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1 | =head1 Upgrading to Catalyst 5.80 |
2 | |
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3 | Most applications and plugins should run unaltered on Catalyst 5.80. |
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4 | |
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5 | However as a lot of refactoring work has taken place, several changes |
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6 | have been made which could cause incompatibilities, if your application |
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7 | or plugin is using deprecated code, or relying on side-effects then |
8 | there could be incompatibility. |
9 | |
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10 | Most issues found with pre-existing components have been easy to solve, |
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11 | and a complete description of behavior changes which may cause compatibility |
12 | issues, or warnings to be emitted is included below to help if you have |
13 | problems. |
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14 | |
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15 | If you think you have found an upgrade related issue which is not covered in |
16 | this document, then please email the Catalyst list to discuss the problem. |
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17 | |
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18 | =head1 Known backwards compatibility breakages. |
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19 | |
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20 | =head2 Components which inherit from Moose::Object before Catalyst::Component |
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21 | |
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22 | Moose components which say: |
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23 | |
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24 | package TestApp::Controller::Example; |
25 | use Moose; |
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26 | extends qw/Moose::Object Catalyst::Component/; |
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27 | |
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28 | to use the constructor provided by Moose, whilst working if you do some hacks |
29 | with the C< BUILDARGS > method, will not work with Catalyst 5.80 as |
30 | C<Catalyst::Component> inherits from C<Moose::Object>, and so C< @ISA > fails |
31 | to linearise. |
32 | |
33 | The fix for this, is to not inherit directly from C<Moose::Object> |
34 | yourself. Having components which do not inherit their constructor from |
35 | C<Catalyst::Component> is B<unsupported>, and has never been recommended, |
36 | therefore you're on your own if you're using this technique. You'll need |
37 | to detect the version of Catalyst your application is running with and deal |
38 | with it appropriately. |
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39 | |
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40 | You will also see this issue if you do the following: |
41 | |
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42 | package TestApp::Controller::Example; |
43 | use Moose; |
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44 | use base 'Catalyst::Controller'; |
45 | |
46 | as C< use base > appends to @ISA. |
47 | |
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48 | The correct way to use Moose in a component in a both forward and backwards |
49 | compatible way is: |
50 | |
51 | package TestApp::Controller::Root; |
52 | use Moose; |
53 | BEGIN { extends 'Catalyst::Component' }; # Or ::Controller, or whatever |
54 | |
55 | Note that the C< extends > decleration needs to occur in a begin block for |
56 | L<attributes> to operate correctly. |
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57 | |
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58 | =head2 Anonymous closures installed directly into the symbol table |
59 | |
60 | If you have any code which installs anonymous subroutine references directly |
61 | into the symbol table, you may encounter breakages. The simplest solution is |
62 | to use L<Sub::Name> to name the subroutine. Example: |
63 | |
64 | #Originalcode, likely to break: |
65 | my $full_method_name = join('::',$package_name, $method_name); |
66 | *$full_method_name = sub { ... }; |
67 | |
68 | #Fixed Code |
69 | use Sub::Name 'subname'; |
70 | my $full_method_name = join('::',$package_name, $method_name); |
71 | *$full_method_name = subname $full_method_name, sub { ... }; |
72 | |
73 | Additionally, you can take advantage of Catalyst's use of L<Class::MOP> and |
74 | install the closure using the appropriate metaclass. Example: |
75 | |
76 | use Class::MOP; |
77 | my $metaclass = Moose::Meta::Class->initialize($package_name); |
78 | $metaclass->add_method($method_name => sub { ... }); |
79 | |
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80 | =head2 Hooking into application setup |
81 | |
82 | To execute code during application startup the following snippet in MyApp.pm |
83 | used to work: |
84 | |
85 | sub setup { |
86 | my ($class, @args) = @_; |
87 | $class->NEXT::setup(@args); |
88 | ... # things to do after the actual setup |
89 | } |
90 | |
91 | With Catalyst 5.80 this won't work anymore. Because instead of using NEXT.pm it |
92 | relies on Class::C3::Adopt::NEXT, which doesn't remember what methods it |
93 | already called, like NEXT does and therefore goes into a deep recursion between |
94 | MyApp::setup and Catalyst::setup. |
95 | |
96 | Moose method modifiers line C<< before|after|around 'setup => sub { ... }; >> |
97 | won't work either because of backward compatibility issues related to plugin |
98 | setup methods. |
99 | |
100 | The right way to do it is this: |
101 | |
102 | after setup_finalize => sub { |
103 | ... # things to do after the actual setup |
104 | }; |
105 | |
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106 | =head2 Components whos new method returns false |
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107 | |
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108 | Previously if your new method returned a false value, |
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109 | |
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110 | Previously, if you had a component which inherited from Catalyst::COMPONENT, but |
111 | overrode the new method, to return false, then your class' configuration would be blessed into a hash on your behalf, |
112 | and this would be returned from the COMPONENT method. T |
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113 | |
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114 | This behaviour makes no sense, and so has been removed.. You are recommended to implement your own new method |
