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1 | =head1 NAME |
2 | |
3 | Catalyst::Upgrading - Instructions for upgrading to the latest Catalyst |
4 | |
7a504990 |
5 | =head1 Upgrading to Catalyst 5.90085 |
6 | |
7 | In this version of Catalyst we made a small change to Chained Dispatching so |
8 | that when two or more actions all have the same path specification AND they |
9 | all have Args(0), we break the tie by choosing the last action defined, and |
10 | not the first one defined. This was done to normalize Chaining to following |
11 | the 'longest Path wins, and when several actions match the same Path specification |
12 | we choose the last defined.' rule. Previously Args(0) was hard coded to be a special |
13 | case such that the first action defined would match (which is not the case when |
14 | Args is not zero.) |
15 | |
16 | Its possible that this could be a breaking change for you, if you had used |
17 | action roles (custom or otherwise) to add additional matching rules to differentiate |
18 | between several Args(0) actions that share the same root action chain. For |
19 | example if you have code now like this: |
20 | |
21 | sub check_default :Chained(/) CaptureArgs(0) { ... } |
22 | |
23 | sub default_get :Chained('check_default') PathPart('') Args(0) GET { |
24 | pop->res->body('get3'); |
25 | } |
26 | |
27 | sub default_post :Chained('check_default') PathPart('') Args(0) POST { |
28 | pop->res->body('post3'); |
29 | } |
30 | |
31 | sub chain_default :Chained('check_default') PathPart('') Args(0) { |
32 | pop->res->body('chain_default'); |
33 | } |
34 | |
35 | The way that chaining will work previous is that when two or more equal actions can |
36 | match, the 'top' one wins. So if the request is "GET .../check_default" BOTH |
37 | actions 'default_get' AND 'chain_default' would match. To break the tie in |
38 | the case when Args is 0, we'd previous take the 'top' (or first defined) action. |
39 | Unfortunately this treatment of Args(0) is special case. In all other cases |
40 | we choose the 'last defined' action to break a tie. So this version of |
41 | Catalyst changed the dispatcher to make Args(0) no longer a special case for |
42 | breaking ties. This means that the above code must now become: |
43 | |
44 | sub check_default :Chained(/) CaptureArgs(0) { ... } |
45 | |
46 | sub chain_default :Chained('check_default') PathPart('') Args(0) { |
47 | pop->res->body('chain_default'); |
48 | } |
49 | |
50 | sub default_get :Chained('check_default') PathPart('') Args(0) GET { |
51 | pop->res->body('get3'); |
52 | } |
53 | |
54 | sub default_post :Chained('check_default') PathPart('') Args(0) POST { |
55 | pop->res->body('post3'); |
56 | } |
57 | |
58 | If we want it to work as expected (for example we we GET to match 'default_get' and |
59 | POST to match 'default_post' and any other http Method to match 'chain_default'). |
60 | |
61 | In other words Arg(0) and chained actions must now follow the normal rule where |
62 | in a tie the last defined action wins and you should place all your less defined |
63 | or 'catch all' actions first. |
64 | |
65 | If this causes you trouble and you can't fix your code to conform, you may set the |
66 | application configuration setting "use_chained_args_0_special_case" to true and |
67 | that will revert you code to the previous behavior. |
68 | |
b8b29bac |
69 | =head1 Upgrading to Catalyst 5.90080 |
70 | |
71 | UTF8 encoding is now default. For temporary backwards compatibility, if this |
72 | change is causing you trouble, you can disable it by setting the application |
73 | configuration option to undef: |
74 | |
75 | MyApp->config(encoding => undef); |
76 | |
77 | But please consider this a temporary measure since it is the intention that |
78 | UTF8 is enabled going forwards and the expectation is that other ecosystem |
79 | projects will assume this as well. At some point you application will not |
80 | correctly function without this setting. |
81 | |
0d94e986 |
82 | As of 5.90084 we've added two additional configuration flags for more selective |
83 | control over some encoding changes: 'skip_body_param_unicode_decoding' and |
84 | 'skip_complex_post_part_handling'. You may use these to more selectively |
85 | disable new features while you are seeking a long term fix. Please review |
86 | CONFIGURATION in L<Catalyst>. |
87 | |
d63cc9c8 |
88 | For further information, please see L<Catalyst::UTF8> |
89 | |
b8b29bac |
90 | A number of projects in the wider ecosystem required minor updates to be able |
91 | to work correctly. Here's the known list: |
92 | |
93 | L<Catalyst::View::TT>, L<Catalyst::View::Mason>, L<Catalyst::View::HTML::Mason>, |
94 | L<Catalyst::View::Xslate>, L<Test::WWW::Mechanize::Catalyst> |
95 | |
96 | You will need to update to modern versions in most cases, although quite a few |
