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1 | =head1 NAME |
2 | |
3 | Catalyst::Upgrading - Instructions for upgrading to the latest Catalyst |
4 | |
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5 | =head1 Upgrading to Catalyst 5.90 |
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6 | |
7 | The major change is that L<Plack> now replaces most of the subclasses of |
8 | L<Catalyst::Engine>. If you are using one of the standard subclasses of |
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9 | L<Catalyst::Engine> this should be a straightforward upgrade for you. It was |
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10 | a design goal for this release to be as backwardly compatible as possible. |
11 | However since L<Plack> is different from L<Catalyst::Engine> it would be |
12 | possible that edge case differences would exist. Therefore we recommend care |
13 | be taken with this upgrade and that testing should be greater than would be |
14 | the case with a minor point update. |
15 | |
16 | It is highly recommended that you become familar with the L<Plack> ecosystem |
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17 | and documentation. Being able to take advantage of L<Plack> development and |
18 | middleware is a major bonus to this upgrade. Documentation about how to |
19 | take advantage of L<Plack::Middleware> by writing your own C<< .psgi >> file |
20 | is contained in L<Catalyst::PSGI>. |
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21 | |
22 | If you have created a custom subclass of L<Catalyst:Engine> you will need to |
23 | convert it to be a subclass of L<Plack::Handler>. |
24 | |
25 | If you are using the L<Plack> engine, L<Catalyst::Engine::PSGI>, this new |
26 | release supercedes that code. |
27 | |
28 | If you are using a subclass of L<Catalyst::Engine> that is aimed at nonstandard |
29 | or internal / testing uses, such as L<Catalyst::Engine::Embeddable> you should |
30 | still be able to continue using that engine. |
31 | |
32 | Advice for specific subclasses of L<Catalyst::Engine> follows: |
33 | |
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34 | =head2 Upgrading the FastCGI Engine |
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35 | |
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36 | No upgrade needed if your myapp_fastcgi.pl script is already upgraded |
37 | enough to use L<Catalyst::Script::FastCGI>. |
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38 | |
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39 | =head2 Upgrading the mod_perl / Apache Engines |
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40 | |
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41 | The engines that are build upon the various iterations of mod_perl, |
42 | L<Catalyst::Engine::Apache::MP13> and |
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43 | L<Catalyst::Engine::Apache2::MP20> should be seemless upgrades and will |
44 | work using using L<Plack::Handler::Apache1> or L<Plack::Handler::Apache2> |
45 | as required. |
46 | |
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47 | L<Catalyst::Engine::Apache2::MP19>, is however no longer supported, as Plack |
48 | does not support mod_perl version 1.99??? FIXME - is this true? |
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49 | |
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50 | =head2 Upgrading the HTTP Engine |
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51 | |
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52 | The default development server that comes with the L<Catalyst> distribution |
53 | should continue to work as expected with no changes as long as your C<myapp_server> |
54 | script is upgraded to use L<Catalyst::Script::HTTP>. |
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55 | |
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56 | =head2 Upgrading the CGI Engine |
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57 | |
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58 | If you were using L<Catalyst::Engine::CGI> there is no upgrade needed if your |
59 | myapp_cgi.pl script is already upgraded enough to use L<Catalyst::Script::CGI>. |
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60 | |
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61 | =head2 Upgrading the Preforking Engine |
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62 | |
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63 | If you were using L<Catalyst::Engine::HTTP::Prefork> then L<Starman> |
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64 | is automatically loaded. |
65 | |
66 | XXX FIXME - note how to run Starman with different options. |
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67 | |
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68 | =head2 Upgrading the PSGI Engine |
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69 | |
70 | If you were using L<Catalyst::Engine::PSGI> this new release supercedes this |
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71 | engine in supporting L<Plack>. By default the Engine is now always L<Plack>. |
72 | As a result, you can stop depending on L<Catalyst::Engine::PSGI> in your |
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73 | C<Makefile.PL>. |
74 | |
75 | Applications that were using L<Catalyst::Engine::PSGI> |
76 | previously should entirely continue to work in this release with no changes. |
77 | |
78 | However, if you have an C<app.psgi> script, then you no longer |
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79 | need to specify the PSGI engine. Instead, the L<Catalyst> application class |
