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=head1 UPGRADING FROM RT 4.0.0 and greater
This documentation notes internals changes between the 4.0 and 4.2
series that are primarily of interest to developers writing extensions
or local customizations. It is not an exhaustive list.
=over
=item *
The link direction and type maps are consolidated into RT::Link. If you
wrote local customizations or extensions utilizing C<%RT::Ticket::LINKDIRMAP>,
C<%RT::Ticket::LINKTYPEMAP>, C<RT::Ticket-E<gt>LINKDIRMAP>,
C<RT::Ticket-E<gt>LINKTYPEMAP>, or C<%RT::Record::LINKDIRMAP>, you will need to
switch to C<%RT::Link::DIRMAP> and C<%RT::Link::TYPEMAP>.
=item *
MakeClicky handlers added via a callback are now passed an "object" key in
the parameter hash instead of "ticket". The object may be any L<RT::Record>
subclass.
=item *
C<ShowUser> handlers (C</Elements/ShowUser*>) have moved out of Mason components
and into C<RT::User> methods. Any custom username formats will need to be
reimplemented as C<RT::User> methods. Renaming should follow that of the core
components:
/Elements/ShowUserConcise => RT::User->_FormatUserConcise
/Elements/ShowUserVerbose => RT::User->_FormatUserVerbose
The C<_FormatUser*> methods are passed a hash containing the keys C<User> and
C<Address>, which have the same properties as before.
=item *
CSS is no longer processed through Mason; it's served by a proper static file
handler. If you used the C<Begin> or C<End> callbacks of C<main.css> in the
aileron, web2, or ballard themes, you should transition to the
L<RT_Config/@CSSFiles> config option. If you need to target specific themes,
you can use the class set on the E<lt>C<body>E<gt> element (for example:
body.aileron). See F<docs/customizing/styling_rt.pod> for more information
on custom styles.
=item *
The C<AddRights> and C<AddRightCategories> methods on L<RT::Class>,
L<RT::CustomField>, L<RT::Group>, L<RT::Queue>, and L<RT::System> were
refactored into L<RT::Record::Role::Rights/AddRight>.
=back
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