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8c57b129 |
1 | =head1 NAME |
2 | |
3 | Catalyst::Upgrading - Instructions for upgrading to the latest Catalyst |
4 | |
ec4d7259 |
5 | =head1 Upgrading to Catalyst 5.90090 |
6 | |
7 | L<Catalyst::Utils> has a new method 'inject_component' which works the same as the method of |
8 | the same name in L<CatalystX::InjectComponent>. You should start converting any |
9 | use of the non core method in your code as future changes to Catalyst will be |
10 | sychronized to the core method first. We reserve the right to cease support |
11 | of the non core version should we reach a point in time where it cannot be |
12 | properly supported as an external module. Luckily this should be a trivial |
13 | search and replace. Change all occurances of: |
14 | |
15 | CatalystX::InjectComponent->inject(...) |
16 | |
17 | Into |
18 | |
19 | Catalyst::Utils::inject_component(...) |
20 | |
21 | and we expect everything to work the same (we'd consider it not working the same |
22 | to be a bug, and please report it.) |
23 | |
7a504990 |
24 | =head1 Upgrading to Catalyst 5.90085 |
25 | |
26 | In this version of Catalyst we made a small change to Chained Dispatching so |
27 | that when two or more actions all have the same path specification AND they |
28 | all have Args(0), we break the tie by choosing the last action defined, and |
29 | not the first one defined. This was done to normalize Chaining to following |
30 | the 'longest Path wins, and when several actions match the same Path specification |
31 | we choose the last defined.' rule. Previously Args(0) was hard coded to be a special |
32 | case such that the first action defined would match (which is not the case when |
33 | Args is not zero.) |
34 | |
35 | Its possible that this could be a breaking change for you, if you had used |
36 | action roles (custom or otherwise) to add additional matching rules to differentiate |
37 | between several Args(0) actions that share the same root action chain. For |
38 | example if you have code now like this: |
39 | |
40 | sub check_default :Chained(/) CaptureArgs(0) { ... } |
41 | |
42 | sub default_get :Chained('check_default') PathPart('') Args(0) GET { |
43 | pop->res->body('get3'); |
44 | } |
45 | |
46 | sub default_post :Chained('check_default') PathPart('') Args(0) POST { |
47 | pop->res->body('post3'); |
48 | } |
49 | |
50 | sub chain_default :Chained('check_default') PathPart('') Args(0) { |
51 | pop->res->body('chain_default'); |
52 | } |
53 | |
54 | The way that chaining will work previous is that when two or more equal actions can |
55 | match, the 'top' one wins. So if the request is "GET .../check_default" BOTH |
56 | actions 'default_get' AND 'chain_default' would match. To break the tie in |
57 | the case when Args is 0, we'd previous take the 'top' (or first defined) action. |
58 | Unfortunately this treatment of Args(0) is special case. In all other cases |
59 | we choose the 'last defined' action to break a tie. So this version of |
60 | Catalyst changed the dispatcher to make Args(0) no longer a special case for |
61 | breaking ties. This means that the above code must now become: |
62 | |
63 | sub check_default :Chained(/) CaptureArgs(0) { ... } |
64 | |
65 | sub chain_default :Chained('check_default') PathPart('') Args(0) { |
66 | pop->res->body('chain_default'); |
67 | } |
68 | |
69 | sub default_get :Chained('check_default') PathPart('') Args(0) GET { |
70 | pop->res->body('get3'); |
71 | } |
72 | |
73 | sub default_post :Chained('check_default') PathPart('') Args(0) POST { |
74 | pop->res->body('post3'); |
75 | } |
76 | |
77 | If we want it to work as expected (for example we we GET to match 'default_get' and |
78 | POST to match 'default_post' and any other http Method to match 'chain_default'). |
79 | |
80 | In other words Arg(0) and chained actions must now follow the normal rule where |
81 | in a tie the last defined action wins and you should place all your less defined |
82 | or 'catch all' actions first. |
83 | |
84 | If this causes you trouble and you can't fix your code to conform, you may set the |
85 | application configuration setting "use_chained_args_0_special_case" to true and |
86 | that will revert you code to the previous behavior. |
87 | |
6cf77e11 |
88 | =head2 More backwards compatibility options with UTF-8 changes |
89 | |
90 | In order to give better backwards compatiblity with the 5.90080+ UTF-8 changes |
91 | we've added several configuration options around control of how we try to decode |
92 | your URL keywords / query parameters. |
93 | |
94 | C<do_not_decode_query> |
95 | |
96 | If true, then do not try to character decode any wide characters in your |
97 | request URL query or keywords. Most readings of the relevent specifications |
98 | suggest these should be UTF-* encoded, which is the default that L<Catalyst> |
99 | will use, hwoever if you are creating a lot of URLs manually or have external |
100 | evil clients, this might cause you trouble. If you find the changes introduced |
101 | in Catalyst version 5.90080+ break some of your query code, you may disable |
