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Moose::Manual::Delta(3pm) User Contributed Perl Documentation Moose::Manual::Delta(3pm)
NAME
Moose::Manual::Delta - Important Changes in Moose
VERSION
version 2.2200
DESCRIPTION
This documents any important or noteworthy changes in Moose, with a focus on things that
affect backwards compatibility. This does duplicate data from the Changes file, but aims
to provide more details and when possible workarounds.
Besides helping keep up with changes, you can also use this document for finding the
lowest version of Moose that supported a given feature. If you encounter a problem and
have a solution but don't see it documented here, or think we missed an important feature,
please send us a patch.
2.1400
Overloading implementation has changed
Overloading meta information used to be implemented by a
"Class::MOP::Method::Overload" class. This class has been removed, and overloading is
now implemented by Class::MOP::Overload. Overloading is not really equivalent to a
method, so the former implementation didn't work properly for various cases.
All of the overloading-related methods for classes and roles have the same names, but
those methods now return Class::MOP::Overload objects.
Core support for overloading in roles
Roles which use overloading now pass that overloading onto other classes (and roles)
which consume that role.
This works much like MooseX::Role::WithOverloading, except that we properly detect
overloading conflicts during role summation and when applying one role to another.
MooseX::Role::WithOverloading did not do any conflict detection.
If you want to write code that uses overloading and works with previous versions of
Moose and this one, upgrade to MooseX::Role::WithOverloading version 0.15 or greater.
That version will detect when Moose itself handles overloading and get out of the way.
2.1200
Classes created by Moose are now registered in %INC
This means that this will no longer die (and will also no longer try to load
"Foo.pm"):
{
package Foo;
use Moose;
}
# ...
use Foo;
If you're using the MOP, this behavior will occur when the "create" (or
"create_anon_class") method is used, but not when the "initialize" method is used.
Moose now uses Module::Runtime instead of Class::Load to load classes
Class::Load has always had some weird issues with the ways that it tries to figure out
if a class is loaded. For instance, extending an empty package was previously
impossible, because Class::Load would think that the class failed to load, even though
that is a perfectly valid thing to do. It was also difficult to deal with modules like
IO::Handle, which partially populate several other packages when they are loaded (so
calling "load_class" on 'IO::Handle' followed by 'IO::File' could end up with a broken
"IO::File", in some cases).
Now, Moose uses the same mechanisms as perl itself to figure out if a class is loaded.
A class is considered to be loaded if its entry in %INC is set. Perl sets the %INC
entry for you automatically whenever a file is loaded via "use" or "require". Also, as
mentioned above, Moose also now sets the %INC entry for any classes defined with it,
even if they aren't loaded from a separate file. This does however mean that if you
are trying to use Moose with non-Moose classes defined in the same file, then you will
need to set %INC manually now, where it may have worked in the past. For instance:
{
package My::NonMoose;
sub new { bless {}, shift }
$INC{'My/NonMoose.pm'} = __FILE__;
# alternatively:
# use Module::Runtime 'module_notional_filename';
# $INC{module_notional_filename(__PACKAGE__)} = __FILE__;
}
{
package My::Moose;
use Moose;
extends 'My::NonMoose';
}
If you don't do this, you will get an error message about not being able to locate
"My::NonMoose" in @INC. We hope that this case will be fairly rare.
The Class::Load wrapper functions in Class::MOP have been deprecated
"Class::MOP::load_class", "Class::MOP::is_class_loaded", and
"Class::MOP::load_first_existing_class" have been deprecated. They have been
undocumented and discouraged since version 2.0200. You should replace their use with
the corresponding functions in Class::Load, or just use Module::Runtime directly.
The non-arrayref forms of "enum" and "duck_type" have been deprecated
Originally, "enum" could be called like this:
enum('MyType' => qw(foo bar baz))
This was confusing, however (since it was different from the syntax for anonymous enum
types), and it makes error checking more difficult (since you can't tell just by
looking whether "enum('Foo', 'Bar', 'Baz')" was intended to be a type named "Foo" with
elements of "Bar" and "Baz", or if this was actually a mistake where someone got the
syntax for an anonymous enum type wrong). This all also applies to "duck_type".
Calling "enum" and "duck_type" with a list of arguments as described above has been
undocumented since version 0.93, and is now deprecated. You should replace
enum MyType => qw(foo bar baz);
in your code with
enum MyType => [qw(foo bar baz)];
Moose string exceptions have been replaced by Moose exception objects
Previously, Moose threw string exceptions on error conditions, which were not so
verbose. All those string exceptions have now been converted to exception objects,
which provide very detailed information about the exceptions. These exception objects
provide a string overload that matches the previous exception message, so in most
cases you should not have to change your code.