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80 | now has a new method C<psgi_app> which returns a L<PSGI> compatible coderef |
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81 | which you can wrap in middleware of your choice. |
82 | |
83 | Catalyst will use the .psgi for your application if it is located in the C<home> |
84 | directory of the application |
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85 | |
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86 | For example, if you were using L<Catalyst::Engine::PSGI> in the past, you will |
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87 | have written (or generated) a C<script/myapp.psgi> file similar to this one: |
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88 | |
89 | use Plack::Builder; |
90 | use MyCatalytApp; |
91 | |
92 | MyCatalystApp->setup_engine('PSGI'); |
93 | |
94 | builder { |
95 | enable ... # enable your desired middleware |
96 | sub { MyCatalystApp->run(@_) }; |
97 | }; |
98 | |
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99 | Instead, you now say: |
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100 | |
101 | use Plack::Builder; |
102 | use MyCatalystApp; |
103 | |
104 | builder { |
105 | enable ... #enable your desired middleware |
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106 | MyCatalystApp->psgi_app; |
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107 | }; |
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108 | |
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109 | And also rename C<< script/myapp.psgi >> to C<< myapp.psgi >>. |
110 | |
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111 | XXX - FIXME - t/psgi_file_testapp_engine_psgi_compat.t |
112 | |
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113 | If you rename your .psgi file without these modifications, then any tests run via |
114 | L<Catalyst::Test> will not be compatible with the new release, and will result in |
115 | the development server starting, rather than the expected test running. |
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116 | |
117 | =head2 Engines which are known broken |
118 | |
119 | The following engines B<DO NOT> work as of Catalyst version 5.90. The core |
120 | team is extremely happy to work with the developers and/or users of these |
121 | engines to help them port to the new Plack/Engine system, however applications |
122 | which are currently using these engines B<WILL NOT> run without modification |
123 | to the engine code. |
124 | |
125 | =over |
126 | |
127 | =item Catalyst::Engine::Wx |
128 | |
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129 | =item Catalyst::Engine::Zeus |
130 | |
131 | =item Catalyst::Engine::JobQueue::POE |
132 | |
133 | =item Catalyst::Engine::XMPP2 |
134 | |
135 | =item Catalyst::Engine::SCGI |
136 | |
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137 | =back |
138 | |
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139 | =head2 Engines with unknown status |
140 | |
141 | The following engines have untested or unknown compatibility. Reports are |
142 | highly welcomed: |
143 | |
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144 | =over |
145 | |
146 | =item Catalyst::Engine::Mojo |
147 | |
148 | =item Catalyst::Engine::Server (Marked as Deprecated) |
149 | |
150 | =item Catalyst::Engine::HTTP::POE (Marked as Deprecated) |
151 | |
152 | =back |
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153 | |
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154 | =head2 Using middleware |
155 | |
156 | XXX Should this be here or elsewhere? |
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157 | |
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158 | =head2 Making an app.psgi file |
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159 | |
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160 | =head2 Running with plackup? |
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161 | |
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162 | =head1 Upgrading to Catalyst 5.80 |
163 | |
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164 | Most applications and plugins should run unaltered on Catalyst 5.80. |
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165 | |
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166 | However, a lot of refactoring work has taken place, and several changes have |
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167 | been made which could cause incompatibilities. If your application or plugin |
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168 | is using deprecated code, or relying on side effects, then you could have |
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169 | issues upgrading to this release. |
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170 | |
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171 | Most issues found with pre-existing components have been easy to |
172 | solve. This document provides a complete description of behavior changes |
173 | which may cause compatibility issues, and of new Catalyst warnings which |
174 | be unclear. |
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175 | |
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176 | If you think you have found an upgrade-related issue which is not covered in |
177 | this document, please email the Catalyst list to discuss the problem. |
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178 | |
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179 | =head1 Moose features |
180 | |
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181 | =head2 Application class roles |