97 | of these only needed minor test case and documentation changes so you will need |
98 | to review the changelog of each one that is relevant to you to determine your |
99 | true upgrade needs. |
100 | |
78acc1f7 |
101 | =head1 Upgrading to Catalyst 5.90060 |
102 | |
103 | Starting in the v5.90059_001 development release, the regexp dispatch type is |
104 | no longer automatically included as a dependency. If you are still using this |
105 | dispatch type, you need to add L<Catalyst::DispatchType::Regex> into your build |
106 | system. |
107 | |
108 | The standalone distribution of Regexp will be supported for the time being, but |
109 | should we find that supporting it prevents us from moving L<Catalyst> forward |
110 | in necessary ways, we reserve the right to drop that support. It is highly |
111 | recommended that you use this last stage of deprecation to change your code. |
112 | |
ba7766f8 |
113 | =head1 Upgrading to Catalyst 5.90040 |
717fc5c9 |
114 | |
8275d3b9 |
115 | =head2 Catalyst::Plugin::Unicode::Encoding is now core |
116 | |
117 | The previously stand alone Unicode support module L<Catalyst::Plugin::Unicode::Encoding> |
118 | has been brought into core as a default plugin. Going forward, all you need is |
119 | to add a configuration setting for the encoding type. For example: |
120 | |
121 | package Myapp::Web; |
122 | |
123 | use Catalyst; |
124 | |
125 | __PACKAGE__->config( encoding => 'UTF-8' ); |
126 | |
127 | Please note that this is different from the old stand alone plugin which applied |
128 | C<UTF-8> encoding by default (that is, if you did not set an explicit |
5fa5b709 |
129 | C<encoding> configuration value, it assumed you wanted UTF-8). In order to |
8275d3b9 |
130 | preserve backwards compatibility you will need to explicitly turn it on via the |
131 | configuration setting. THIS MIGHT CHANGE IN THE FUTURE, so please consider |
132 | starting to test your application with proper UTF-8 support and remove all those |
133 | crappy hacks you munged into the code because you didn't know the Plugin |
134 | existed :) |
135 | |
136 | For people that are using the Plugin, you will note a startup warning suggesting |
137 | that you can remove it from the plugin list. When you do so, please remember to |
138 | add the configuration setting, since you can no longer rely on the default being |
139 | UTF-8. We'll add it for you if you continue to use the stand alone plugin and |
140 | we detect this, but this backwards compatibility shim will likely be removed in |
141 | a few releases (trying to clean up the codebase after all). |
142 | |
143 | If you have trouble with any of this, please bring it to the attention of the |
144 | Catalyst maintainer group. |
145 | |
146 | =head2 basic async and event loop support |
147 | |
717fc5c9 |
148 | This version of L<Catalyst> offers some support for using L<AnyEvent> and |
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149 | L<IO::Async> event loops in your application. These changes should work |
150 | fine for most applications however if you are already trying to perform |
151 | some streaming, minor changes in this area of the code might affect your |
4e6e0ab2 |
152 | functionality. Please see L<Catalyst::Response\write_fh> for more and for a |
153 | basic example. |
8275d3b9 |
154 | |
155 | We consider this feature experimental. We will try not to break it, but we |
156 | reserve the right to make necessary changes to fix major issues that people |
157 | run into when the use this functionality in the wild. |
717fc5c9 |
158 | |
ba7766f8 |
159 | =head1 Upgrading to Catalyst 5.90030 |
160 | |
161 | =head2 Regex dispatch type is deprecated. |
162 | |
163 | The Regex dispatchtype (L<Catalyst::DispatchType::Regex>) has been deprecated. |
164 | |
165 | You are encouraged to move your application to Chained dispatch (L<Catalyst::DispatchType::Chained>). |
166 | |
167 | If you cannot do so, please add a dependency to Catalyst::DispatchType::Regex to your application's |
168 | Makefile.PL |
169 | |
dacd8b0e |
170 | =head1 Upgrading to Catalyst 5.9 |
5d5f4a73 |
171 | |
e6006848 |
172 | The major change is that L<Plack>, a toolkit for using the L<PSGI> |
862a7989 |
173 | specification, now replaces most of the subclasses of L<Catalyst::Engine>. If |
e6006848 |
174 | you are using one of the standard subclasses of L<Catalyst::Engine> this |
175 | should be a straightforward upgrade for you. It was a design goal for |
176 | this release to preserve as much backwards compatibility as possible. |
177 | However, since L<Plack> is different from L<Catalyst::Engine>, it is |
178 | possible that differences exist for edge cases. Therefore, we recommend |
179 | that care be taken with this upgrade and that testing should be greater |
180 | than would be the case with a minor point update. Please inform the |