For learning about the usage of Moose exception objects, read
Moose::Manual::Exceptions. Individual exceptions are documented in
Moose::Manual::Exceptions::Manifest.
This work was funded as part of the GNOME Outreach Program for Women.
2.1000
The Num type is now stricter
The "Num" type used to accept anything that fits Perl's notion of a number, which
included Inf, NaN, and strings like " 1234 \n". We believe that the type constraint
should indicate "this is a number", not "this coerces to a number". Therefore, Num
now only accepts integers, floating point numbers (both in decimal notation and
exponential notation), 0, .0, 0.0, etc.
If you want the old behavior you can use the "LaxNum" type in MooseX::Types::LaxNum.
You can use Specio instead of core Moose types
The Specio distribution is an experimental new type system intended to eventually
replace the core Moose types, but yet also work with things like Moo and Mouse and
anything else. Right now this is all speculative, but at least you can use Specio with
Moose.
2.0600
"->init_meta" is even less reliable at loading extensions
Previously, calling "MooseX::Foo->init_meta(@_)" (and nothing else) from within your
own "init_meta" had a decent chance of doing something useful. This was never
supported behavior, and didn't always work anyway. Due to some implementation
adjustments, this now has a smaller chance of doing something useful, which could
break code that was expecting it to continue doing useful things. Code that does this
should instead just call "MooseX::Foo->import({ into => $into })".
All the Cookbook recipes have been renamed
We've given them all descriptive names, rather than numbers. This makes it easier to
talk about them, and eliminates the need to renumber recipes in order to reorder them
or delete one.
2.0400
The parent of a union type is its components' nearest common ancestor
Previously, union types considered all of their component types their parent types.
This was incorrect because parent types are defined as types that must be satisfied in
order for the child type to be satisfied, but in a union, validating as any parent
type will validate against the entire union. This has been changed to find the nearest
common ancestor for all of its components. For example, a union of "Int|ArrayRef[Int]"
now has a parent of "Defined".
Union types consider all members in the "is_subtype_of" and "is_a_type_of" methods
Previously, a union type would report itself as being of a subtype of a type if any of
its member types were subtypes of that type. This was incorrect because any value that
passes a subtype constraint must also pass a parent constraint. This has changed so
that all of its member types must be a subtype of the specified type.
Enum types now work with just one value
Previously, an "enum" type needed to have two or more values. Nobody knew why, so we
fixed it.
Methods defined in UNIVERSAL now appear in the MOP
Any method introspection methods that look at methods from parent classes now find
methods defined in UNIVERSAL. This includes methods like "$class->get_all_methods" and
"$class->find_method_by_name".
This also means that you can now apply method modifiers to these methods.
Hand-optimized type constraint code causes a deprecation warning
If you provide an optimized sub ref for a type constraint, this now causes a
deprecation warning. Typically, this comes from passing an "optimize_as" parameter to
"subtype", but it could also happen if you create a Moose::Meta::TypeConstraint object
directly.
Use the inlining feature ("inline_as") added in 2.0100 instead.
"Class::Load::load_class" and "is_class_loaded" have been removed
The "Class::MOP::load_class" and "Class::MOP::is_class_loaded" subroutines are no
longer documented, and will cause a deprecation warning in the future. Moose now uses
Class::Load to provide this functionality, and you should do so as well.
2.0205
Array and Hash native traits provide a "shallow_clone" method
The Array and Hash native traits now provide a "shallow_clone" method, which will
return a reference to a new container with the same contents as the attribute's
reference.
2.0200
Hand-optimized type constraint code is deprecated in favor of inlining
Moose allows you to provide a hand-optimized version of a type constraint's subroutine
reference. This version allows type constraints to generate inline code, and you
should use this inlining instead of providing a hand-optimized subroutine reference.
This affects the "optimize_as" sub exported by Moose::Util::TypeConstraints. Use
"inline_as" instead.
This will start warning in the 2.0300 release.