102 | the UTF-8 decoding globally using this configuration. |
103 | |
104 | This setting takes precedence over C<default_query_encoding> and |
105 | C<decode_query_using_global_encoding> |
106 | |
107 | C<default_query_encoding> |
108 | |
109 | By default we decode query and keywords in your request URL using UTF-8, which |
110 | is our reading of the relevent specifications. This setting allows one to |
111 | specify a fixed value for how to decode your query. You might need this if |
112 | you are doing a lot of custom encoding of your URLs and not using UTF-8. |
113 | |
114 | This setting take precedence over C<decode_query_using_global_encoding>. |
115 | |
116 | C<decode_query_using_global_encoding> |
117 | |
118 | Setting this to true will default your query decoding to whatever your |
119 | general global encoding is (the default is UTF-8). |
120 | |
121 | |
b8b29bac |
122 | =head1 Upgrading to Catalyst 5.90080 |
123 | |
124 | UTF8 encoding is now default. For temporary backwards compatibility, if this |
125 | change is causing you trouble, you can disable it by setting the application |
126 | configuration option to undef: |
127 | |
128 | MyApp->config(encoding => undef); |
129 | |
130 | But please consider this a temporary measure since it is the intention that |
131 | UTF8 is enabled going forwards and the expectation is that other ecosystem |
132 | projects will assume this as well. At some point you application will not |
133 | correctly function without this setting. |
134 | |
0d94e986 |
135 | As of 5.90084 we've added two additional configuration flags for more selective |
136 | control over some encoding changes: 'skip_body_param_unicode_decoding' and |
137 | 'skip_complex_post_part_handling'. You may use these to more selectively |
138 | disable new features while you are seeking a long term fix. Please review |
139 | CONFIGURATION in L<Catalyst>. |
140 | |
d63cc9c8 |
141 | For further information, please see L<Catalyst::UTF8> |
142 | |
b8b29bac |
143 | A number of projects in the wider ecosystem required minor updates to be able |
144 | to work correctly. Here's the known list: |
145 | |
146 | L<Catalyst::View::TT>, L<Catalyst::View::Mason>, L<Catalyst::View::HTML::Mason>, |
147 | L<Catalyst::View::Xslate>, L<Test::WWW::Mechanize::Catalyst> |
148 | |
149 | You will need to update to modern versions in most cases, although quite a few |
150 | of these only needed minor test case and documentation changes so you will need |
151 | to review the changelog of each one that is relevant to you to determine your |
152 | true upgrade needs. |
153 | |
78acc1f7 |
154 | =head1 Upgrading to Catalyst 5.90060 |
155 | |
156 | Starting in the v5.90059_001 development release, the regexp dispatch type is |
157 | no longer automatically included as a dependency. If you are still using this |
158 | dispatch type, you need to add L<Catalyst::DispatchType::Regex> into your build |
159 | system. |
160 | |
161 | The standalone distribution of Regexp will be supported for the time being, but |
162 | should we find that supporting it prevents us from moving L<Catalyst> forward |
163 | in necessary ways, we reserve the right to drop that support. It is highly |
164 | recommended that you use this last stage of deprecation to change your code. |
165 | |
ba7766f8 |
166 | =head1 Upgrading to Catalyst 5.90040 |
717fc5c9 |
167 | |
8275d3b9 |
168 | =head2 Catalyst::Plugin::Unicode::Encoding is now core |
169 | |
170 | The previously stand alone Unicode support module L<Catalyst::Plugin::Unicode::Encoding> |
171 | has been brought into core as a default plugin. Going forward, all you need is |
172 | to add a configuration setting for the encoding type. For example: |
173 | |
174 | package Myapp::Web; |
175 | |
176 | use Catalyst; |
177 | |
178 | __PACKAGE__->config( encoding => 'UTF-8' ); |
179 | |
180 | Please note that this is different from the old stand alone plugin which applied |
181 | C<UTF-8> encoding by default (that is, if you did not set an explicit |
5fa5b709 |
182 | C<encoding> configuration value, it assumed you wanted UTF-8). In order to |
8275d3b9 |
183 | preserve backwards compatibility you will need to explicitly turn it on via the |
184 | configuration setting. THIS MIGHT CHANGE IN THE FUTURE, so please consider |
185 | starting to test your application with proper UTF-8 support and remove all those |
186 | crappy hacks you munged into the code because you didn't know the Plugin |
187 | existed :) |
188 | |
189 | For people that are using the Plugin, you will note a startup warning suggesting |
190 | that you can remove it from the plugin list. When you do so, please remember to |
191 | add the configuration setting, since you can no longer rely on the default being |
192 | UTF-8. We'll add it for you if you continue to use the stand alone plugin and |
193 | we detect this, but this backwards compatibility shim will likely be removed in |
194 | a few releases (trying to clean up the codebase after all). |
195 | |
196 | If you have trouble with any of this, please bring it to the attention of the |
197 | Catalyst maintainer group. |
198 | |
199 | =head2 basic async and event loop support |