115 | in components, instead, you should inherit the new method from Catalyst::Component, and use Moose's BUILD functionality |
116 | to perform any construction work necessary for your sub-class. |
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117 | |
118 | =head2 __PACKAGE__->mk_accessor('meta'); |
119 | |
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120 | Won't work due to a limitation of L<Moose> |
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121 | |
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122 | This is currently being fixed inside core Moose. |
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123 | |
124 | =head2 Class::Data::Inheritable side effects |
125 | |
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126 | Previously, writing to a class data accessor would copy the accessor method down into your package. |
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127 | |
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128 | This behavior has been removed. Whilst the class data is still stored per-class, it is stored on |
129 | the metaclass of the class defining the accessor. |
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130 | |
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131 | Therefore anything relying on the side-effect of the accessor being copied down will be broken. |
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132 | |
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133 | =head2 Extending Catalyst::Request or other classes in an ad-hoc manor using mk_accessors |
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134 | |
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135 | Previously, it was possible to add additional accessors to Catalyst::Request (or other classes) |
136 | by calling the mk_accessors class method. |
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137 | |
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138 | This is no longer supported - users should make a sub-class of the class who's behavior they would |
139 | like to change, rather than globally polluting the Catalyst objects. |
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140 | |
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141 | =head2 Confused multiple inheritance with Catalyst::Component::COMPONENT |
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142 | |
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143 | Warning message: |
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144 | |
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145 | There is a COMPONENT method resolving after Catalyst::Component |
146 | in ${next_package}. |
147 | |
148 | This means that one of the packages on the right hand side of |
149 | Catalyst::Component in your Class' inheritance hierarchy defines |
150 | a COMPONENT method. |
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151 | |
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152 | Previously, Catalyst's COMPONENT method would delegate to the |
153 | method on the right hand side, which could then delegate back again |
154 | with NEXT. This (as it is insane), is no longer supported, as it |
155 | makes no sense with C3 method dispatch order. |
156 | |
157 | Therefore the correct fix is to re-arrange your class' inheritance |
158 | hierarchy so that the COMPONENT method you would like to inherit is |
159 | the first COMPONENT method in your @ISA. |
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160 | |
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161 | =head2 Assigning lists to accessors |
162 | |
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163 | Accessors generated by Class::Accessor::Fast will, when multiple values |
164 | are assigned to them, store a reference to a list automatically for you. |
165 | |
166 | This is not currently supported by MooseX::Emulate::Class::Accessor::Fast, |
167 | and only the first value in the list will be stored. |
168 | |
169 | If you are relying on this behavior, and inheriting mk_accessors from a |
170 | Catalyst component, then your code will fail. |
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171 | |
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172 | =head1 WARNINGS |
173 | |
174 | =head2 Methods in Catalyst::Dispatcher |
175 | |
176 | The following methods in Catalyst::Dispatcher are likely to change |
177 | significantly in the 5.8X release series, and therefore their use is highly |
178 | deprecated. |
179 | |
180 | =over |
181 | |
182 | =item tree |
183 | |
184 | =item dispatch_types |
185 | |
186 | =item registered_dispatch_types |
187 | |
188 | =item method_action_class |
189 | |
190 | =item action_hash |
191 | |
192 | =item container_hash |
193 | |
194 | =back |
195 | |
196 | The first time one of these methods is called, a warning will be emitted: |
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197 | |
198 | Class $class is calling the deprecated method Catalyst::Dispatcher::$public_method_name,\n" |
199 | . "this will be removed in Catalyst 5.9X" |
200 | |
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201 | You should B<NEVER> be calling any of these methods from application code. |
202 | |
203 | Plugins authors and maintainers whos plugins need to call these methods |
204 | should email the development list to discuss your use-case, and what a |
205 | better API should look like. |
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206 | |
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207 | =head2 require $class was successful but the package is not defined. |
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208 | |
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209 | In this version of Catalyst, if a component is loaded from disk, but no symbols are defined in that component's namespace |
210 | after it is loaded, this warning will be issued. |
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211 | |
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212 | This is to protect against confusing bugs caused by mis-typing package names. |
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213 | |
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214 | This will become a fatal error in a future version. |
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215 | |
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216 | =head2 $c->plugin method |
217 | |
218 | Calling the plugin method is deprecated, and calling it at runtime is B<highly deprecated>. |
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219 | |
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220 | Instead you are recommended to use L< Catalyst::Model::Adaptor > or similar to compose the functionality |
221 | you need outside of the main application namespace. |
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222 | |
223 | =cut |