2.0002
More useful type constraint error messages
If you have Devel::PartialDump version 0.14 or higher installed, Moose's type
constraint error messages will use it to display the invalid value, rather than just
displaying it directly. This will generally be much more useful. For instance, instead
of this:
Attribute (foo) does not pass the type constraint because: Validation failed for 'ArrayRef[Int]' with value ARRAY(0x275eed8)
the error message will instead look like
Attribute (foo) does not pass the type constraint because: Validation failed for 'ArrayRef[Int]' with value [ "a" ]
Note that Devel::PartialDump can't be made a direct dependency at the moment, because
it uses Moose itself, but we're considering options to make this easier.
2.0000
Roles have their own default attribute metaclass
Previously, when a role was applied to a class, it would use the attribute metaclass
defined in the class when copying over the attributes in the role. This was wrong,
because for instance, using MooseX::FollowPBP in the class would end up renaming all
of the accessors generated by the role, some of which may be being called in the role,
causing it to break. Roles now keep track of their own attribute metaclass to use by
default when being applied to a class (defaulting to Moose::Meta::Attribute). This is
modifiable using Moose::Util::MetaRole by passing the "applied_attribute" key to the
"role_metaroles" option, as in:
Moose::Util::MetaRole::apply_metaroles(
for => __PACKAGE__,
class_metaroles => {
attribute => ['My::Meta::Role::Attribute'],
},
role_metaroles => {
applied_attribute => ['My::Meta::Role::Attribute'],
},
);
Class::MOP has been folded into the Moose dist
Moose and Class::MOP are tightly related enough that they have always had to be kept
pretty closely in step in terms of versions. Making them into a single dist should
simplify the upgrade process for users, as it should no longer be possible to upgrade
one without the other and potentially cause issues. No functionality has changed, and
this should be entirely transparent.
Moose's conflict checking is more robust and useful
There are two parts to this. The most useful one right now is that Moose will ship
with a "moose-outdated" script, which can be run at any point to list the modules
which are installed that conflict with the installed version of Moose. After
upgrading Moose, running "moose-outdated | cpanm" should be sufficient to ensure that
all of the Moose extensions you use will continue to work.
The other part is that Moose's "META.json" file will also specify the conflicts under
the "x_conflicts" (now "x_breaks") key. We are working with the Perl tool chain
developers to try to get conflicts support added to CPAN clients, and if/when that
happens, the metadata already exists, and so the conflict checking will become
automatic.
The lazy_build attribute feature is discouraged
While not deprecated, we strongly discourage you from using this feature.
Most deprecated APIs/features are slated for removal in Moose 2.0200
Most of the deprecated APIs and features in Moose will start throwing an error in
Moose 2.0200. Some of the features will go away entirely, and some will simply throw
an error.
The things on the chopping block are:
o Old public methods in Class::MOP and Moose
This includes things like "Class::MOP::Class->get_attribute_map",
"Class::MOP::Class->construct_instance", and many others. These were
deprecated in Class::MOP 0.80_01, released on April 5, 2009.
These methods will be removed entirely in Moose 2.0200.
o Old public functions in Class::MOP
This include "Class::MOP::subname", "Class::MOP::in_global_destruction", and
the "Class::MOP::HAS_ISAREV" constant. The first two were deprecated in 0.84,
and the last in 0.80. Class::MOP 0.84 was released on May 12, 2009.
These functions will be removed entirely in Moose 2.0200.
o The "alias" and "excludes" option for role composition
These were renamed to "-alias" and "-excludes" in Moose 0.89, released on
August 13, 2009.
Passing these will throw an error in Moose 2.0200.
o The old Moose::Util::MetaRole API
This include the "apply_metaclass_roles()" function, as well as passing the
"for_class" or any key ending in "_roles" to "apply_metaroles()". This was
deprecated in Moose 0.93_01, released on January 4, 2010.
These will all throw an error in Moose 2.0200.
o Passing plain lists to "type()" or "subtype()"
The old API for these functions allowed you to pass a plain list of parameter,
rather than a list of hash references (which is what "as()", "where", etc.
return). This was deprecated in Moose 0.71_01, released on February 22, 2009.
This will throw an error in Moose 2.0200.
o The Role subtype
This subtype was deprecated in Moose 0.84, released on June 26, 2009.
This will be removed entirely in Moose 2.0200.
1.21
o New release policy
As of the 2.0 release, Moose now has an official release and support policy,
documented in Moose::Manual::Support. All API changes will now go through a
deprecation cycle of at least one year, after which the deprecated API can be removed.
Deprecations and removals will only happen in major releases.
In between major releases, we will still make minor releases to add new features, fix
bugs, update documentation, etc.