200 | |
717fc5c9 |
201 | This version of L<Catalyst> offers some support for using L<AnyEvent> and |
e37f92f5 |
202 | L<IO::Async> event loops in your application. These changes should work |
203 | fine for most applications however if you are already trying to perform |
204 | some streaming, minor changes in this area of the code might affect your |
4e6e0ab2 |
205 | functionality. Please see L<Catalyst::Response\write_fh> for more and for a |
206 | basic example. |
8275d3b9 |
207 | |
208 | We consider this feature experimental. We will try not to break it, but we |
209 | reserve the right to make necessary changes to fix major issues that people |
210 | run into when the use this functionality in the wild. |
717fc5c9 |
211 | |
ba7766f8 |
212 | =head1 Upgrading to Catalyst 5.90030 |
213 | |
214 | =head2 Regex dispatch type is deprecated. |
215 | |
216 | The Regex dispatchtype (L<Catalyst::DispatchType::Regex>) has been deprecated. |
217 | |
218 | You are encouraged to move your application to Chained dispatch (L<Catalyst::DispatchType::Chained>). |
219 | |
220 | If you cannot do so, please add a dependency to Catalyst::DispatchType::Regex to your application's |
221 | Makefile.PL |
222 | |
dacd8b0e |
223 | =head1 Upgrading to Catalyst 5.9 |
5d5f4a73 |
224 | |
e6006848 |
225 | The major change is that L<Plack>, a toolkit for using the L<PSGI> |
862a7989 |
226 | specification, now replaces most of the subclasses of L<Catalyst::Engine>. If |
e6006848 |
227 | you are using one of the standard subclasses of L<Catalyst::Engine> this |
228 | should be a straightforward upgrade for you. It was a design goal for |
229 | this release to preserve as much backwards compatibility as possible. |
230 | However, since L<Plack> is different from L<Catalyst::Engine>, it is |
231 | possible that differences exist for edge cases. Therefore, we recommend |
232 | that care be taken with this upgrade and that testing should be greater |
233 | than would be the case with a minor point update. Please inform the |
234 | Catalyst developers of any problems so that we can fix them and |
235 | incorporate tests. |
5d5f4a73 |
236 | |
773b3b08 |
237 | It is highly recommended that you become familiar with the L<Plack> ecosystem |
ae908e7e |
238 | and documentation. Being able to take advantage of L<Plack> development and |
239 | middleware is a major bonus to this upgrade. Documentation about how to |
240 | take advantage of L<Plack::Middleware> by writing your own C<< .psgi >> file |
241 | is contained in L<Catalyst::PSGI>. |
5d5f4a73 |
242 | |
e6006848 |
243 | If you have created a custom subclass of L<Catalyst:Engine>, you will |
244 | need to convert it to be a subclass of L<Plack::Handler>. |
5d5f4a73 |
245 | |
246 | If you are using the L<Plack> engine, L<Catalyst::Engine::PSGI>, this new |
773b3b08 |
247 | release supersedes that code. |
5d5f4a73 |
248 | |
e6006848 |
249 | If you are using a subclass of L<Catalyst::Engine> that is aimed at |
250 | nonstandard or internal/testing uses, such as |
251 | L<Catalyst::Engine::Embeddable>, you should still be able to continue |
252 | using that engine. |
5d5f4a73 |
253 | |
254 | Advice for specific subclasses of L<Catalyst::Engine> follows: |
255 | |
93d60cae |
256 | =head2 Upgrading the FastCGI Engine |
5d5f4a73 |
257 | |
e6006848 |
258 | No upgrade is needed if your myapp_fastcgi.pl script is already upgraded |
259 | to use L<Catalyst::Script::FastCGI>. |
5d5f4a73 |
260 | |
93d60cae |
261 | =head2 Upgrading the mod_perl / Apache Engines |
5d5f4a73 |
262 | |
e6006848 |
263 | The engines that are built upon the various iterations of mod_perl, |
14148e06 |
264 | L<Catalyst::Engine::Apache::MP13> (for mod_perl 1, and Apache 1.x) and |
862a7989 |
265 | L<Catalyst::Engine::Apache2::MP20> (for mod_perl 2, and Apache 2.x), |
bd85860b |
266 | should be seamless upgrades and will work using L<Plack::Handler::Apache1> |
14148e06 |
267 | or L<Plack::Handler::Apache2> as required. |
5d5f4a73 |
268 | |
e6006848 |
269 | L<Catalyst::Engine::Apache2::MP19>, however, is no longer supported, as |
862a7989 |
270 | Plack does not support mod_perl version 1.99. This is unlikely to be a |
271 | problem for anyone, as 1.99 was a brief beta-test release for mod_perl |
272 | 2, and all users of mod_perl 1.99 are encouraged to upgrade to a |
273 | supported release of Apache 2 and mod_perl 2. |
5d5f4a73 |
274 | |
93d60cae |
275 | =head2 Upgrading the HTTP Engine |
5d5f4a73 |
276 | |
040835f0 |
277 | The default development server that comes with the L<Catalyst> distribution |
278 | should continue to work as expected with no changes as long as your C<myapp_server> |
279 | script is upgraded to use L<Catalyst::Script::HTTP>. |
5d5f4a73 |
280 | |
93d60cae |
281 | =head2 Upgrading the CGI Engine |
5d5f4a73 |
282 | |
697a3e9e |
283 | If you were using L<Catalyst::Engine::CGI> there is no upgrade needed if your |
e6006848 |
284 | myapp_cgi.pl script is already upgraded to use L<Catalyst::Script::CGI>. |
5d5f4a73 |
285 | |
cf8eab35 |
286 | =head2 Upgrading Catalyst::Engine::HTTP::Prefork |
5d5f4a73 |
287 | |
040835f0 |