181 | Catalyst developers of any problems so that we can fix them and |
182 | incorporate tests. |
5d5f4a73 |
183 | |
773b3b08 |
184 | It is highly recommended that you become familiar with the L<Plack> ecosystem |
ae908e7e |
185 | and documentation. Being able to take advantage of L<Plack> development and |
186 | middleware is a major bonus to this upgrade. Documentation about how to |
187 | take advantage of L<Plack::Middleware> by writing your own C<< .psgi >> file |
188 | is contained in L<Catalyst::PSGI>. |
5d5f4a73 |
189 | |
e6006848 |
190 | If you have created a custom subclass of L<Catalyst:Engine>, you will |
191 | need to convert it to be a subclass of L<Plack::Handler>. |
5d5f4a73 |
192 | |
193 | If you are using the L<Plack> engine, L<Catalyst::Engine::PSGI>, this new |
773b3b08 |
194 | release supersedes that code. |
5d5f4a73 |
195 | |
e6006848 |
196 | If you are using a subclass of L<Catalyst::Engine> that is aimed at |
197 | nonstandard or internal/testing uses, such as |
198 | L<Catalyst::Engine::Embeddable>, you should still be able to continue |
199 | using that engine. |
5d5f4a73 |
200 | |
201 | Advice for specific subclasses of L<Catalyst::Engine> follows: |
202 | |
93d60cae |
203 | =head2 Upgrading the FastCGI Engine |
5d5f4a73 |
204 | |
e6006848 |
205 | No upgrade is needed if your myapp_fastcgi.pl script is already upgraded |
206 | to use L<Catalyst::Script::FastCGI>. |
5d5f4a73 |
207 | |
93d60cae |
208 | =head2 Upgrading the mod_perl / Apache Engines |
5d5f4a73 |
209 | |
e6006848 |
210 | The engines that are built upon the various iterations of mod_perl, |
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211 | L<Catalyst::Engine::Apache::MP13> (for mod_perl 1, and Apache 1.x) and |
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212 | L<Catalyst::Engine::Apache2::MP20> (for mod_perl 2, and Apache 2.x), |
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213 | should be seamless upgrades and will work using L<Plack::Handler::Apache1> |
14148e06 |
214 | or L<Plack::Handler::Apache2> as required. |
5d5f4a73 |
215 | |
e6006848 |
216 | L<Catalyst::Engine::Apache2::MP19>, however, is no longer supported, as |
862a7989 |
217 | Plack does not support mod_perl version 1.99. This is unlikely to be a |
218 | problem for anyone, as 1.99 was a brief beta-test release for mod_perl |
219 | 2, and all users of mod_perl 1.99 are encouraged to upgrade to a |
220 | supported release of Apache 2 and mod_perl 2. |
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221 | |
93d60cae |
222 | =head2 Upgrading the HTTP Engine |
5d5f4a73 |
223 | |
040835f0 |
224 | The default development server that comes with the L<Catalyst> distribution |
225 | should continue to work as expected with no changes as long as your C<myapp_server> |
226 | script is upgraded to use L<Catalyst::Script::HTTP>. |
5d5f4a73 |
227 | |
93d60cae |
228 | =head2 Upgrading the CGI Engine |
5d5f4a73 |
229 | |
697a3e9e |
230 | If you were using L<Catalyst::Engine::CGI> there is no upgrade needed if your |
e6006848 |
231 | myapp_cgi.pl script is already upgraded to use L<Catalyst::Script::CGI>. |
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232 | |
cf8eab35 |
233 | =head2 Upgrading Catalyst::Engine::HTTP::Prefork |
5d5f4a73 |
234 | |
040835f0 |
235 | If you were using L<Catalyst::Engine::HTTP::Prefork> then L<Starman> |
da9eab5a |
236 | is automatically loaded. You should (at least) change your C<Makefile.PL> |
237 | to depend on Starman. |
0ea8962d |
238 | |
da9eab5a |
239 | You can regenerate your C<myapp_server.pl> script with C<catalyst.pl> |
240 | and implement a C<MyApp::Script::Server> class that looks like this: |
241 | |
242 | package MyApp::Script::Server; |
243 | use Moose; |
244 | use namespace::autoclean; |
245 | |
246 | extends 'CatalystX::Script::Server::Starman'; |
247 | |
248 | 1; |
249 | |
e6006848 |
250 | This takes advantage of the new script system, and will add a number of |
251 | options to the standard server script as extra options are added by |
252 | Starman. |
da9eab5a |
253 | |
254 | More information about these options can be seen at |
255 | L<CatalystX::Script::Server::Starman/SYNOPSIS>. |
256 | |
257 | An alternate route to implement this functionality is to write a simple .psgi |
e6006848 |
258 | file for your application, and then use the L<plackup> utility to start the |
da9eab5a |
259 | server. |
5d5f4a73 |
260 | |
93d60cae |
261 | =head2 Upgrading the PSGI Engine |
5d5f4a73 |
262 | |
e6006848 |
263 | If you were using L<Catalyst::Engine::PSGI>, this new release supersedes |
264 | this engine in supporting L<Plack>. By default the Engine is now always |
265 | L<Plack>. As a result, you can remove the dependency on |
266 | L<Catalyst::Engine::PSGI> in your C<Makefile.PL>. |
8f912f0b |
267 | |
268 | Applications that were using L<Catalyst::Engine::PSGI> |