1.16
Configurable stacktraces
Classes which use the Moose::Error::Default error class can now have stacktraces
disabled by setting the "MOOSE_ERROR_STYLE" env var to "croak". This is experimental,
fairly incomplete, and won't work in all cases (because Moose's error system in
general is all of these things), but this should allow for reducing at least some of
the verbosity in most cases.
1.15
Native Delegations
In previous versions of Moose, the Native delegations were created as closures. The
generated code was often quite slow compared to doing the same thing by hand. For
example, the Array's push delegation ended up doing something like this:
push @{ $self->$reader() }, @_;
If the attribute was created without a reader, the $reader sub reference followed a
very slow code path. Even with a reader, this is still slower than it needs to be.
Native delegations are now generated as inline code, just like other accessors, so we
can access the slot directly.
In addition, native traits now do proper constraint checking in all cases. In
particular, constraint checking has been improved for array and hash references.
Previously, only the contained type (the "Str" in "HashRef[Str]") would be checked
when a new value was added to the collection. However, if there was a constraint that
applied to the whole value, this was never checked.
In addition, coercions are now called on the whole value.
The delegation methods now do more argument checking. All of the methods check that a
valid number of arguments were passed to the method. In addition, the delegation
methods check that the arguments are sane (array indexes, hash keys, numbers, etc.)
when applicable. We have tried to emulate the behavior of Perl builtins as much as
possible.
Finally, triggers are called whenever the value of the attribute is changed by a
Native delegation.
These changes are only likely to break code in a few cases.
The inlining code may or may not preserve the original reference when changes are
made. In some cases, methods which change the value may replace it entirely. This will
break tied values.
If you have a typed arrayref or hashref attribute where the type enforces a constraint
on the whole collection, this constraint will now be checked. It's possible that code
which previously ran without errors will now cause the constraint to fail. However,
presumably this is a good thing ;)
If you are passing invalid arguments to a delegation which were previously being
ignored, these calls will now fail.
If your code relied on the trigger only being called for a regular writer, that may
cause problems.
As always, you are encouraged to test before deploying the latest version of Moose to
production.
Defaults is and default for String, Counter, and Bool
A few native traits (String, Counter, Bool) provide default values of "is" and
"default" when you created an attribute. Allowing them to provide these values is now
deprecated. Supply the value yourself when creating the attribute.
The "meta" method
Moose and Class::MOP have been cleaned up internally enough to make the "meta" method
that you get by default optional. "use Moose" and "use Moose::Role" now can take an
additional "-meta_name" option, which tells Moose what name to use when installing the
"meta" method. Passing "undef" to this option suppresses generation of the "meta"
method entirely. This should be useful for users of modules which also use a "meta"
method or function, such as Curses or Rose::DB::Object.
1.09
All deprecated features now warn
Previously, deprecation mostly consisted of simply saying "X is deprecated" in the
Changes file. We were not very consistent about actually warning. Now, all deprecated
features still present in Moose actually give a warning. The warning is issued once
per calling package. See Moose::Deprecated for more details.
You cannot pass "coerce => 1" unless the attribute's type constraint has a coercion
Previously, this was accepted, and it sort of worked, except that if you attempted to
set the attribute after the object was created, you would get a runtime error.
Now you will get a warning when you attempt to define the attribute.
"no Moose", "no Moose::Role", and "no Moose::Exporter" no longer unimport strict and
warnings
This change was made in 1.05, and has now been reverted. We don't know if the user has
explicitly loaded strict or warnings on their own, and unimporting them is just broken
in that case.
Reversed logic when defining which options can be changed
Moose::Meta::Attribute now allows all options to be changed in an overridden
attribute. The previous behaviour required each option to be whitelisted using the
"legal_options_for_inheritance" method. This method has been removed, and there is a
new method, "illegal_options_for_inheritance", which can now be used to prevent
certain options from being changeable.
In addition, we only throw an error if the illegal option is actually changed. If the
superclass didn't specify this option at all when defining the attribute, the subclass
version can still add it as an option.
Example of overriding this in an attribute trait:
package Bar::Meta::Attribute;
use Moose::Role;
has 'my_illegal_option' => (
isa => 'CodeRef',
is => 'rw',
);
around illegal_options_for_inheritance => sub {
return ( shift->(@_), qw/my_illegal_option/ );
};
1.05
"BUILD" in Moose::Object methods are now called when calling "new_object"
Previously, "BUILD" methods would only be called from "Moose::Object::new", but now
they are also called when constructing an object via "Moose::Meta::Class::new_object".