288 | If you were using L<Catalyst::Engine::HTTP::Prefork> then L<Starman> |
da9eab5a |
289 | is automatically loaded. You should (at least) change your C<Makefile.PL> |
290 | to depend on Starman. |
0ea8962d |
291 | |
da9eab5a |
292 | You can regenerate your C<myapp_server.pl> script with C<catalyst.pl> |
293 | and implement a C<MyApp::Script::Server> class that looks like this: |
294 | |
295 | package MyApp::Script::Server; |
296 | use Moose; |
297 | use namespace::autoclean; |
298 | |
299 | extends 'CatalystX::Script::Server::Starman'; |
300 | |
301 | 1; |
302 | |
e6006848 |
303 | This takes advantage of the new script system, and will add a number of |
304 | options to the standard server script as extra options are added by |
305 | Starman. |
da9eab5a |
306 | |
307 | More information about these options can be seen at |
308 | L<CatalystX::Script::Server::Starman/SYNOPSIS>. |
309 | |
310 | An alternate route to implement this functionality is to write a simple .psgi |
e6006848 |
311 | file for your application, and then use the L<plackup> utility to start the |
da9eab5a |
312 | server. |
5d5f4a73 |
313 | |
93d60cae |
314 | =head2 Upgrading the PSGI Engine |
5d5f4a73 |
315 | |
e6006848 |
316 | If you were using L<Catalyst::Engine::PSGI>, this new release supersedes |
317 | this engine in supporting L<Plack>. By default the Engine is now always |
318 | L<Plack>. As a result, you can remove the dependency on |
319 | L<Catalyst::Engine::PSGI> in your C<Makefile.PL>. |
8f912f0b |
320 | |
321 | Applications that were using L<Catalyst::Engine::PSGI> |
322 | previously should entirely continue to work in this release with no changes. |
323 | |
e6006848 |
324 | However, if you have an C<app.psgi> script, then you no longer need to |
325 | specify the PSGI engine. Instead, the L<Catalyst> application class now |
326 | has a new method C<psgi_app> which returns a L<PSGI> compatible coderef |
327 | which you can wrap in the middleware of your choice. |
8f912f0b |
328 | |
329 | Catalyst will use the .psgi for your application if it is located in the C<home> |
e6006848 |
330 | directory of the application. |
697a3e9e |
331 | |
93a57b4b |
332 | For example, if you were using L<Catalyst::Engine::PSGI> in the past, you will |
8f912f0b |
333 | have written (or generated) a C<script/myapp.psgi> file similar to this one: |
697a3e9e |
334 | |
335 | use Plack::Builder; |
336 | use MyCatalytApp; |
337 | |
338 | MyCatalystApp->setup_engine('PSGI'); |
339 | |
340 | builder { |
341 | enable ... # enable your desired middleware |
342 | sub { MyCatalystApp->run(@_) }; |
343 | }; |
344 | |
8f912f0b |
345 | Instead, you now say: |
697a3e9e |
346 | |
347 | use Plack::Builder; |
348 | use MyCatalystApp; |
349 | |
350 | builder { |
351 | enable ... #enable your desired middleware |
75d68821 |
352 | MyCatalystApp->psgi_app; |
697a3e9e |
353 | }; |
5d5f4a73 |
354 | |
34effbc7 |
355 | In the simplest case: |
8f912f0b |
356 | |
34effbc7 |
357 | MyCatalystApp->setup_engine('PSGI'); |
358 | my $app = sub { MyCatalystApp->run(@_) } |
359 | |
360 | becomes |
361 | |
34effbc7 |
362 | my $app = MyCatalystApp->psgi_app(@_); |
363 | |
364 | B<NOT>: |
365 | |
366 | my $app = sub { MyCatalystApp->psgi_app(@_) }; |
367 | # If you make ^^ this mistake, your app won't work, and will confuse the hell out of you! |
368 | |
e6006848 |
369 | You can now move C<< script/myapp.psgi >> to C<< myapp.psgi >>, and the built-in |
773b3b08 |
370 | Catalyst scripts and your test suite will start using your .psgi file. |
ad15c817 |
371 | |
e6006848 |
372 | B<NOTE:> If you rename your .psgi file without these modifications, then |
373 | any tests run via L<Catalyst::Test> will not be compatible with the new |
374 | release, and will result in the development server starting, rather than |
375 | the expected test running. |
93a57b4b |
376 | |
c47cd2ce |
377 | B<NOTE:> If you are directly accessing C<< $c->req->env >> to get the PSGI |
378 | environment then this accessor is moved to C<< $c->engine->env >>, |
379 | you will need to update your code. |
380 | |
e6006848 |
381 | =head2 Engines which are known to be broken |
93a57b4b |
382 | |
e6006848 |
383 | The following engines B<DO NOT> work as of Catalyst version 5.9. The |
384 | core team will be happy to work with the developers and/or users of |
385 | these engines to help them port to the new Plack/Engine system, but for |
386 | now, applications which are currently using these engines B<WILL NOT> |
387 | run without modification to the engine code. |
93a57b4b |
388 | |
389 | =over |
390 | |
391 | =item Catalyst::Engine::Wx |
392 | |
ad15c817 |
393 | =item Catalyst::Engine::Zeus |
394 | |
395 | =item Catalyst::Engine::JobQueue::POE |
396 | |
397 | =item Catalyst::Engine::XMPP2 |
398 | |
399 | =item Catalyst::Engine::SCGI |
400 | |
93a57b4b |
401 | =back |
402 | |
5d5f4a73 |
403 | =head2 Engines with unknown status |
404 | |
e6006848 |
405 | The following engines are untested or have unknown compatibility. |
406 | Reports are highly encouraged: |
5d5f4a73 |
407 | |
ad15c817 |
408 | =over |
409 | |
410 | =item Catalyst::Engine::Mojo |
411 | |
e6006848 |
412 | =item Catalyst::Engine::Server (marked as Deprecated) |