269 | previously should entirely continue to work in this release with no changes. |
270 | |
e6006848 |
271 | However, if you have an C<app.psgi> script, then you no longer need to |
272 | specify the PSGI engine. Instead, the L<Catalyst> application class now |
273 | has a new method C<psgi_app> which returns a L<PSGI> compatible coderef |
274 | which you can wrap in the middleware of your choice. |
8f912f0b |
275 | |
276 | Catalyst will use the .psgi for your application if it is located in the C<home> |
e6006848 |
277 | directory of the application. |
697a3e9e |
278 | |
93a57b4b |
279 | For example, if you were using L<Catalyst::Engine::PSGI> in the past, you will |
8f912f0b |
280 | have written (or generated) a C<script/myapp.psgi> file similar to this one: |
697a3e9e |
281 | |
282 | use Plack::Builder; |
283 | use MyCatalytApp; |
284 | |
285 | MyCatalystApp->setup_engine('PSGI'); |
286 | |
287 | builder { |
288 | enable ... # enable your desired middleware |
289 | sub { MyCatalystApp->run(@_) }; |
290 | }; |
291 | |
8f912f0b |
292 | Instead, you now say: |
697a3e9e |
293 | |
294 | use Plack::Builder; |
295 | use MyCatalystApp; |
296 | |
297 | builder { |
298 | enable ... #enable your desired middleware |
75d68821 |
299 | MyCatalystApp->psgi_app; |
697a3e9e |
300 | }; |
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301 | |
34effbc7 |
302 | In the simplest case: |
8f912f0b |
303 | |
34effbc7 |
304 | MyCatalystApp->setup_engine('PSGI'); |
305 | my $app = sub { MyCatalystApp->run(@_) } |
306 | |
307 | becomes |
308 | |
34effbc7 |
309 | my $app = MyCatalystApp->psgi_app(@_); |
310 | |
311 | B<NOT>: |
312 | |
313 | my $app = sub { MyCatalystApp->psgi_app(@_) }; |
314 | # If you make ^^ this mistake, your app won't work, and will confuse the hell out of you! |
315 | |
e6006848 |
316 | You can now move C<< script/myapp.psgi >> to C<< myapp.psgi >>, and the built-in |
773b3b08 |
317 | Catalyst scripts and your test suite will start using your .psgi file. |
ad15c817 |
318 | |
e6006848 |
319 | B<NOTE:> If you rename your .psgi file without these modifications, then |
320 | any tests run via L<Catalyst::Test> will not be compatible with the new |
321 | release, and will result in the development server starting, rather than |
322 | the expected test running. |
93a57b4b |
323 | |
c47cd2ce |
324 | B<NOTE:> If you are directly accessing C<< $c->req->env >> to get the PSGI |
325 | environment then this accessor is moved to C<< $c->engine->env >>, |
326 | you will need to update your code. |
327 | |
e6006848 |
328 | =head2 Engines which are known to be broken |
93a57b4b |
329 | |
e6006848 |
330 | The following engines B<DO NOT> work as of Catalyst version 5.9. The |
331 | core team will be happy to work with the developers and/or users of |
332 | these engines to help them port to the new Plack/Engine system, but for |
333 | now, applications which are currently using these engines B<WILL NOT> |
334 | run without modification to the engine code. |
93a57b4b |
335 | |
336 | =over |
337 | |
338 | =item Catalyst::Engine::Wx |
339 | |
ad15c817 |
340 | =item Catalyst::Engine::Zeus |
341 | |
342 | =item Catalyst::Engine::JobQueue::POE |
343 | |
344 | =item Catalyst::Engine::XMPP2 |
345 | |
346 | =item Catalyst::Engine::SCGI |
347 | |
93a57b4b |
348 | =back |
349 | |
5d5f4a73 |
350 | =head2 Engines with unknown status |
351 | |
e6006848 |
352 | The following engines are untested or have unknown compatibility. |
353 | Reports are highly encouraged: |
5d5f4a73 |
354 | |
ad15c817 |
355 | =over |
356 | |
357 | =item Catalyst::Engine::Mojo |
358 | |
e6006848 |
359 | =item Catalyst::Engine::Server (marked as Deprecated) |
ad15c817 |
360 | |
e6006848 |
361 | =item Catalyst::Engine::HTTP::POE (marked as Deprecated) |
ad15c817 |
362 | |
363 | =back |
5d5f4a73 |
364 | |
3f22de0b |
365 | =head2 Plack functionality |
040835f0 |
366 | |
3f22de0b |
367 | See L<Catalyst::PSGI>. |
0aafa77a |
368 | |
dacd8b0e |
369 | =head2 Tests in 5.9 |
4db14a9a |
370 | |
e6006848 |
371 | Tests should generally work the same in Catalyst 5.9, but there are |
372 | some differences. |
4db14a9a |
373 | |
e6006848 |
374 | Previously, if using L<Catalyst::Test> and doing local requests (against |
375 | a local server), if the application threw an exception then this |
376 | exception propagated into the test. |
4db14a9a |
377 | |
e6006848 |
378 | This behavior has been removed, and now a 500 response will be returned |
379 | to the test. This change standardizes behavior, so that local test |
380 | requests behave similarly to remote requests. |
4db14a9a |
381 | |
7e2ec16e |
382 | =head1 Upgrading to Catalyst 5.80 |
383 | |
5687c7f9 |
384 | Most applications and plugins should run unaltered on Catalyst 5.80. |
7e2ec16e |
385 | |
8f61d649 |
386 | However, a lot of refactoring work has taken place, and several changes have |