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182 | |
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183 | You can only apply method modifiers after the application's C<< ->setup >> |
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184 | method has been called. This means that modifiers will not work with methods |
185 | which run during the call to C<< ->setup >>. |
186 | |
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187 | See L<Catalyst::Manual::ExtendingCatalyst> for more information about using |
188 | L<Moose> in your applications. |
189 | |
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190 | =head2 Controller actions in Moose roles |
191 | |
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192 | You can use L<MooseX::MethodAttributes::Role> if you want to declare actions |
193 | inside Moose roles. |
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194 | |
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195 | =head2 Using Moose in Components |
196 | |
197 | The correct way to use Moose in a component in a both forward and backwards |
198 | compatible way is: |
199 | |
200 | package TestApp::Controller::Root; |
201 | use Moose; |
202 | BEGIN { extends 'Catalyst::Component' }; # Or ::Controller, or whatever |
203 | |
204 | See L<Components which inherit from Moose::Object before Catalyst::Component>. |
205 | |
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206 | =head1 Known backwards compatibility breakages |
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207 | |
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208 | =head2 Applications in a single file |
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209 | |
210 | Applications must be in their own file, and loaded at compile time. This |
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211 | issue generally only affects the tests of CPAN distributions. Your |
212 | application will fail if you try to define an application inline in a |
213 | block, and use plugins which supply a C< new > method, then use that |
214 | application latter in tests within the same file. |
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215 | |
216 | This is due to the fact that Catalyst is inlining a new method on your |
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217 | application class allowing it to be compatible with Moose. The method |
218 | used to do this changed in 5.80004 to avoid the possibility of reporting |
219 | an 'Unknown Error' if your application failed to compile. |
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220 | |
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221 | =head2 Issues with Class::C3 |
222 | |
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223 | Catalyst 5.80 uses the L<Algorithm::C3> method dispatch order. This is |
224 | built into Perl 5.10, and comes via L<Class::C3> for Perl 5.8. This |
225 | replaces L<NEXT> with L<Class::C3::Adopt::NEXT>, forcing all components |
226 | to resolve methods using C3, rather than the unpredictable dispatch |
227 | order of L<NEXT>. |
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228 | |
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229 | This issue is characterised by your application failing to start due to an |
230 | error message about having a non-linear @ISA. |
231 | |
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232 | The Catalyst plugin most often causing this is |
233 | L<Catalyst::Plugin::Session::Store::FastMmap> - if you are using this |
234 | plugin and see issues, then please upgrade your plugins, as it has been |
235 | fixed. Note that Makefile.PL in the distribution will warn about known |
236 | incompatible components. |
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237 | |
238 | This issue can, however, be found in your own application - the only solution is |
239 | to go through each base class of the class the error was reported against, until |
240 | you identify the ones in conflict, and resolve them. |
241 | |
242 | To be able to generate a linear @ISA, the list of superclasses for each |
243 | class must be resolvable using the C3 algorithm. Unfortunately, when |
244 | superclasses are being used as mixins (to add functionality used in your class), |
245 | and with multiple inheritence, it is easy to get this wrong. |
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246 | |
247 | Most common is the case of: |
248 | |
249 | package Component1; # Note, this is the common case |
250 | use base qw/Class::Accessor::Fast Class::Data::Inheritable/; |
251 | |
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252 | package Component2; # Accidentally saying it this way causes a failure |
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253 | use base qw/Class::Data::Inheritable Class::Accessor::Fast/; |
254 | |
255 | package GoesBang; |
256 | use base qw/Component1 Component2/; |
257 | |
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258 | Any situation like this will cause your application to fail to start. |
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259 | |
8f61d649 |
260 | For additional documentation about this issue, and how to resolve it, see |
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261 | L<Class::C3::Adopt::NEXT>. |
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262 | |
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263 | =head2 Components which inherit from Moose::Object before Catalyst::Component |
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264 | |
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265 | Moose components which say: |