ad15c817 |
413 | |
e6006848 |
414 | =item Catalyst::Engine::HTTP::POE (marked as Deprecated) |
ad15c817 |
415 | |
416 | =back |
5d5f4a73 |
417 | |
3f22de0b |
418 | =head2 Plack functionality |
040835f0 |
419 | |
3f22de0b |
420 | See L<Catalyst::PSGI>. |
0aafa77a |
421 | |
dacd8b0e |
422 | =head2 Tests in 5.9 |
4db14a9a |
423 | |
e6006848 |
424 | Tests should generally work the same in Catalyst 5.9, but there are |
425 | some differences. |
4db14a9a |
426 | |
e6006848 |
427 | Previously, if using L<Catalyst::Test> and doing local requests (against |
428 | a local server), if the application threw an exception then this |
429 | exception propagated into the test. |
4db14a9a |
430 | |
e6006848 |
431 | This behavior has been removed, and now a 500 response will be returned |
432 | to the test. This change standardizes behavior, so that local test |
433 | requests behave similarly to remote requests. |
4db14a9a |
434 | |
7e2ec16e |
435 | =head1 Upgrading to Catalyst 5.80 |
436 | |
5687c7f9 |
437 | Most applications and plugins should run unaltered on Catalyst 5.80. |
7e2ec16e |
438 | |
8f61d649 |
439 | However, a lot of refactoring work has taken place, and several changes have |
1a98f036 |
440 | been made which could cause incompatibilities. If your application or plugin |
8f61d649 |
441 | is using deprecated code, or relying on side effects, then you could have |
ba03ccca |
442 | issues upgrading to this release. |
5687c7f9 |
443 | |
cf8eab35 |
444 | Most issues found with existing components have been easy to |
8f61d649 |
445 | solve. This document provides a complete description of behavior changes |
446 | which may cause compatibility issues, and of new Catalyst warnings which |
773b3b08 |
447 | might be unclear. |
7e2ec16e |
448 | |
8f61d649 |
449 | If you think you have found an upgrade-related issue which is not covered in |
450 | this document, please email the Catalyst list to discuss the problem. |
7e2ec16e |
451 | |
85f0a66f |
452 | =head1 Moose features |
453 | |
8f61d649 |
454 | =head2 Application class roles |
85f0a66f |
455 | |
8f61d649 |
456 | You can only apply method modifiers after the application's C<< ->setup >> |
85f0a66f |
457 | method has been called. This means that modifiers will not work with methods |
773b3b08 |
458 | run during the call to C<< ->setup >>. |
85f0a66f |
459 | |
a6eb852a |
460 | See L<Catalyst::Manual::ExtendingCatalyst> for more information about using |
461 | L<Moose> in your applications. |
462 | |
85f0a66f |
463 | =head2 Controller actions in Moose roles |
464 | |
d76c88f3 |
465 | You can use L<MooseX::MethodAttributes::Role> if you want to declare actions |
466 | inside Moose roles. |
85f0a66f |
467 | |
d935773d |
468 | =head2 Using Moose in Components |
469 | |
470 | The correct way to use Moose in a component in a both forward and backwards |
471 | compatible way is: |
472 | |
473 | package TestApp::Controller::Root; |
474 | use Moose; |
475 | BEGIN { extends 'Catalyst::Component' }; # Or ::Controller, or whatever |
476 | |
477 | See L<Components which inherit from Moose::Object before Catalyst::Component>. |
478 | |
8f61d649 |
479 | =head1 Known backwards compatibility breakages |
7e2ec16e |
480 | |
8f61d649 |
481 | =head2 Applications in a single file |
85f0a66f |
482 | |
483 | Applications must be in their own file, and loaded at compile time. This |
8f61d649 |
484 | issue generally only affects the tests of CPAN distributions. Your |
485 | application will fail if you try to define an application inline in a |
486 | block, and use plugins which supply a C< new > method, then use that |
487 | application latter in tests within the same file. |
85f0a66f |
488 | |
489 | This is due to the fact that Catalyst is inlining a new method on your |
8f61d649 |
490 | application class allowing it to be compatible with Moose. The method |
491 | used to do this changed in 5.80004 to avoid the possibility of reporting |
492 | an 'Unknown Error' if your application failed to compile. |
85f0a66f |
493 | |
38f90e49 |
494 | =head2 Issues with Class::C3 |
495 | |
8f61d649 |
496 | Catalyst 5.80 uses the L<Algorithm::C3> method dispatch order. This is |
497 | built into Perl 5.10, and comes via L<Class::C3> for Perl 5.8. This |
498 | replaces L<NEXT> with L<Class::C3::Adopt::NEXT>, forcing all components |
499 | to resolve methods using C3, rather than the unpredictable dispatch |
500 | order of L<NEXT>. |
38f90e49 |
501 | |
cf8eab35 |
502 | This issue manifests itself by your application failing to start due to an |
5d06547d |
503 | error message about having a non-linear @ISA. |
504 | |
8f61d649 |
505 | The Catalyst plugin most often causing this is |
506 | L<Catalyst::Plugin::Session::Store::FastMmap> - if you are using this |
507 | plugin and see issues, then please upgrade your plugins, as it has been |
508 | fixed. Note that Makefile.PL in the distribution will warn about known |
509 | incompatible components. |
5d06547d |
510 | |
511 | This issue can, however, be found in your own application - the only solution is |
512 | to go through each base class of the class the error was reported against, until |