1a98f036 |
387 | been made which could cause incompatibilities. If your application or plugin |
8f61d649 |
388 | is using deprecated code, or relying on side effects, then you could have |
ba03ccca |
389 | issues upgrading to this release. |
5687c7f9 |
390 | |
cf8eab35 |
391 | Most issues found with existing components have been easy to |
8f61d649 |
392 | solve. This document provides a complete description of behavior changes |
393 | which may cause compatibility issues, and of new Catalyst warnings which |
773b3b08 |
394 | might be unclear. |
7e2ec16e |
395 | |
8f61d649 |
396 | If you think you have found an upgrade-related issue which is not covered in |
397 | this document, please email the Catalyst list to discuss the problem. |
7e2ec16e |
398 | |
85f0a66f |
399 | =head1 Moose features |
400 | |
8f61d649 |
401 | =head2 Application class roles |
85f0a66f |
402 | |
8f61d649 |
403 | You can only apply method modifiers after the application's C<< ->setup >> |
85f0a66f |
404 | method has been called. This means that modifiers will not work with methods |
773b3b08 |
405 | run during the call to C<< ->setup >>. |
85f0a66f |
406 | |
a6eb852a |
407 | See L<Catalyst::Manual::ExtendingCatalyst> for more information about using |
408 | L<Moose> in your applications. |
409 | |
85f0a66f |
410 | =head2 Controller actions in Moose roles |
411 | |
d76c88f3 |
412 | You can use L<MooseX::MethodAttributes::Role> if you want to declare actions |
413 | inside Moose roles. |
85f0a66f |
414 | |
d935773d |
415 | =head2 Using Moose in Components |
416 | |
417 | The correct way to use Moose in a component in a both forward and backwards |
418 | compatible way is: |
419 | |
420 | package TestApp::Controller::Root; |
421 | use Moose; |
422 | BEGIN { extends 'Catalyst::Component' }; # Or ::Controller, or whatever |
423 | |
424 | See L<Components which inherit from Moose::Object before Catalyst::Component>. |
425 | |
8f61d649 |
426 | =head1 Known backwards compatibility breakages |
7e2ec16e |
427 | |
8f61d649 |
428 | =head2 Applications in a single file |
85f0a66f |
429 | |
430 | Applications must be in their own file, and loaded at compile time. This |
8f61d649 |
431 | issue generally only affects the tests of CPAN distributions. Your |
432 | application will fail if you try to define an application inline in a |
433 | block, and use plugins which supply a C< new > method, then use that |
434 | application latter in tests within the same file. |
85f0a66f |
435 | |
436 | This is due to the fact that Catalyst is inlining a new method on your |
8f61d649 |
437 | application class allowing it to be compatible with Moose. The method |
438 | used to do this changed in 5.80004 to avoid the possibility of reporting |
439 | an 'Unknown Error' if your application failed to compile. |
85f0a66f |
440 | |
38f90e49 |
441 | =head2 Issues with Class::C3 |
442 | |
8f61d649 |
443 | Catalyst 5.80 uses the L<Algorithm::C3> method dispatch order. This is |
444 | built into Perl 5.10, and comes via L<Class::C3> for Perl 5.8. This |
445 | replaces L<NEXT> with L<Class::C3::Adopt::NEXT>, forcing all components |
446 | to resolve methods using C3, rather than the unpredictable dispatch |
447 | order of L<NEXT>. |
38f90e49 |
448 | |
cf8eab35 |
449 | This issue manifests itself by your application failing to start due to an |
5d06547d |
450 | error message about having a non-linear @ISA. |
451 | |
8f61d649 |
452 | The Catalyst plugin most often causing this is |
453 | L<Catalyst::Plugin::Session::Store::FastMmap> - if you are using this |
454 | plugin and see issues, then please upgrade your plugins, as it has been |
455 | fixed. Note that Makefile.PL in the distribution will warn about known |
456 | incompatible components. |
5d06547d |
457 | |
458 | This issue can, however, be found in your own application - the only solution is |
459 | to go through each base class of the class the error was reported against, until |
460 | you identify the ones in conflict, and resolve them. |
461 | |
462 | To be able to generate a linear @ISA, the list of superclasses for each |
463 | class must be resolvable using the C3 algorithm. Unfortunately, when |
464 | superclasses are being used as mixins (to add functionality used in your class), |
ae7da8f5 |
465 | and with multiple inheritance, it is easy to get this wrong. |
38f90e49 |
466 | |
467 | Most common is the case of: |
468 | |
469 | package Component1; # Note, this is the common case |
470 | use base qw/Class::Accessor::Fast Class::Data::Inheritable/; |
471 | |
8f61d649 |
472 | package Component2; # Accidentally saying it this way causes a failure |
38f90e49 |
473 | use base qw/Class::Data::Inheritable Class::Accessor::Fast/; |
474 | |
475 | package GoesBang; |
476 | use base qw/Component1 Component2/; |
477 | |
5d06547d |
478 | Any situation like this will cause your application to fail to start. |