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266 | |
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267 | package TestApp::Controller::Example; |
268 | use Moose; |
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269 | extends qw/Moose::Object Catalyst::Component/; |
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270 | |
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271 | to use the constructor provided by Moose, while working (if you do some hacks |
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272 | with the C< BUILDARGS > method), will not work with Catalyst 5.80 as |
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273 | C<Catalyst::Component> inherits from C<Moose::Object>, and so C< @ISA > fails |
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274 | to linearize. |
6f04e56a |
275 | |
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276 | The correct way to use Moose in a component in a both forward and backwards |
277 | compatible way is: |
278 | |
279 | package TestApp::Controller::Root; |
280 | use Moose; |
281 | BEGIN { extends 'Catalyst::Component' }; # Or ::Controller, or whatever |
282 | |
ba03ccca |
283 | Note that the C< extends > declaration needs to occur in a begin block for |
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284 | L<attributes> to operate correctly. |
285 | |
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286 | This way you do not inherit directly from C<Moose::Object> |
287 | yourself. Having components which do not inherit their constructor from |
288 | C<Catalyst::Component> is B<unsupported>, and has never been recommended, |
289 | therefore you're on your own if you're using this technique. You'll need |
290 | to detect the version of Catalyst your application is running, and deal |
291 | with it appropriately. |
292 | |
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293 | You also don't get the L<Moose::Object> constructor, and therefore attribute |
294 | initialization will not work as normally expected. If you want to use Moose |
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295 | attributes, then they need to be made lazy to correctly initialize. |
296 | |
297 | Note that this only applies if your component needs to maintain component |
298 | backwards compatibility for Catalyst versions before 5.71001 - in 5.71001 |
299 | attributes work as expected, and the BUILD method is called normally |
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300 | (although BUILDARGS is not). |
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301 | |
302 | If you depend on Catalyst 5.8, then B<all> Moose features work as expected. |
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303 | |
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304 | You will also see this issue if you do the following: |
305 | |
306 | package TestApp::Controller::Example; |
307 | use Moose; |
308 | use base 'Catalyst::Controller'; |
309 | |
310 | as C< use base > appends to @ISA. |
311 | |
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312 | =head3 use Moose in MyApp |
313 | |
314 | Similar to the above, this will also fail: |
315 | |
316 | package MyApp; |
317 | use Moose; |
318 | use Catalyst qw/ |
319 | ConfigLoader |
320 | /; |
321 | __PACKAGE__->setup; |
322 | |
323 | If you need to use Moose in your application class (e.g. for method modifiers |
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324 | etc.) then the correct technique is: |
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325 | |
326 | package MyApp; |
327 | use Moose; |
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328 | use Catalyst; |
329 | |
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330 | extends 'Catalyst'; |
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331 | |
332 | __PACKAGE__->config( name => 'MyApp' ); |
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333 | __PACKAGE__->setup(qw/ |
334 | ConfigLoader |
335 | /); |
336 | |
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337 | =head2 Anonymous closures installed directly into the symbol table |
338 | |
339 | If you have any code which installs anonymous subroutine references directly |
340 | into the symbol table, you may encounter breakages. The simplest solution is |
341 | to use L<Sub::Name> to name the subroutine. Example: |
342 | |
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343 | # Original code, likely to break: |
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344 | my $full_method_name = join('::', $package_name, $method_name); |
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345 | *$full_method_name = sub { ... }; |
346 | |
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347 | # Fixed Code |
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348 | use Sub::Name 'subname'; |
349 | my $full_method_name = join('::',$package_name, $method_name); |
350 | *$full_method_name = subname $full_method_name, sub { ... }; |
351 | |
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352 | Additionally, you can take advantage of Catalyst's use of L<Class::MOP> and |
353 | install the closure using the appropriate metaclass. Example: |
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354 | |
355 | use Class::MOP; |
356 | my $metaclass = Moose::Meta::Class->initialize($package_name); |
357 | $metaclass->add_method($method_name => sub { ... }); |
358 | |
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359 | =head2 Hooking into application setup |
360 | |
