NAME

       DBIx::Class::Schema::Loader::Manual::UpgradingFromV4 - Important Information Related to Upgrading from
       Version 0.04006

What Changed

       •   add_column

           The new Loader detects much more information about columns and sets flags like "is_auto_increment"
           that it didn't set before.

       •   RelBuilder

           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 relationship_attrs.

       •   moniker_map

           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" instead.

       •   use_namespaces

           Now defaults to on. See "use_namespaces" in DBIx::Class::Schema::Loader::Base and "load_namespaces"
           in DBIx::Class::Schema.

       •   Support for more databases

           We now support Microsoft SQL Server and Sybase, and there are also many improvements to the other
           backends.

Backward Compatibility

       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
       DBIx::Class::Schema::Loader::Base.

   Static Schemas
       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"
       attributes.

   Dynamic Schemas
       Dynamic schemas will always by default use 0.04006 mode and have "use_namespaces" off.

       To upgrade a dynamic schema, set the "naming" and "use_namespaces" attributes (which is proxied to the
       loader) in your "Schema.pm":

           __PACKAGE__->naming('current');
           __PACKAGE__->use_namespaces(1);

AUTHORS

       See "AUTHORS" in DBIx::Class::Schema::Loader.

LICENSE

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.

perl v5.38.2                                       2024DBIx::Class::Schema::Loader::Manual::UpgradingFromV4(3pm)