38f90e49 |
479 | |
8f61d649 |
480 | For additional documentation about this issue, and how to resolve it, see |
5d06547d |
481 | L<Class::C3::Adopt::NEXT>. |
38f90e49 |
482 | |
6f04e56a |
483 | =head2 Components which inherit from Moose::Object before Catalyst::Component |
7e2ec16e |
484 | |
6f04e56a |
485 | Moose components which say: |
7e2ec16e |
486 | |
6f04e56a |
487 | package TestApp::Controller::Example; |
488 | use Moose; |
845bfcd2 |
489 | extends qw/Moose::Object Catalyst::Component/; |
7e2ec16e |
490 | |
8f61d649 |
491 | to use the constructor provided by Moose, while working (if you do some hacks |
1a98f036 |
492 | with the C< BUILDARGS > method), will not work with Catalyst 5.80 as |
6f04e56a |
493 | C<Catalyst::Component> inherits from C<Moose::Object>, and so C< @ISA > fails |
25f61108 |
494 | to linearize. |
6f04e56a |
495 | |
6f04e56a |
496 | The correct way to use Moose in a component in a both forward and backwards |
497 | compatible way is: |
498 | |
499 | package TestApp::Controller::Root; |
500 | use Moose; |
501 | BEGIN { extends 'Catalyst::Component' }; # Or ::Controller, or whatever |
502 | |
ba03ccca |
503 | Note that the C< extends > declaration needs to occur in a begin block for |
3df46b1b |
504 | L<attributes> to operate correctly. |
505 | |
d935773d |
506 | This way you do not inherit directly from C<Moose::Object> |
507 | yourself. Having components which do not inherit their constructor from |
508 | C<Catalyst::Component> is B<unsupported>, and has never been recommended, |
509 | therefore you're on your own if you're using this technique. You'll need |
510 | to detect the version of Catalyst your application is running, and deal |
511 | with it appropriately. |
512 | |
eaae9a92 |
513 | You also don't get the L<Moose::Object> constructor, and therefore attribute |
514 | initialization will not work as normally expected. If you want to use Moose |
3df46b1b |
515 | attributes, then they need to be made lazy to correctly initialize. |
516 | |
517 | Note that this only applies if your component needs to maintain component |
518 | backwards compatibility for Catalyst versions before 5.71001 - in 5.71001 |
519 | attributes work as expected, and the BUILD method is called normally |
eaae9a92 |
520 | (although BUILDARGS is not). |
3df46b1b |
521 | |
522 | If you depend on Catalyst 5.8, then B<all> Moose features work as expected. |
8566c0de |
523 | |
d935773d |
524 | You will also see this issue if you do the following: |
525 | |
526 | package TestApp::Controller::Example; |
527 | use Moose; |
528 | use base 'Catalyst::Controller'; |
529 | |
530 | as C< use base > appends to @ISA. |
531 | |
e11cac87 |
532 | =head3 use Moose in MyApp |
533 | |
534 | Similar to the above, this will also fail: |
535 | |
536 | package MyApp; |
537 | use Moose; |
538 | use Catalyst qw/ |
539 | ConfigLoader |
540 | /; |
541 | __PACKAGE__->setup; |
542 | |
543 | If you need to use Moose in your application class (e.g. for method modifiers |
8f61d649 |
544 | etc.) then the correct technique is: |
e11cac87 |
545 | |
546 | package MyApp; |
547 | use Moose; |
5b6f82d2 |
548 | use Catalyst; |
549 | |
e11cac87 |
550 | extends 'Catalyst'; |
5b6f82d2 |
551 | |
552 | __PACKAGE__->config( name => 'MyApp' ); |
e11cac87 |
553 | __PACKAGE__->setup(qw/ |
554 | ConfigLoader |
555 | /); |
556 | |
04a48104 |
557 | =head2 Anonymous closures installed directly into the symbol table |
558 | |
559 | If you have any code which installs anonymous subroutine references directly |
560 | into the symbol table, you may encounter breakages. The simplest solution is |
561 | to use L<Sub::Name> to name the subroutine. Example: |
562 | |
e11cac87 |
563 | # Original code, likely to break: |
1a98f036 |
564 | my $full_method_name = join('::', $package_name, $method_name); |
04a48104 |
565 | *$full_method_name = sub { ... }; |
566 | |
e11cac87 |
567 | # Fixed Code |
04a48104 |
568 | use Sub::Name 'subname'; |
569 | my $full_method_name = join('::',$package_name, $method_name); |
570 | *$full_method_name = subname $full_method_name, sub { ... }; |
571 | |
8f61d649 |
572 | Additionally, you can take advantage of Catalyst's use of L<Class::MOP> and |
573 | install the closure using the appropriate metaclass. Example: |
04a48104 |
574 | |
575 | use Class::MOP; |
576 | my $metaclass = Moose::Meta::Class->initialize($package_name); |
577 | $metaclass->add_method($method_name => sub { ... }); |
578 | |
780654ad |
579 | =head2 Hooking into application setup |
580 | |
8f61d649 |
581 | To execute code during application start-up, the following snippet in MyApp.pm |
780654ad |
582 | used to work: |
583 | |
584 | sub setup { |
585 | my ($class, @args) = @_; |
586 | $class->NEXT::setup(@args); |
587 | ... # things to do after the actual setup |
588 | } |
589 | |
8f61d649 |