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361 | To execute code during application start-up, the following snippet in MyApp.pm |
780654ad |
362 | used to work: |
363 | |
364 | sub setup { |
365 | my ($class, @args) = @_; |
366 | $class->NEXT::setup(@args); |
367 | ... # things to do after the actual setup |
368 | } |
369 | |
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370 | With Catalyst 5.80 this won't work anymore, because Catalyst no longer |
371 | uses NEXT.pm for method resolution. The functionality was only ever |
372 | originally operational as L<NEXT> remembers what methods have already |
373 | been called, and will not call them again. |
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374 | |
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375 | Using this now causes infinite recursion between MyApp::setup and |
376 | Catalyst::setup, due to other backwards compatibility issues related to how |
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377 | plugin setup works. Moose method modifiers like C<< before|after|around setup |
1a98f036 |
378 | => sub { ... }; >> also will not operate correctly on the setup method. |
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379 | |
380 | The right way to do it is this: |
381 | |
382 | after setup_finalize => sub { |
383 | ... # things to do after the actual setup |
384 | }; |
385 | |
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386 | The setup_finalize hook was introduced as a way to avoid this issue. |
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387 | |
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388 | =head2 Components with a new method which returns false |
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389 | |
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390 | Previously, if you had a component which inherited from Catalyst::COMPONENT, |
8f61d649 |
391 | but overrode the new method to return false, then your class's configuration |
8dd2f514 |
392 | would be blessed into a hash on your behalf, and this would be returned from |
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393 | the COMPONENT method. |
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394 | |
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395 | This behavior makes no sense, and so has been removed. Implementing your own |
396 | C< new > method in components is B<highly> discouraged. Instead, you should |
397 | inherit the new method from Catalyst::Component, and use Moose's BUILD |
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398 | functionality and/or Moose attributes to perform any construction work |
399 | necessary for your class. |
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400 | |
401 | =head2 __PACKAGE__->mk_accessor('meta'); |
402 | |
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403 | Won't work due to a limitation of L<Moose>. This is currently being fixed |
404 | inside Moose. |
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405 | |
406 | =head2 Class::Data::Inheritable side effects |
407 | |
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408 | Previously, writing to a class data accessor would copy the accessor method |
409 | down into your package. |
410 | |
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411 | This behavior has been removed. While the class data is still stored |
8dd2f514 |
412 | per-class, it is stored on the metaclass of the class defining the accessor. |
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413 | |
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414 | Therefore anything relying on the side effect of the accessor being copied down |
8dd2f514 |
415 | will be broken. |
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416 | |
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417 | The following test demonstrates the problem: |
8dd2f514 |
418 | |
419 | { |
420 | package BaseClass; |
421 | use base qw/Class::Data::Inheritable/; |
422 | __PACKAGE__->mk_classdata('foo'); |
423 | } |
424 | |
425 | { |
426 | package Child; |
427 | use base qw/BaseClass/; |
428 | } |
429 | |
430 | BaseClass->foo('base class'); |
431 | Child->foo('sub class'); |
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432 | |
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433 | use Test::More; |
8dd2f514 |
434 | isnt(BaseClass->can('foo'), Child->can('foo')); |
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435 | |
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436 | =head2 Extending Catalyst::Request or other classes in an ad-hoc manner using mk_accessors |
7e2ec16e |
437 | |
8dd2f514 |
438 | Previously, it was possible to add additional accessors to Catalyst::Request |
439 | (or other classes) by calling the mk_accessors class method. |
7e2ec16e |
440 | |
8f61d649 |
441 | This is no longer supported - users should make a subclass of the class whose |
442 | behavior they would like to change, rather than globally polluting the |
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443 | Catalyst objects. |
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444 | |
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445 | =head2 Confused multiple inheritance with Catalyst::Component::COMPONENT |
8be895a7 |
446 | |
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447 | Previously, Catalyst's COMPONENT method would delegate to the method on |
448 | the right hand side, which could then delegate back again with |
449 | NEXT. This is poor practice, and in addition, makes no sense with C3 |
450 | method dispatch order, and is therefore no longer supported. |
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451 | |