"BUILD" methods are an inherent part of the object construction process, and this
should make "$meta->new_object" actually usable without forcing people to use
"$meta->name->new".
"no Moose", "no Moose::Role", and "no Moose::Exporter" now unimport strict and warnings
In the interest of having "no Moose" clean up everything that "use Moose" does in the
calling scope, "no Moose" (as well as all other Moose::Exporter-using modules) now
unimports strict and warnings.
Metaclass compatibility checking and fixing should be much more robust
The metaclass compatibility checking and fixing algorithms have been completely
rewritten, in both Class::MOP and Moose. This should resolve many confusing errors
when dealing with non-Moose inheritance and with custom metaclasses for things like
attributes, constructors, etc. For correct code, the only thing that should require a
change is that custom error metaclasses must now inherit from Moose::Error::Default.
1.02
Moose::Meta::TypeConstraint::Class is_subtype_of behavior
Earlier versions of is_subtype_of would incorrectly return true when called with
itself, its own TC name or its class name as an argument. (i.e.
$foo_tc->is_subtype_of('Foo') == 1) This behavior was a caused by "isa" being checked
before the class name. The old behavior can be accessed with is_type_of
1.00
Moose::Meta::Attribute::Native::Trait::Code no longer creates reader methods by default
Earlier versions of Moose::Meta::Attribute::Native::Trait::Code created read-only
accessors for the attributes it's been applied to, even if you didn't ask for it with
"is => 'ro'". This incorrect behaviour has now been fixed.
0.95
Moose::Util add_method_modifier behavior
add_method_modifier (and subsequently the sugar functions Moose::before, Moose::after,
and Moose::around) can now accept arrayrefs, with the same behavior as lists. Types
other than arrayref and regexp result in an error.
0.93_01 and 0.94
Moose::Util::MetaRole API has changed
The "apply_metaclass_roles" function is now called "apply_metaroles". The way
arguments are supplied has been changed to force you to distinguish between metaroles
applied to Moose::Meta::Class (and helpers) versus Moose::Meta::Role.
The old API still works, but will warn in a future release, and eventually be removed.
Moose::Meta::Role has real attributes
The attributes returned by Moose::Meta::Role are now instances of the
Moose::Meta::Role::Attribute class, instead of bare hash references.
"no Moose" now removes "blessed" and "confess"
Moose is now smart enough to know exactly what it exported, even when it re-exports
functions from other packages. When you unimport Moose, it will remove these functions
from your namespace unless you also imported them directly from their respective
packages.
If you have a "no Moose" in your code before you call "blessed" or "confess", your
code will break. You can either move the "no Moose" call later in your code, or
explicitly import the relevant functions from the packages that provide them.
Moose::Exporter is smarter about unimporting re-exports
The change above comes from a general improvement to Moose::Exporter. It will now
unimport any function it exports, even if that function is a re-export from another
package.
Attributes in roles can no longer override class attributes with "+foo"
Previously, this worked more or less accidentally, because role attributes weren't
objects. This was never documented, but a few MooseX modules took advantage of this.
The composition_class_roles attribute in Moose::Meta::Role is now a method
This was done to make it possible for roles to alter the list of composition class
roles by applying a method modifiers. Previously, this was an attribute and MooseX
modules override it. Since that no longer works, this was made a method.
This should be an attribute, so this may switch back to being an attribute in the
future if we can figure out how to make this work.
0.93
Calling $object->new() is no longer deprecated
We decided to undeprecate this. Now it just works.
Both "get_method_map" and "get_attribute_map" is deprecated
These metaclass methods were never meant to be public, and they are both now
deprecated. The work around if you still need the functionality they provided is to
iterate over the list of names manually.
my %fields = map { $_ => $meta->get_attribute($_) } $meta->get_attribute_list;
This was actually a change in Class::MOP, but this version of Moose requires a version
of Class::MOP that includes said change.
0.90
Added Native delegation for Code refs
See Moose::Meta::Attribute::Native::Trait::Code for details.
Calling $object->new() is deprecated
Moose has long supported this, but it's never really been documented, and we don't
think this is a good practice. If you want to construct an object from an existing
object, you should provide some sort of alternate constructor like "$object->clone".
Calling "$object->new" now issues a warning, and will be an error in a future release.
Moose no longer warns if you call "make_immutable" for a class with mutable ancestors
While in theory this is a good thing to warn about, we found so many exceptions to
this that doing this properly became quite problematic.
0.89_02
New Native delegation methods from List::Util and List::MoreUtils
In particular, we now have "reduce", "shuffle", "uniq", and "natatime".
