DBIx::Class::Schema::Loader::Manual::UpgradingFromV4 - Important Information
Related to Upgrading from Version 0.04006
The new Loader detects much more information about columns and sets flags
like "is_auto_increment" that it didn't set before.
The new RelBuilder will give you nicer accessor names for relationships, so
you will no longer have conflicts between a foreign key column and the
relationship accessor itself (if the FK is named "_id".)
It will also more correctly infer the relationship type, e.g. some
relationships that were previously detected as a "has_many" will
now be a "might_have" (when it detects a unique constraint on
the foreign key column.)
Also "cascade_delete" and "cascade_copy" are turned off
for by default for "has_many" and "might_have"
relationships, while "belongs_to" relationships are created with
"on_delete => 'CASCADE'" and "on_update =>
'CASCADE'" by default. This is overridable via
Table names are now singularized when determining the "Result"
class names. So the table "user_roles" would have become
"UserRoles" in 0.04006 but now becomes "UserRole"
Now defaults to on. See "use_namespaces" in
DBIx::Class::Schema::Loader::Base and "load_namespaces" in
- Support for more databases
We now support Microsoft SQL Server and Sybase, and there are also many
improvements to the other backends.
In backward compatibility mode, the Loader will use the old relationship names
and types, will not singularize monikers for tables, and
"use_namespaces" will be off.
To control this behavior see "naming" in
DBIx::Class::Schema::Loader::Base and "use_namespaces" in
When reading a "Schema.pm" from a static schema generated with an 0.04
version of Loader, backward compatibility mode will default to on, unless
overridden with the "naming" and/or "use_namespaces"
Dynamic schemas will always by default use 0.04006 mode and have
To upgrade a dynamic schema, set the "naming" and
"use_namespaces" attributes (which is proxied to the loader) in your
See "AUTHORS" in DBIx::Class::Schema::Loader.
This library is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.