590 | With Catalyst 5.80 this won't work anymore, because Catalyst no longer |
591 | uses NEXT.pm for method resolution. The functionality was only ever |
592 | originally operational as L<NEXT> remembers what methods have already |
593 | been called, and will not call them again. |
780654ad |
594 | |
1a98f036 |
595 | Using this now causes infinite recursion between MyApp::setup and |
596 | Catalyst::setup, due to other backwards compatibility issues related to how |
e6c5b548 |
597 | plugin setup works. Moose method modifiers like C<< before|after|around setup |
1a98f036 |
598 | => sub { ... }; >> also will not operate correctly on the setup method. |
780654ad |
599 | |
600 | The right way to do it is this: |
601 | |
602 | after setup_finalize => sub { |
603 | ... # things to do after the actual setup |
604 | }; |
605 | |
ade00972 |
606 | The setup_finalize hook was introduced as a way to avoid this issue. |
1a98f036 |
607 | |
e11cac87 |
608 | =head2 Components with a new method which returns false |
7e2ec16e |
609 | |
8dd2f514 |
610 | Previously, if you had a component which inherited from Catalyst::COMPONENT, |
8f61d649 |
611 | but overrode the new method to return false, then your class's configuration |
8dd2f514 |
612 | would be blessed into a hash on your behalf, and this would be returned from |
a87f5aa5 |
613 | the COMPONENT method. |
7e2ec16e |
614 | |
8f61d649 |
615 | This behavior makes no sense, and so has been removed. Implementing your own |
616 | C< new > method in components is B<highly> discouraged. Instead, you should |
617 | inherit the new method from Catalyst::Component, and use Moose's BUILD |
1a98f036 |
618 | functionality and/or Moose attributes to perform any construction work |
619 | necessary for your class. |
7e2ec16e |
620 | |
621 | =head2 __PACKAGE__->mk_accessor('meta'); |
622 | |
e11cac87 |
623 | Won't work due to a limitation of L<Moose>. This is currently being fixed |
624 | inside Moose. |
7e2ec16e |
625 | |
626 | =head2 Class::Data::Inheritable side effects |
627 | |
8dd2f514 |
628 | Previously, writing to a class data accessor would copy the accessor method |
629 | down into your package. |
630 | |
8f61d649 |
631 | This behavior has been removed. While the class data is still stored |
8dd2f514 |
632 | per-class, it is stored on the metaclass of the class defining the accessor. |
7e2ec16e |
633 | |
8f61d649 |
634 | Therefore anything relying on the side effect of the accessor being copied down |
8dd2f514 |
635 | will be broken. |
7e2ec16e |
636 | |
1a98f036 |
637 | The following test demonstrates the problem: |
8dd2f514 |
638 | |
639 | { |
640 | package BaseClass; |
641 | use base qw/Class::Data::Inheritable/; |
642 | __PACKAGE__->mk_classdata('foo'); |
643 | } |
644 | |
645 | { |
646 | package Child; |
647 | use base qw/BaseClass/; |
648 | } |
649 | |
650 | BaseClass->foo('base class'); |
651 | Child->foo('sub class'); |
eaae9a92 |
652 | |
e11cac87 |
653 | use Test::More; |
8dd2f514 |
654 | isnt(BaseClass->can('foo'), Child->can('foo')); |
7e2ec16e |
655 | |
f4dda4a8 |
656 | =head2 Extending Catalyst::Request or other classes in an ad hoc manner using mk_accessors |
7e2ec16e |
657 | |
8dd2f514 |
658 | Previously, it was possible to add additional accessors to Catalyst::Request |
659 | (or other classes) by calling the mk_accessors class method. |
7e2ec16e |
660 | |
8f61d649 |
661 | This is no longer supported - users should make a subclass of the class whose |
662 | behavior they would like to change, rather than globally polluting the |
e11cac87 |
663 | Catalyst objects. |
8be895a7 |
664 | |
10011c19 |
665 | =head2 Confused multiple inheritance with Catalyst::Component::COMPONENT |
8be895a7 |
666 | |
8f61d649 |
667 | Previously, Catalyst's COMPONENT method would delegate to the method on |
668 | the right hand side, which could then delegate back again with |
669 | NEXT. This is poor practice, and in addition, makes no sense with C3 |
670 | method dispatch order, and is therefore no longer supported. |
bcc773b9 |
671 | |
ba03ccca |
672 | If a COMPONENT method is detected in the inheritance hierarchy to the right |
bcc773b9 |
673 | hand side of Catalyst::Component::COMPONENT, then the following warning |
674 | message will be emitted: |
7e2ec16e |
675 | |
8dd2f514 |
676 | There is a COMPONENT method resolving after Catalyst::Component |
5687c7f9 |
677 | in ${next_package}. |
8dd2f514 |
678 | |
8f61d649 |
679 | The correct fix is to re-arrange your class's inheritance hierarchy so that the |
bcc773b9 |
680 | COMPONENT method you would like to inherit is the first (left-hand most) |
681 | COMPONENT method in your @ISA. |
7e2ec16e |
682 | |
7e9340de |
683 | =head2 Development server relying on environment variables |
684 | |
685 | Previously, the development server would allow propagation of system |