The Moose::Exporter with_caller feature is now deprecated
Use "with_meta" instead. The "with_caller" option will start warning in a future
release.
Moose now warns if you call "make_immutable" for a class with mutable ancestors
This is dangerous because modifying a class after a subclass has been immutabilized
will lead to incorrect results in the subclass, due to inlining, caching, etc. This
occasionally happens accidentally, when a class loads one of its subclasses in the
middle of its class definition, so pointing out that this may cause issues should be
helpful. Metaclasses (classes that inherit from Class::MOP::Object) are currently
exempt from this check, since at the moment we aren't very consistent about which
metaclasses we immutabilize.
"enum" and "duck_type" now take arrayrefs for all forms
Previously, calling these functions with a list would take the first element of the
list as the type constraint name, and use the remainder as the enum values or method
names. This makes the interface inconsistent with the anon-type forms of these
functions (which must take an arrayref), and a free-form list where the first value is
sometimes special is hard to validate (and harder to give reasonable error messages
for). These functions have been changed to take arrayrefs in all their forms - so,
"enum 'My::Type' => [qw(foo bar)]" is now the preferred way to create an enum type
constraint. The old syntax still works for now, but it will hopefully be deprecated
and removed in a future release.
0.89_01
Moose::Meta::Attribute::Native has been moved into the Moose core from
MooseX::AttributeHelpers. Major changes include:
"traits", not "metaclass"
Method providers are only available via traits.
"handles", not "provides" or "curries"
The "provides" syntax was like core Moose "handles => HASHREF" syntax, but with the
keys and values reversed. This was confusing, and AttributeHelpers now uses "handles
=> HASHREF" in a way that should be intuitive to anyone already familiar with how it
is used for other attributes.
The "curries" functionality provided by AttributeHelpers has been generalized to apply
to all cases of "handles => HASHREF", though not every piece of functionality has been
ported (currying with a CODEREF is not supported).
"empty" is now "is_empty", and means empty, not non-empty
Previously, the "empty" method provided by Arrays and Hashes returned true if the
attribute was not empty (no elements). Now it returns true if the attribute is empty.
It was also renamed to "is_empty", to reflect this.
"find" was renamed to "first", and "first" and "last" were removed
List::Util refers to the functionality that we used to provide under "find" as first,
so that will likely be more familiar (and will fit in better if we decide to add more
List::Util functions). "first" and "last" were removed, since their functionality is
easily duplicated with curries of "get".
Helpers that take a coderef of one argument now use $_
Subroutines passed as the first argument to "first", "map", and "grep" now receive
their argument in $_ rather than as a parameter to the subroutine. Helpers that take
a coderef of two or more arguments remain using the argument list (there are technical
limitations to using $a and $b like "sort" does).
See Moose::Meta::Attribute::Native for the new documentation.
The "alias" and "excludes" role parameters have been renamed to "-alias" and "-excludes".
The old names still work, but new code should use the new names, and eventually the old
ones will be deprecated and removed.
0.89
"use Moose -metaclass => 'Foo'" now does alias resolution, just like "-traits" (and the
"metaclass" and "traits" options to "has").
Added two functions "meta_class_alias" and "meta_attribute_alias" to Moose::Util, to
simplify aliasing metaclasses and metatraits. This is a wrapper around the old
package Moose::Meta::Class::Custom::Trait::FooTrait;
sub register_implementation { 'My::Meta::Trait' }
way of doing this.
0.84
When an attribute generates no accessors, we now warn. This is to help users who forget
the "is" option. If you really do not want any accessors, you can use "is => 'bare'". You
can maintain back compat with older versions of Moose by using something like:
($Moose::VERSION >= 0.84 ? is => 'bare' : ())
When an accessor overwrites an existing method, we now warn. To work around this warning
(if you really must have this behavior), you can explicitly remove the method before
creating it as an accessor:
sub foo {}
__PACKAGE__->meta->remove_method('foo');
has foo => (
is => 'ro',
);
When an unknown option is passed to "has", we now warn. You can silence the warning by
fixing your code. :)
The "Role" type has been deprecated. On its own, it was useless, since it just checked
"$object->can('does')". If you were using it as a parent type, just call
"role_type('Role::Name')" to create an appropriate type instead.
0.78
"use Moose::Exporter;" now imports "strict" and "warnings" into packages that use it.
0.77
"DEMOLISHALL" and "DEMOLISH" now receive an argument indicating whether or not we are in
global destruction.