513 | you identify the ones in conflict, and resolve them. |
514 | |
515 | To be able to generate a linear @ISA, the list of superclasses for each |
516 | class must be resolvable using the C3 algorithm. Unfortunately, when |
517 | superclasses are being used as mixins (to add functionality used in your class), |
ae7da8f5 |
518 | and with multiple inheritance, it is easy to get this wrong. |
38f90e49 |
519 | |
520 | Most common is the case of: |
521 | |
522 | package Component1; # Note, this is the common case |
523 | use base qw/Class::Accessor::Fast Class::Data::Inheritable/; |
524 | |
8f61d649 |
525 | package Component2; # Accidentally saying it this way causes a failure |
38f90e49 |
526 | use base qw/Class::Data::Inheritable Class::Accessor::Fast/; |
527 | |
528 | package GoesBang; |
529 | use base qw/Component1 Component2/; |
530 | |
5d06547d |
531 | Any situation like this will cause your application to fail to start. |
38f90e49 |
532 | |
8f61d649 |
533 | For additional documentation about this issue, and how to resolve it, see |
5d06547d |
534 | L<Class::C3::Adopt::NEXT>. |
38f90e49 |
535 | |
6f04e56a |
536 | =head2 Components which inherit from Moose::Object before Catalyst::Component |
7e2ec16e |
537 | |
6f04e56a |
538 | Moose components which say: |
7e2ec16e |
539 | |
6f04e56a |
540 | package TestApp::Controller::Example; |
541 | use Moose; |
845bfcd2 |
542 | extends qw/Moose::Object Catalyst::Component/; |
7e2ec16e |
543 | |
8f61d649 |
544 | to use the constructor provided by Moose, while working (if you do some hacks |
1a98f036 |
545 | with the C< BUILDARGS > method), will not work with Catalyst 5.80 as |
6f04e56a |
546 | C<Catalyst::Component> inherits from C<Moose::Object>, and so C< @ISA > fails |
25f61108 |
547 | to linearize. |
6f04e56a |
548 | |
6f04e56a |
549 | The correct way to use Moose in a component in a both forward and backwards |
550 | compatible way is: |
551 | |
552 | package TestApp::Controller::Root; |
553 | use Moose; |
554 | BEGIN { extends 'Catalyst::Component' }; # Or ::Controller, or whatever |
555 | |
ba03ccca |
556 | Note that the C< extends > declaration needs to occur in a begin block for |
3df46b1b |
557 | L<attributes> to operate correctly. |
558 | |
d935773d |
559 | This way you do not inherit directly from C<Moose::Object> |
560 | yourself. Having components which do not inherit their constructor from |
561 | C<Catalyst::Component> is B<unsupported>, and has never been recommended, |
562 | therefore you're on your own if you're using this technique. You'll need |
563 | to detect the version of Catalyst your application is running, and deal |
564 | with it appropriately. |
565 | |
eaae9a92 |
566 | You also don't get the L<Moose::Object> constructor, and therefore attribute |
567 | initialization will not work as normally expected. If you want to use Moose |
3df46b1b |
568 | attributes, then they need to be made lazy to correctly initialize. |
569 | |
570 | Note that this only applies if your component needs to maintain component |
571 | backwards compatibility for Catalyst versions before 5.71001 - in 5.71001 |
572 | attributes work as expected, and the BUILD method is called normally |
eaae9a92 |
573 | (although BUILDARGS is not). |
3df46b1b |
574 | |
575 | If you depend on Catalyst 5.8, then B<all> Moose features work as expected. |
8566c0de |
576 | |
d935773d |
577 | You will also see this issue if you do the following: |
578 | |
579 | package TestApp::Controller::Example; |
580 | use Moose; |
581 | use base 'Catalyst::Controller'; |
582 | |
583 | as C< use base > appends to @ISA. |
584 | |
e11cac87 |
585 | =head3 use Moose in MyApp |
586 | |
587 | Similar to the above, this will also fail: |
588 | |
589 | package MyApp; |
590 | use Moose; |
591 | use Catalyst qw/ |
592 | ConfigLoader |
593 | /; |
594 | __PACKAGE__->setup; |
595 | |
596 | If you need to use Moose in your application class (e.g. for method modifiers |
8f61d649 |
597 | etc.) then the correct technique is: |
e11cac87 |
598 | |
599 | package MyApp; |
600 | use Moose; |
5b6f82d2 |
601 | use Catalyst; |
602 | |
e11cac87 |
603 | extends 'Catalyst'; |
5b6f82d2 |
604 | |
605 | __PACKAGE__->config( name => 'MyApp' ); |
e11cac87 |
606 | __PACKAGE__->setup(qw/ |
607 | ConfigLoader |
608 | /); |
609 | |
04a48104 |
610 | =head2 Anonymous closures installed directly into the symbol table |
611 | |
612 | If you have any code which installs anonymous subroutine references directly |
613 | into the symbol table, you may encounter breakages. The simplest solution is |
614 | to use L<Sub::Name> to name the subroutine. Example: |
615 | |
e11cac87 |
616 | # Original code, likely to break: |
1a98f036 |
617 | my $full_method_name = join('::', $package_name, $method_name); |
04a48104 |
618 | *$full_method_name = sub { ... }; |
619 | |
e11cac87 |
620 | # Fixed Code |
04a48104 |
621 | use Sub::Name 'subname'; |
622 | my $full_method_name = join('::',$package_name, $method_name); |
623 | *$full_method_name = subname $full_method_name, sub { ... }; |
624 | |
8f61d649 |
625 | Additionally, you can take advantage of Catalyst's use of L<Class::MOP> and |
