created with C<< on_delete => 'CASCADE' >> and C<< on_update => 'CASCADE' >>
34 by default. This is overridable via
35 L<relationship_attrs|DBIx::Class::Schema::Loader::Base/relationship_attrs>.
41 Table names are now singularized when determining the C<Result> class names. So
42 the table C<user_roles> would have become C<UserRoles> in C<0.04006> but now
43 becomes C<UserRole> instead.
49 Now defaults to on. See L<DBIx::Class::Schema::Loader::Base/use_namespaces> and
50 L<DBIx::Class::Schema/"load_namespaces">.
54 Support for more databases
56 We now support Microsoft SQL Server and Sybase, and there are also many
57 improvements to the other backends.
61 =head1 Backward Compatibility
63 In backward compatibility mode, the Loader will use the old relationship names
64 and types, will not singularize monikers for tables, and C<use_namespaces> will
67 To control this behavior see L<DBIx::Class::Schema::Loader::Base/naming> and
68 L<DBIx::Class::Schema::Loader::Base/use_namespaces>.
72 When reading a C<Schema.pm> from a static schema generated with an C<0.04>
73 version of Loader, backward compatibility mode will default to on, unless
74 overridden with the C<naming> and/or C<use_namespaces> attributes.
76 =head2 Dynamic Schemas
78 Dynamic schemas will always by default use C<0.04006> mode and have
79 C<use_namespaces> off.
81 To upgrade a dynamic schema, set the C<naming> and C<use_namespaces> attributes
82 (which is proxied to the loader) in your C<Schema.pm>:
84 __PACKAGE__->naming('current');
85 __PACKAGE__->use_namespaces(1);
89 See L<DBIx::Class::Schema::Loader/AUTHOR> and L<DBIx::Class::Schema::Loader/CONTRIBUTORS>.
93 This library is free software; you can redistribute it and/or modify it under
94 the same terms as Perl itself.