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1 | =pod |
2 | |
3 | =head1 NAME |
4 | |
5 | Moose::Manual::Delta - Important Changes in Moose |
6 | |
7 | =head1 DESCRIPTION |
8 | |
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9 | This documents any important or noteworthy changes in Moose, with a |
10 | focus on backwards. This does duplicate data from the F<Changes> file, |
11 | but aims to provide more details and when possible workarounds. |
12 | |
13 | Besides helping keep up with changes, you can also use this document |
14 | for finding the lowest version of Moose that supported a given |
15 | feature. If you encounter a problem and have a solution but don't see |
16 | it documented here, or think we missed an important feature, please |
17 | send us a patch. |
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18 | |
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19 | =head1 Version 0.89 |
20 | |
21 | C<< use Moose -metaclass => 'Foo' >> now does alias resolution, just like |
22 | C<-traits> (and the C<metaclass> and C<traits> options to C<has>). |
23 | |
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24 | Added two functions C<meta_class_alias> and C<meta_attribute_alias> to |
25 | L<Moose::Util>, to simplify aliasing metaclasses and metatraits. This is |
26 | a wrapper around the old |
27 | |
28 | package Moose::Meta::Class::Custom::Trait::FooTrait; |
29 | sub register_implementation { 'My::Meta::Trait' } |
30 | |
31 | way of doing this. |
32 | |
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33 | =head1 Version 0.84 |
34 | |
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35 | When an attribute generates I<no> accessors, we now warn. This is to help |
36 | users who forget the C<is> option. If you really do not want any accessors, |
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37 | you can use C<< is => 'bare' >>. You can maintain back compat with older |
38 | versions of Moose by using something like: |
39 | |
40 | ($Moose::VERSION >= 0.84 ? is => 'bare' : ()) |
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41 | |
42 | When an accessor overwrites an existing method, we now warn. To work around |
43 | this warning (if you really must have this behavior), you can explicitly |
44 | remove the method before creating it as an accessor: |
45 | |
46 | sub foo {} |
47 | |
48 | __PACKAGE__->meta->remove_method('foo'); |
49 | |
50 | has foo => ( |
51 | is => 'ro', |
52 | ); |
53 | |
54 | When an unknown option is passed to C<has>, we now warn. You can silence |
55 | the warning by fixing your code. :) |
56 | |
4831e2de |
57 | The C<Role> type has been deprecated. On its own, it was useless, |
58 | since it just checked C<< $object->can('does') >>. If you were using |
59 | it as a parent type, just call C<role_type('Role::Name')> to create an |
60 | appropriate type instead. |
61 | |
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62 | =head1 Version 0.78 |
63 | |
64 | C<use Moose::Exporter;> now imports C<strict> and C<warnings> into packages |
65 | that use it. |
66 | |
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67 | =head1 Version 0.77 |
68 | |
69 | C<DEMOLISHALL> and C<DEMOLISH> now receive an argument indicating whether or |
70 | not we are in global destruction. |
71 | |
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72 | =head1 Version 0.76 |
73 | |
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74 | Type constraints no longer run coercions for a value that already matches the |
75 | constraint. This may affect some (arguably buggy) edge case coercions that |
76 | rely on side effects in the C<via> clause. |
77 | |
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78 | =head1 Version 0.75 |
79 | |
80 | L<Moose::Exporter> now accepts the C<-metaclass> option for easily |
81 | overriding the metaclass (without L<metaclass>). This works for classes |
82 | and roles. |
83 | |
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84 | =head1 Version 0.74 |
85 | |
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86 | Added a C<duck_type> sugar function to L<Moose::Util::TypeConstraints> |
87 | to make integration with non-Moose classes easier. It simply checks if |
88 | C<< $obj->can() >> a list of methods. |
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89 | |
612fd754 |
90 | A number of methods (mostly inherited from L<Class::MOP>) have been |
91 | renamed with a leading underscore to indicate their internal-ness. The |
92 | old method names will still work for a while, but will warn that the |
93 | method has been renamed. In a few cases, the method will be removed |
94 | entirely in the future. This may affect MooseX authors who were using |
95 | these methods. |
96 | |
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97 | =head1 Version 0.73 |
98 | |
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99 | Calling C<subtype> with a name as the only argument now throws an |
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100 | exception. If you want an anonymous subtype do: |
101 | |
102 | my $subtype = subtype as 'Foo'; |
103 | |
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104 | This is related to the changes in version 0.71_01. |
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105 | |