626 | install the closure using the appropriate metaclass. Example: |
04a48104 |
627 | |
628 | use Class::MOP; |
629 | my $metaclass = Moose::Meta::Class->initialize($package_name); |
630 | $metaclass->add_method($method_name => sub { ... }); |
631 | |
780654ad |
632 | =head2 Hooking into application setup |
633 | |
8f61d649 |
634 | To execute code during application start-up, the following snippet in MyApp.pm |
780654ad |
635 | used to work: |
636 | |
637 | sub setup { |
638 | my ($class, @args) = @_; |
639 | $class->NEXT::setup(@args); |
640 | ... # things to do after the actual setup |
641 | } |
642 | |
8f61d649 |
643 | With Catalyst 5.80 this won't work anymore, because Catalyst no longer |
644 | uses NEXT.pm for method resolution. The functionality was only ever |
645 | originally operational as L<NEXT> remembers what methods have already |
646 | been called, and will not call them again. |
780654ad |
647 | |
1a98f036 |
648 | Using this now causes infinite recursion between MyApp::setup and |
649 | Catalyst::setup, due to other backwards compatibility issues related to how |
e6c5b548 |
650 | plugin setup works. Moose method modifiers like C<< before|after|around setup |
1a98f036 |
651 | => sub { ... }; >> also will not operate correctly on the setup method. |
780654ad |
652 | |
653 | The right way to do it is this: |
654 | |
655 | after setup_finalize => sub { |
656 | ... # things to do after the actual setup |
657 | }; |
658 | |
ade00972 |
659 | The setup_finalize hook was introduced as a way to avoid this issue. |
1a98f036 |
660 | |
e11cac87 |
661 | =head2 Components with a new method which returns false |
7e2ec16e |
662 | |
8dd2f514 |
663 | Previously, if you had a component which inherited from Catalyst::COMPONENT, |
8f61d649 |
664 | but overrode the new method to return false, then your class's configuration |
8dd2f514 |
665 | would be blessed into a hash on your behalf, and this would be returned from |
a87f5aa5 |
666 | the COMPONENT method. |
7e2ec16e |
667 | |
8f61d649 |
668 | This behavior makes no sense, and so has been removed. Implementing your own |
669 | C< new > method in components is B<highly> discouraged. Instead, you should |
670 | inherit the new method from Catalyst::Component, and use Moose's BUILD |
1a98f036 |
671 | functionality and/or Moose attributes to perform any construction work |
672 | necessary for your class. |
7e2ec16e |
673 | |
674 | =head2 __PACKAGE__->mk_accessor('meta'); |
675 | |
e11cac87 |
676 | Won't work due to a limitation of L<Moose>. This is currently being fixed |
677 | inside Moose. |
7e2ec16e |
678 | |
679 | =head2 Class::Data::Inheritable side effects |
680 | |
8dd2f514 |
681 | Previously, writing to a class data accessor would copy the accessor method |
682 | down into your package. |
683 | |
8f61d649 |
684 | This behavior has been removed. While the class data is still stored |
8dd2f514 |
685 | per-class, it is stored on the metaclass of the class defining the accessor. |
7e2ec16e |
686 | |
8f61d649 |
687 | Therefore anything relying on the side effect of the accessor being copied down |
8dd2f514 |
688 | will be broken. |
7e2ec16e |
689 | |
1a98f036 |
690 | The following test demonstrates the problem: |
8dd2f514 |
691 | |
692 | { |
693 | package BaseClass; |
694 | use base qw/Class::Data::Inheritable/; |
695 | __PACKAGE__->mk_classdata('foo'); |
696 | } |
697 | |
698 | { |
699 | package Child; |
700 | use base qw/BaseClass/; |
701 | } |
702 | |
703 | BaseClass->foo('base class'); |
704 | Child->foo('sub class'); |
eaae9a92 |
705 | |
e11cac87 |
706 | use Test::More; |
8dd2f514 |
707 | isnt(BaseClass->can('foo'), Child->can('foo')); |
7e2ec16e |
708 | |
f4dda4a8 |
709 | =head2 Extending Catalyst::Request or other classes in an ad hoc manner using mk_accessors |
7e2ec16e |
710 | |
8dd2f514 |
711 | Previously, it was possible to add additional accessors to Catalyst::Request |
712 | (or other classes) by calling the mk_accessors class method. |
7e2ec16e |
713 | |
8f61d649 |
714 | This is no longer supported - users should make a subclass of the class whose |
715 | behavior they would like to change, rather than globally polluting the |
e11cac87 |
716 | Catalyst objects. |
8be895a7 |
717 | |
10011c19 |
718 | =head2 Confused multiple inheritance with Catalyst::Component::COMPONENT |
8be895a7 |
719 | |
8f61d649 |
720 | Previously, Catalyst's COMPONENT method would delegate to the method on |
721 | the right hand side, which could then delegate back again with |
722 | NEXT. This is poor practice, and in addition, makes no sense with C3 |
723 | method dispatch order, and is therefore no longer supported. |
bcc773b9 |
724 | |
ba03ccca |
725 | If a COMPONENT method is detected in the inheritance hierarchy to the right |
bcc773b9 |
726 | hand side of Catalyst::Component::COMPONENT, then the following warning |
727 | message will be emitted: |
7e2ec16e |
728 | |
8dd2f514 |
729 | There is a COMPONENT method resolving after Catalyst::Component |
5687c7f9 |
730 | in ${next_package}. |
8dd2f514 |
731 | |
8f61d649 |
732 | The correct fix is to re-arrange your class's inheritance hierarchy so that the |
bcc773b9 |
733 | COMPONENT method you would like to inherit is the first (left-hand most) |