0.76
Type constraints no longer run coercions for a value that already matches the constraint.
This may affect some (arguably buggy) edge case coercions that rely on side effects in the
"via" clause.
0.75
Moose::Exporter now accepts the "-metaclass" option for easily overriding the metaclass
(without metaclass). This works for classes and roles.
0.74
Added a "duck_type" sugar function to Moose::Util::TypeConstraints to make integration
with non-Moose classes easier. It simply checks if "$obj->can()" a list of methods.
A number of methods (mostly inherited from Class::MOP) have been renamed with a leading
underscore to indicate their internal-ness. The old method names will still work for a
while, but will warn that the method has been renamed. In a few cases, the method will be
removed entirely in the future. This may affect MooseX authors who were using these
methods.
0.73
Calling "subtype" with a name as the only argument now throws an exception. If you want an
anonymous subtype do:
my $subtype = subtype as 'Foo';
This is related to the changes in version 0.71_01.
The "is_needed" method in Moose::Meta::Method::Destructor is now only usable as a class
method. Previously, it worked as a class or object method, with a different internal
implementation for each version.
The internals of making a class immutable changed a lot in Class::MOP 0.78_02, and Moose's
internals have changed along with it. The external "$metaclass->make_immutable" method
still works the same way.
0.72
A mutable class accepted "Foo->new(undef)" without complaint, while an immutable class
would blow up with an unhelpful error. Now, in both cases we throw a helpful error
instead.
This "feature" was originally added to allow for cases such as this:
my $args;
if ( something() ) {
$args = {...};
}
return My::Class->new($args);
But we decided this is a bad idea and a little too magical, because it can easily mask
real errors.
0.71_01
Calling "type" or "subtype" without the sugar helpers ("as", "where", "message") is now
deprecated.
As a side effect, this meant we ended up using Perl prototypes on "as", and code like this
will no longer work:
use Moose::Util::TypeConstraints;
use Declare::Constraints::Simple -All;
subtype 'ArrayOfInts'
=> as 'ArrayRef'
=> IsArrayRef(IsInt);
Instead it must be changed to this:
subtype(
'ArrayOfInts' => {
as => 'ArrayRef',
where => IsArrayRef(IsInt)
}
);
If you want to maintain backwards compat with older versions of Moose, you must explicitly
test Moose's "VERSION":
if ( Moose->VERSION < 0.71_01 ) {
subtype 'ArrayOfInts'
=> as 'ArrayRef'
=> IsArrayRef(IsInt);
}
else {
subtype(
'ArrayOfInts' => {
as => 'ArrayRef',
where => IsArrayRef(IsInt)
}
);
}
0.70
We no longer pass the meta-attribute object as a final argument to triggers. This actually
changed for inlined code a while back, but the non-inlined version and the docs were still
out of date.
If by some chance you actually used this feature, the workaround is simple. You fetch the
attribute object from out of the $self that is passed as the first argument to trigger,
like so:
has 'foo' => (
is => 'ro',
isa => 'Any',
trigger => sub {
my ( $self, $value ) = @_;
my $attr = $self->meta->find_attribute_by_name('foo');
# ...
}
);
0.66
If you created a subtype and passed a parent that Moose didn't know about, it simply
ignored the parent. Now it automatically creates the parent as a class type. This may not
be what you want, but is less broken than before.
You could declare a name with subtype such as "Foo!Bar". Moose would accept this allowed,
but if you used it in a parameterized type such as "ArrayRef[Foo!Bar]" it wouldn't work.
We now do some vetting on names created via the sugar functions, so that they can only
contain alphanumerics, ":", and ".".
0.65
Methods created via an attribute can now fulfill a "requires" declaration for a role.
Honestly we don't know why Stevan didn't make this work originally, he was just insane or
something.
Stack traces from inlined code will now report the line and file as being in your class,
as opposed to in Moose guts.
0.62_02
When a class does not provide all of a role's required methods, the error thrown now
mentions all of the missing methods, as opposed to just the first missing method.
Moose will no longer inline a constructor for your class unless it inherits its
constructor from Moose::Object, and will warn when it doesn't inline. If you want to force
inlining anyway, pass "replace_constructor => 1" to "make_immutable".
If you want to get rid of the warning, pass "inline_constructor => 0".
0.62
Removed the (deprecated) "make_immutable" keyword.
Removing an attribute from a class now also removes delegation ("handles") methods
installed for that attribute. This is correct behavior, but if you were wrongly relying on
it you might get bit.