686 | environment variables into the request environment, this has changed with the |
687 | adoption of Plack. You can use L<Plack::Middleware::ForceEnv> to achieve the |
688 | same effect. |
689 | |
c571d2c8 |
690 | =head1 WARNINGS |
691 | |
63b546b1 |
692 | =head2 Actions in your application class |
693 | |
694 | Having actions in your application class will now emit a warning at application |
e256d0e1 |
695 | startup as this is deprecated. It is highly recommended that these actions are moved |
63b546b1 |
696 | into a MyApp::Controller::Root (as demonstrated by the scaffold application |
5fa5b709 |
697 | generated by catalyst.pl). |
da73c6af |
698 | |
e256d0e1 |
699 | This warning, also affects tests. You should move actions in your test, |
700 | creating a myTest::Controller::Root, like the following example: |
da73c6af |
701 | |
702 | package MyTest::Controller::Root; |
95a52a01 |
703 | |
da73c6af |
704 | use strict; |
705 | use warnings; |
95a52a01 |
706 | |
da73c6af |
707 | use parent 'Catalyst::Controller'; |
95a52a01 |
708 | |
da73c6af |
709 | __PACKAGE__->config(namespace => ''); |
95a52a01 |
710 | |
da73c6af |
711 | sub action : Local { |
712 | my ( $self, $c ) = @_; |
5fa5b709 |
713 | $c->do_something; |
da73c6af |
714 | } |
95a52a01 |
715 | |
da73c6af |
716 | 1; |
63b546b1 |
717 | |
ac9279b0 |
718 | =head2 ::[MVC]:: naming scheme |
719 | |
720 | Having packages called MyApp::[MVC]::XX is deprecated and can no longer be generated |
721 | by catalyst.pl |
722 | |
723 | This is still supported, but it is recommended that you rename your application |
724 | components to Model/View/Controller. |
725 | |
726 | A warning will be issued at application startup if the ::[MVC]:: naming scheme is |
727 | in use. |
728 | |
ade00972 |
729 | =head2 Catalyst::Base |
730 | |
8f61d649 |
731 | Any code using L<Catalyst::Base> will now emit a warning; this |
732 | module will be removed in a future release. |
ade00972 |
733 | |
c571d2c8 |
734 | =head2 Methods in Catalyst::Dispatcher |
735 | |
8f61d649 |
736 | The following methods in Catalyst::Dispatcher are implementation |
737 | details, which may change in the 5.8X release series, and therefore their use |
bcc773b9 |
738 | is highly deprecated. |
c571d2c8 |
739 | |
740 | =over |
741 | |
8dd2f514 |
742 | =item tree |
c571d2c8 |
743 | |
8dd2f514 |
744 | =item dispatch_types |
c571d2c8 |
745 | |
8dd2f514 |
746 | =item registered_dispatch_types |
c571d2c8 |
747 | |
8dd2f514 |
748 | =item method_action_class |
c571d2c8 |
749 | |
8dd2f514 |
750 | =item action_hash |
c571d2c8 |
751 | |
752 | =item container_hash |
753 | |
754 | =back |
755 | |
756 | The first time one of these methods is called, a warning will be emitted: |
7e2ec16e |
757 | |
bcc773b9 |
758 | Class $class is calling the deprecated method Catalyst::Dispatcher::$public_method_name, |
dacd8b0e |
759 | this will be removed in Catalyst 5.9 |
7e2ec16e |
760 | |
c571d2c8 |
761 | You should B<NEVER> be calling any of these methods from application code. |
762 | |
8f61d649 |
763 | Plugin authors and maintainers whose plugins currently call these methods |
8f5a2bd9 |
764 | should change to using the public API, or, if you do not feel the public API |
8f61d649 |
765 | adequately supports your use case, please email the development list to |
8f5a2bd9 |
766 | discuss what API features you need so that you can be appropriately supported. |
7e2ec16e |
767 | |
95b20422 |
768 | =head2 Class files with names that don't correspond to the packages they define |
7e2ec16e |
769 | |
e11cac87 |
770 | In this version of Catalyst, if a component is loaded from disk, but no |
ba03ccca |
771 | symbols are defined in that component's name space after it is loaded, this |
bcc773b9 |
772 | warning will be issued: |
7e2ec16e |
773 | |
bcc773b9 |
774 | require $class was successful but the package is not defined. |
7e2ec16e |
775 | |
8f61d649 |
776 | This is to protect against confusing bugs caused by mistyping package names, |
bcc773b9 |
777 | and will become a fatal error in a future version. |
778 | |
779 | Please note that 'inner packages' (via L<Devel::InnerPackage>) are still fully |
8f61d649 |
780 | supported; this warning is only issued when component file naming does not map |
bcc773b9 |
781 | to B<any> of the packages defined within that component. |
7e2ec16e |
782 | |
5687c7f9 |
783 | =head2 $c->plugin method |
784 | |
25f61108 |
785 | Calling the plugin method is deprecated, and calling it at run time is B<highly |
8dd2f514 |
786 | deprecated>. |
7e2ec16e |
787 | |
95a52a01 |
788 | Instead you are recommended to use L<Catalyst::Model::Adaptor> or similar to |
ba03ccca |
789 | compose the functionality you need outside of the main application name space. |
7e2ec16e |
790 | |
4e68badc |
791 | Calling the plugin method will not be supported past Catalyst 5.81. |
bcc773b9 |
792 | |
7e2ec16e |
793 | =cut |
4e68badc |
794 | |