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452 | If a COMPONENT method is detected in the inheritance hierarchy to the right |
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453 | hand side of Catalyst::Component::COMPONENT, then the following warning |
454 | message will be emitted: |
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455 | |
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456 | There is a COMPONENT method resolving after Catalyst::Component |
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457 | in ${next_package}. |
8dd2f514 |
458 | |
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459 | The correct fix is to re-arrange your class's inheritance hierarchy so that the |
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460 | COMPONENT method you would like to inherit is the first (left-hand most) |
461 | COMPONENT method in your @ISA. |
7e2ec16e |
462 | |
c571d2c8 |
463 | =head1 WARNINGS |
464 | |
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465 | =head2 Actions in your application class |
466 | |
467 | Having actions in your application class will now emit a warning at application |
e256d0e1 |
468 | startup as this is deprecated. It is highly recommended that these actions are moved |
63b546b1 |
469 | into a MyApp::Controller::Root (as demonstrated by the scaffold application |
55dd186c |
470 | generated by catalyst.pl). |
da73c6af |
471 | |
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472 | This warning, also affects tests. You should move actions in your test, |
473 | creating a myTest::Controller::Root, like the following example: |
da73c6af |
474 | |
475 | package MyTest::Controller::Root; |
95a52a01 |
476 | |
da73c6af |
477 | use strict; |
478 | use warnings; |
95a52a01 |
479 | |
da73c6af |
480 | use parent 'Catalyst::Controller'; |
95a52a01 |
481 | |
da73c6af |
482 | __PACKAGE__->config(namespace => ''); |
95a52a01 |
483 | |
da73c6af |
484 | sub action : Local { |
485 | my ( $self, $c ) = @_; |
486 | $c->do_something; |
487 | } |
95a52a01 |
488 | |
da73c6af |
489 | 1; |
63b546b1 |
490 | |
ac9279b0 |
491 | =head2 ::[MVC]:: naming scheme |
492 | |
493 | Having packages called MyApp::[MVC]::XX is deprecated and can no longer be generated |
494 | by catalyst.pl |
495 | |
496 | This is still supported, but it is recommended that you rename your application |
497 | components to Model/View/Controller. |
498 | |
499 | A warning will be issued at application startup if the ::[MVC]:: naming scheme is |
500 | in use. |
501 | |
ade00972 |
502 | =head2 Catalyst::Base |
503 | |
8f61d649 |
504 | Any code using L<Catalyst::Base> will now emit a warning; this |
505 | module will be removed in a future release. |
ade00972 |
506 | |
c571d2c8 |
507 | =head2 Methods in Catalyst::Dispatcher |
508 | |
8f61d649 |
509 | The following methods in Catalyst::Dispatcher are implementation |
510 | details, which may change in the 5.8X release series, and therefore their use |
bcc773b9 |
511 | is highly deprecated. |
c571d2c8 |
512 | |
513 | =over |
514 | |
8dd2f514 |
515 | =item tree |
c571d2c8 |
516 | |
8dd2f514 |
517 | =item dispatch_types |
c571d2c8 |
518 | |
8dd2f514 |
519 | =item registered_dispatch_types |
c571d2c8 |
520 | |
8dd2f514 |
521 | =item method_action_class |
c571d2c8 |
522 | |
8dd2f514 |
523 | =item action_hash |
c571d2c8 |
524 | |
525 | =item container_hash |
526 | |
527 | =back |
528 | |
529 | The first time one of these methods is called, a warning will be emitted: |
7e2ec16e |
530 | |
bcc773b9 |
531 | Class $class is calling the deprecated method Catalyst::Dispatcher::$public_method_name, |
532 | this will be removed in Catalyst 5.9X |
7e2ec16e |
533 | |
c571d2c8 |
534 | You should B<NEVER> be calling any of these methods from application code. |
535 | |
8f61d649 |
536 | Plugin authors and maintainers whose plugins currently call these methods |
8f5a2bd9 |
537 | should change to using the public API, or, if you do not feel the public API |
8f61d649 |
538 | adequately supports your use case, please email the development list to |
8f5a2bd9 |
539 | discuss what API features you need so that you can be appropriately supported. |
7e2ec16e |
540 | |
95b20422 |
541 | =head2 Class files with names that don't correspond to the packages they define |
7e2ec16e |
542 | |
e11cac87 |
543 | In this version of Catalyst, if a component is loaded from disk, but no |
ba03ccca |
544 | symbols are defined in that component's name space after it is loaded, this |
bcc773b9 |
545 | warning will be issued: |
7e2ec16e |
546 | |
bcc773b9 |
547 | require $class was successful but the package is not defined. |
7e2ec16e |
548 | |
8f61d649 |
549 | This is to protect against confusing bugs caused by mistyping package names, |
bcc773b9 |
550 | and will become a fatal error in a future version. |
551 | |
552 | Please note that 'inner packages' (via L<Devel::InnerPackage>) are still fully |
8f61d649 |
553 | supported; this warning is only issued when component file naming does not map |
bcc773b9 |
554 | to B<any> of the packages defined within that component. |
7e2ec16e |
555 | |
5687c7f9 |
556 | =head2 $c->plugin method |
557 | |
25f61108 |
558 | Calling the plugin method is deprecated, and calling it at run time is B<highly |
8dd2f514 |
559 | deprecated>. |
7e2ec16e |
560 | |
95a52a01 |
561 | Instead you are recommended to use L<Catalyst::Model::Adaptor> or similar to |
ba03ccca |
562 | compose the functionality you need outside of the main application name space. |
7e2ec16e |
563 | |
4e68badc |
564 | Calling the plugin method will not be supported past Catalyst 5.81. |
bcc773b9 |
565 | |
7e2ec16e |
566 | =cut |
4e68badc |
567 | |