734 | COMPONENT method in your @ISA. |
7e2ec16e |
735 | |
7e9340de |
736 | =head2 Development server relying on environment variables |
737 | |
738 | Previously, the development server would allow propagation of system |
739 | environment variables into the request environment, this has changed with the |
740 | adoption of Plack. You can use L<Plack::Middleware::ForceEnv> to achieve the |
741 | same effect. |
742 | |
c571d2c8 |
743 | =head1 WARNINGS |
744 | |
63b546b1 |
745 | =head2 Actions in your application class |
746 | |
747 | Having actions in your application class will now emit a warning at application |
e256d0e1 |
748 | startup as this is deprecated. It is highly recommended that these actions are moved |
63b546b1 |
749 | into a MyApp::Controller::Root (as demonstrated by the scaffold application |
5fa5b709 |
750 | generated by catalyst.pl). |
da73c6af |
751 | |
e256d0e1 |
752 | This warning, also affects tests. You should move actions in your test, |
753 | creating a myTest::Controller::Root, like the following example: |
da73c6af |
754 | |
755 | package MyTest::Controller::Root; |
95a52a01 |
756 | |
da73c6af |
757 | use strict; |
758 | use warnings; |
95a52a01 |
759 | |
da73c6af |
760 | use parent 'Catalyst::Controller'; |
95a52a01 |
761 | |
da73c6af |
762 | __PACKAGE__->config(namespace => ''); |
95a52a01 |
763 | |
da73c6af |
764 | sub action : Local { |
765 | my ( $self, $c ) = @_; |
5fa5b709 |
766 | $c->do_something; |
da73c6af |
767 | } |
95a52a01 |
768 | |
da73c6af |
769 | 1; |
63b546b1 |
770 | |
ac9279b0 |
771 | =head2 ::[MVC]:: naming scheme |
772 | |
773 | Having packages called MyApp::[MVC]::XX is deprecated and can no longer be generated |
774 | by catalyst.pl |
775 | |
776 | This is still supported, but it is recommended that you rename your application |
777 | components to Model/View/Controller. |
778 | |
779 | A warning will be issued at application startup if the ::[MVC]:: naming scheme is |
780 | in use. |
781 | |
ade00972 |
782 | =head2 Catalyst::Base |
783 | |
8f61d649 |
784 | Any code using L<Catalyst::Base> will now emit a warning; this |
785 | module will be removed in a future release. |
ade00972 |
786 | |
c571d2c8 |
787 | =head2 Methods in Catalyst::Dispatcher |
788 | |
8f61d649 |
789 | The following methods in Catalyst::Dispatcher are implementation |
790 | details, which may change in the 5.8X release series, and therefore their use |
bcc773b9 |
791 | is highly deprecated. |
c571d2c8 |
792 | |
793 | =over |
794 | |
8dd2f514 |
795 | =item tree |
c571d2c8 |
796 | |
8dd2f514 |
797 | =item dispatch_types |
c571d2c8 |
798 | |
8dd2f514 |
799 | =item registered_dispatch_types |
c571d2c8 |
800 | |
8dd2f514 |
801 | =item method_action_class |
c571d2c8 |
802 | |
8dd2f514 |
803 | =item action_hash |
c571d2c8 |
804 | |
805 | =item container_hash |
806 | |
807 | =back |
808 | |
809 | The first time one of these methods is called, a warning will be emitted: |
7e2ec16e |
810 | |
bcc773b9 |
811 | Class $class is calling the deprecated method Catalyst::Dispatcher::$public_method_name, |
dacd8b0e |
812 | this will be removed in Catalyst 5.9 |
7e2ec16e |
813 | |
c571d2c8 |
814 | You should B<NEVER> be calling any of these methods from application code. |
815 | |
8f61d649 |
816 | Plugin authors and maintainers whose plugins currently call these methods |
8f5a2bd9 |
817 | should change to using the public API, or, if you do not feel the public API |
8f61d649 |
818 | adequately supports your use case, please email the development list to |
8f5a2bd9 |
819 | discuss what API features you need so that you can be appropriately supported. |
7e2ec16e |
820 | |
95b20422 |
821 | =head2 Class files with names that don't correspond to the packages they define |
7e2ec16e |
822 | |
e11cac87 |
823 | In this version of Catalyst, if a component is loaded from disk, but no |
ba03ccca |
824 | symbols are defined in that component's name space after it is loaded, this |
bcc773b9 |
825 | warning will be issued: |
7e2ec16e |
826 | |
bcc773b9 |
827 | require $class was successful but the package is not defined. |
7e2ec16e |
828 | |
8f61d649 |
829 | This is to protect against confusing bugs caused by mistyping package names, |
bcc773b9 |
830 | and will become a fatal error in a future version. |
831 | |
832 | Please note that 'inner packages' (via L<Devel::InnerPackage>) are still fully |
8f61d649 |
833 | supported; this warning is only issued when component file naming does not map |
bcc773b9 |
834 | to B<any> of the packages defined within that component. |
7e2ec16e |
835 | |
5687c7f9 |
836 | =head2 $c->plugin method |
837 | |
25f61108 |
838 | Calling the plugin method is deprecated, and calling it at run time is B<highly |
8dd2f514 |
839 | deprecated>. |
7e2ec16e |
840 | |
95a52a01 |
841 | Instead you are recommended to use L<Catalyst::Model::Adaptor> or similar to |
ba03ccca |
842 | compose the functionality you need outside of the main application name space. |
7e2ec16e |
843 | |
4e68badc |
844 | Calling the plugin method will not be supported past Catalyst 5.81. |
bcc773b9 |
845 | |
7e2ec16e |
846 | =cut |
4e68badc |
847 | |