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106 | The C<is_needed> method in L<Moose::Meta::Method::Destructor> is now |
107 | only usable as a class method. Previously, it worked as a class or |
108 | object method, with a different internal implementation for each |
109 | version. |
110 | |
111 | The internals of making a class immutable changed a lot in Class::MOP |
112 | 0.78_02, and Moose's internals have changed along with it. The |
113 | external C<< $metaclass->make_immutable >> method still works the same |
114 | way. |
115 | |
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116 | =head1 Version 0.72 |
117 | |
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118 | A mutable class accepted C<< Foo->new(undef) >> without complaint, |
119 | while an immutable class would blow up with an unhelpful error. Now, |
120 | in both cases we throw a helpful error instead. |
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121 | |
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122 | This "feature" was originally added to allow for cases such as this: |
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123 | |
124 | my $args; |
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125 | |
126 | if ( something() ) { |
127 | $args = {...}; |
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128 | } |
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129 | |
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130 | return My::Class->new($args); |
131 | |
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132 | But we decided this is a bad idea and a little too magical, because it |
133 | can easily mask real errors. |
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134 | |
135 | =head1 Version 0.71_01 |
136 | |
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137 | Calling C<type> or C<subtype> without the sugar helpers (C<as>, |
138 | C<where>, C<message>) is now deprecated. |
139 | |
140 | As a side effect, this meant we ended up using Perl prototypes on |
141 | C<as>, and code like this will no longer work: |
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142 | |
143 | use Moose::Util::TypeConstraints; |
144 | use Declare::Constraints::Simple -All; |
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145 | |
146 | subtype 'ArrayOfInts' |
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147 | => as 'ArrayRef' |
148 | => IsArrayRef(IsInt); |
149 | |
150 | Instead it must be changed to this: |
151 | |
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152 | subtype( |
153 | 'ArrayOfInts' => { |
154 | as => 'ArrayRef', |
155 | where => IsArrayRef(IsInt) |
156 | } |
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157 | ); |
158 | |
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159 | If you want to maintain backwards compat with older versions of Moose, |
160 | you must explicitly test Moose's C<VERSION>: |
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161 | |
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162 | if ( Moose->VERSION < 0.71_01 ) { |
163 | subtype 'ArrayOfInts' |
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164 | => as 'ArrayRef' |
165 | => IsArrayRef(IsInt); |
166 | } |
167 | else { |
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168 | subtype( |
169 | 'ArrayOfInts' => { |
170 | as => 'ArrayRef', |
171 | where => IsArrayRef(IsInt) |
172 | } |
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173 | ); |
174 | } |
175 | |
176 | =head1 Version 0.70 |
177 | |
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178 | We no longer pass the meta-attribute object as a final argument to |
179 | triggers. This actually changed for inlined code a while back, but the |
180 | non-inlined version and the docs were still out of date. |
181 | |
182 | If by some chance you actually used this feature, the workaround is |
183 | simple. You fetch the attribute object from out of the C<$self> |
184 | that is passed as the first argument to trigger, like so: |
185 | |
186 | has 'foo' => ( |
187 | is => 'ro', |
188 | isa => 'Any', |
189 | trigger => sub { |
190 | my ( $self, $value ) = @_; |
191 | my $attr = $self->meta->find_attribute_by_name('foo'); |
192 | |
193 | # ... |
194 | } |
195 | ); |
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196 | |
197 | =head1 Version 0.66 |
198 | |
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199 | If you created a subtype and passed a parent that Moose didn't know |
200 | about, it simply ignored the parent. Now it automatically creates the |
201 | parent as a class type. This may not be what you want, but is less |
202 | broken than before. |
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203 | |
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204 | You could declare a name with subtype such as "Foo!Bar". Moose would |
205 | accept this allowed, but if you used it in a parameterized type such |
206 | as "ArrayRef[Foo!Bar]" it wouldn't work. We now do some vetting on |
207 | names created via the sugar functions, so that they can only contain |
208 | alphanumerics, ":", and ".". |
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209 | |
210 | =head1 Version 0.65 |
211 | |
212 | Methods created via an attribute can now fulfill a C<requires> |
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213 | declaration for a role. Honestly we don't know why Stevan didn't make |