0.58
Roles now add methods by calling "add_method", not "alias_method". They make sure to
always provide a method object, which will be cloned internally. This means that it is now
possible to track the source of a method provided by a role, and even follow its history
through intermediate roles. This means that methods added by a role now show up when
looking at a class's method list/map.
Parameter and Union args are now sorted, this makes Int|Str the same constraint as
Str|Int. Also, incoming type constraint strings are normalized to remove all whitespace
differences. This is mostly for internals and should not affect outside code.
Moose::Exporter will no longer remove a subroutine that the exporting package re-exports.
Moose re-exports the Carp::confess function, among others. The reasoning is that we cannot
know whether you have also explicitly imported those functions for your own use, so we err
on the safe side and always keep them.
0.56
"Moose::init_meta" should now be called as a method.
New modules for extension writers, Moose::Exporter and Moose::Util::MetaRole.
0.55_01
Implemented metaclass traits (and wrote a recipe for it):
use Moose -traits => 'Foo'
This should make writing small Moose extensions a little easier.
0.55
Fixed "coerce" to accept anon types just like "subtype" can. So that you can do:
coerce $some_anon_type => from 'Str' => via { ... };
0.51
Added "BUILDARGS", a new step in "Moose::Object->new()".
0.49
Fixed how the "is => (ro|rw)" works with custom defined "reader", "writer" and "accessor"
options. See the below table for details:
is => ro, writer => _foo # turns into (reader => foo, writer => _foo)
is => rw, writer => _foo # turns into (reader => foo, writer => _foo)
is => rw, accessor => _foo # turns into (accessor => _foo)
is => ro, accessor => _foo # error, accesor is rw
0.45
The "before/around/after" method modifiers now support regexp matching of method names.
NOTE: this only works for classes, it is currently not supported in roles, but, ...
patches welcome.
The "has" keyword for roles now accepts the same array ref form that Moose.pm does for
classes.
A trigger on a read-only attribute is no longer an error, as it's useful to trigger off of
the constructor.
Subtypes of parameterizable types now are parameterizable types themselves.
0.44
Fixed issue where "DEMOLISHALL" was eating the value in $@, and so not working correctly.
It still kind of eats them, but so does vanilla perl.
0.41
Inherited attributes may now be extended without restriction on the type ('isa', 'does').
The entire set of Moose::Meta::TypeConstraint::* classes were refactored in this release.
If you were relying on their internals you should test your code carefully.
0.40
Documenting the use of '+name' with attributes that come from recently composed roles. It
makes sense, people are using it, and so why not just officially support it.
The "Moose::Meta::Class->create" method now supports roles.
It is now possible to make anonymous enum types by passing "enum" an array reference
instead of the "enum $name => @values".
0.37
Added the "make_immutable" keyword as a shortcut to calling "make_immutable" on the meta
object. This eventually got removed!
Made "init_arg => undef" work in Moose. This means "do not accept a constructor parameter
for this attribute".
Type errors now use the provided message. Prior to this release they didn't.
0.34
Moose is now a postmodern object system :)
The Role system was completely refactored. It is 100% backwards compat, but the internals
were totally changed. If you relied on the internals then you are advised to test
carefully.
Added method exclusion and aliasing for Roles in this release.
Added the Moose::Util::TypeConstraints::OptimizedConstraints module.
Passing a list of values to an accessor (which is only expecting one value) used to be
silently ignored, now it throws an error.
0.26
Added parameterized types and did a pretty heavy refactoring of the type constraint
system.
Better framework extensibility and better support for "making your own Moose".
0.25 or before
Honestly, you shouldn't be using versions of Moose that are this old, so many bug fixes
and speed improvements have been made you would be crazy to not upgrade.
Also, I am tired of going through the Changelog so I am stopping here, if anyone would
like to continue this please feel free.
AUTHORS
o Stevan Little <stevan AT cpan.org>
o Dave Rolsky <autarch AT urth.org>
o Jesse Luehrs <doy AT cpan.org>
o Shawn M Moore <sartak AT cpan.org>
o ' (Yuval Kogman) <nothingmuch AT woobling.org>
o Karen Etheridge <ether AT cpan.org>
o Florian Ragwitz <rafl AT debian.org>
o Hans Dieter Pearcey <hdp AT cpan.org>
o Chris Prather <chris AT prather.org>
o Matt S Trout <mstrout AT cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2006 by Infinity Interactive, Inc.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.
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Under GNU General Public License
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