214 | this work originally, he was just insane or something. |
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215 | |
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216 | Stack traces from inlined code will now report the line and file as |
217 | being in your class, as opposed to in Moose guts. |
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218 | |
219 | =head1 Version 0.62_02 |
220 | |
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221 | When a class does not provide all of a role's required methods, the |
222 | error thrown now mentions all of the missing methods, as opposed to |
223 | just the first missing method. |
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224 | |
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225 | Moose will no longer inline a constructor for your class unless it |
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226 | inherits its constructor from Moose::Object, and will warn when it |
227 | doesn't inline. If you want to force inlining anyway, pass |
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228 | C<< replace_constructor => 1 >> to C<make_immutable>. |
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229 | |
230 | If you want to get rid of the warning, pass C<< inline_constructor => |
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231 | 0 >>. |
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232 | |
233 | =head1 Version 0.62 |
234 | |
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235 | Removed the (deprecated) C<make_immutable> keyword. |
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236 | |
237 | Removing an attribute from a class now also removes delegation |
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238 | (C<handles>) methods installed for that attribute. This is correct |
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239 | behavior, but if you were wrongly relying on it you might get bit. |
240 | |
241 | =head1 Version 0.58 |
242 | |
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243 | Roles now add methods by calling C<add_method>, not |
244 | C<alias_method>. They make sure to always provide a method object, |
245 | which will be cloned internally. This means that it is now possible to |
246 | track the source of a method provided by a role, and even follow its |
247 | history through intermediate roles. This means that methods added by |
248 | a role now show up when looking at a class's method list/map. |
249 | |
250 | Parameter and Union args are now sorted, this makes Int|Str the same |
251 | constraint as Str|Int. Also, incoming type constraint strings are |
252 | normalized to remove all whitespace differences. This is mostly for |
253 | internals and should not affect outside code. |
254 | |
255 | L<Moose::Exporter> will no longer remove a subroutine that the |
256 | exporting package re-exports. Moose re-exports the Carp::confess |
257 | function, among others. The reasoning is that we cannot know whether |
258 | you have also explicitly imported those functions for your own use, so |
259 | we err on the safe side and always keep them. |
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260 | |
261 | =head1 Version 0.56 |
262 | |
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263 | C<Moose::init_meta> should now be called as a method. |
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264 | |
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265 | New modules for extension writers, L<Moose::Exporter> and |
266 | L<Moose::Util::MetaRole>. |
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267 | |
268 | =head1 Version 0.55_01 |
269 | |
270 | Implemented metaclass traits (and wrote a recipe for it): |
271 | |
272 | use Moose -traits => 'Foo' |
273 | |
274 | This should make writing small Moose extensions a little |
275 | easier. |
276 | |
277 | =head1 Version 0.55 |
278 | |
279 | Fixed C<coerce> to accept anon types just like C<subtype> can. |
280 | So that you can do: |
281 | |
282 | coerce $some_anon_type => from 'Str' => via { ... }; |
283 | |
284 | =head1 Version 0.51 |
285 | |
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286 | Added C<BUILDARGS>, a new step in C<< Moose::Object->new() >>. |
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287 | |
288 | =head1 Version 0.49 |
289 | |
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290 | Fixed how the C<< is => (ro|rw) >> works with custom defined |
291 | C<reader>, C<writer> and C<accessor> options. See the below table for |
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292 | details: |
293 | |
294 | is => ro, writer => _foo # turns into (reader => foo, writer => _foo) |
295 | is => rw, writer => _foo # turns into (reader => foo, writer => _foo) |
296 | is => rw, accessor => _foo # turns into (accessor => _foo) |
297 | is => ro, accessor => _foo # error, accesor is rw |
298 | |
299 | =head1 Version 0.45 |
300 | |
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301 | The C<before/around/after> method modifiers now support regexp |
302 | matching of method names. NOTE: this only works for classes, it is |
303 | currently not supported in roles, but, ... patches welcome. |
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304 | |
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305 | The C<has> keyword for roles now accepts the same array ref form that |
306 | L<Moose>.pm does for classes. |
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307 | |
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308 | A trigger on a read-only attribute is no longer an error, as it's |
309 | useful to trigger off of the constructor. |
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310 | |
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311 | Subtypes of parameterizable types now are parameterizable types |
312 | themselves. |
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313 | |
314 | =head1 Version 0.44 |
315 | |
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316 | Fixed issue where C<DEMOLISHALL> was eating the value in C<$@>, and so |
317 | not working correctly. It still kind of eats them, but so does vanilla |
318 | perl. |
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319 | |
320 | =head1 Version 0.41 |
321 | |
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322 | Inherited attributes may now be extended without restriction on the |
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323 | type ('isa', 'does'). |
324 | |
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325 | The entire set of Moose::Meta::TypeConstraint::* classes were |
326 | refactored in this release. If you were relying on their internals you |
327 | should test your code carefully. |
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328 | |
329 | =head1 Version 0.40 |
330 | |
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331 | Documenting the use of '+name' with attributes that come from recently |
332 | composed roles. It makes sense, people are using it, and so why not |
333 | just officially support it. |
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334 | |
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335 | The C<< Moose::Meta::Class->create >> method now supports roles. |
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336 | |
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337 | It is now possible to make anonymous enum types by passing C<enum> an |
338 | array reference instead of the C<< enum $name => @values >>. |
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339 | |
340 | =head1 Version 0.37 |
341 | |
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342 | Added the C<make_immutable> keyword as a shortcut to calling |
343 | C<make_immutable> on the meta object. This eventually got removed! |
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344 | |
0f13f53c |
345 | Made C<< init_arg => undef >> work in Moose. This means "do not accept |
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346 | a constructor parameter for this attribute". |
347 | |
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348 | Type errors now use the provided message. Prior to this release they |
349 | didn't. |
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350 | |
351 | =head1 Version 0.34 |
352 | |
353 | Moose is now a postmodern object system :) |
354 | |
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355 | The Role system was completely refactored. It is 100% backwards |
356 | compat, but the internals were totally changed. If you relied on the |
357 | internals then you are advised to test carefully. |
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358 | |
359 | Added method exclusion and aliasing for Roles in this release. |
360 | |
0f13f53c |
361 | Added the L<Moose::Util::TypeConstraints::OptimizedConstraints> |
362 | module. |
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363 | |
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364 | Passing a list of values to an accessor (which is only expecting one |
365 | value) used to be silently ignored, now it throws an error. |
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366 | |
367 | =head1 Version 0.26 |
368 | |
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369 | Added parameterized types and did a pretty heavy refactoring of the |
370 | type constraint system. |
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371 | |
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372 | Better framework extendability and better support for "making your own |
373 | Moose". |
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374 | |
375 | =head1 Version 0.25 or before |
376 | |
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377 | Honestly, you shouldn't be using versions of Moose that are this old, |
378 | so many bug fixes and speed improvements have been made you would be |
379 | crazy to not upgrade. |
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380 | |
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381 | Also, I am tired of going through the Changelog so I am stopping here, |
382 | if anyone would like to continue this please feel free. |
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383 | |
384 | =head1 AUTHOR |
385 | |
386 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
387 | |
388 | =head1 COPYRIGHT AND LICENSE |
389 | |
390 | Copyright 2009 by Infinity Interactive, Inc. |
391 | |
392 | L<http://www.iinteractive.com> |
393 | |
394 | This library is free software; you can redistribute it and/or modify |
395 | it under the same terms as Perl itself. |
396 | |
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397 | =cut |