Moose: inherited attributes

rootcho has asked for the wisdom of the Perl Monks concerning the following question:

Brand new installation .. trying to run my app, but it blows up with the error below.
As you may deduce I have a attribute 'obj_templates' in the parent class and then in the ansestor I override it with '+obj_templates' declaration.
The same app work OK on a different machines with Moose ver : 1.21 and 2.08

What look suspicious to me is this part of the msg.. there is no module named after "from" ?!
Also if I disable the attr in the parent and remove the '+' in the ansestor it works.

to inherit from in VS::Payload::Postal
[download]

Any idea how can I resolve or even start to debug this problem ?
Here is the error I get in version 2.1200 :

Could not find an attribute by the name of 'obj_templates' to inherit 
+from in VS::Payload::Postal at /home/raptor/perl5/perlbrew/perls/perl
+-5.18.2/lib/site_perl/5.18.2/x86_64-linux/Moose/Exception.pm line 38
    Moose::Exception::_build_trace('Moose::Exception::NoAttributeFound
+InSuperClass=HASH(0x245be10)') called at reader Moose::Exception::tra
+ce (defined at /home/raptor/perl5/perlbrew/perls/perl-5.18.2/lib/site
+_perl/5.18.2/x86_64-linux/Moose/Exception.pm line 12) line 7
    Moose::Exception::trace('Moose::Exception::NoAttributeFoundInSuper
+Class=HASH(0x245be10)') called at /home/raptor/perl5/perlbrew/perls/p
+erl-5.18.2/lib/site_perl/5.18.2/x86_64-linux/Moose/Exception.pm line 
+50
    Moose::Exception::BUILD('Moose::Exception::NoAttributeFoundInSuper
+Class=HASH(0x245be10)', 'HASH(0x240dc40)') called at /home/raptor/per
+l5/perlbrew/perls/perl-5.18.2/lib/site_perl/5.18.2/x86_64-linux/Class
+/MOP/Method.pm line 131
    Class::MOP::Method::execute('Moose::Meta::Method=HASH(0x24d0808)',
+ 'Moose::Exception::NoAttributeFoundInSuperClass=HASH(0x245be10)', 'H
+ASH(0x240dc40)') called at /home/raptor/perl5/perlbrew/perls/perl-5.1
+8.2/lib/site_perl/5.18.2/x86_64-linux/Moose/Object.pm line 59
    Moose::Object::BUILDALL('Moose::Exception::NoAttributeFoundInSuper
+Class=HASH(0x245be10)', 'HASH(0x240dc40)') called at /home/raptor/per
+l5/perlbrew/perls/perl-5.18.2/lib/site_perl/5.18.2/x86_64-linux/Moose
+/Meta/Class.pm line 285
    Moose::Meta::Class::new_object('Moose::Meta::Class=HASH(0x245c050)
+', 'HASH(0x240dc40)') called at /home/raptor/perl5/perlbrew/perls/per
+l-5.18.2/lib/site_perl/5.18.2/x86_64-linux/Moose/Object.pm line 30
    Moose::Object::new('Moose::Exception::NoAttributeFoundInSuperClass
+', 'class', 'Moose::Meta::Class=HASH(0x2222158)', 'attribute_name', '
+obj_templates', 'params', 'HASH(0x1078580)') called at /home/raptor/p
+erl5/perlbrew/perls/perl-5.18.2/lib/site_perl/5.18.2/x86_64-linux/Moo
+se/Util.pm line 54
    Moose::Util::throw_exception('NoAttributeFoundInSuperClass', 'clas
+s', 'Moose::Meta::Class=HASH(0x2222158)', 'attribute_name', 'obj_temp
+lates', 'params', 'HASH(0x1078580)') called at /home/raptor/perl5/per
+lbrew/perls/perl-5.18.2/lib/site_perl/5.18.2/x86_64-linux/Moose/Meta/
+Class.pm line 726
    Moose::Meta::Class::_process_inherited_attribute('Moose::Meta::Cla
+ss=HASH(0x2222158)', 'obj_templates', 'definition_context', 'HASH(0x2
+417890)', 'default', 'CODE(0x23dbd60)') called at /home/raptor/perl5/
+perlbrew/perls/perl-5.18.2/lib/site_perl/5.18.2/x86_64-linux/Moose/Me
+ta/Class.pm line 709
    Moose::Meta::Class::_process_attribute('Moose::Meta::Class=HASH(0x
+2222158)', '+obj_templates', 'definition_context', 'HASH(0x2417890)',
+ 'default', 'CODE(0x23dbd60)') called at /home/raptor/perl5/perlbrew/
+perls/perl-5.18.2/lib/site_perl/5.18.2/x86_64-linux/Moose/Meta/Class.
+pm line 576
    Moose::Meta::Class::add_attribute('Moose::Meta::Class=HASH(0x22221
+58)', '+obj_templates', 'definition_context', 'HASH(0x2417890)', 'def
+ault', 'CODE(0x23dbd60)') called at /home/raptor/perl5/perlbrew/perls
+/perl-5.18.2/lib/site_perl/5.18.2/x86_64-linux/Moose.pm line 80
    Moose::has('Moose::Meta::Class=HASH(0x2222158)', '+obj_templates',
+ 'default', 'CODE(0x23dbd60)') called at /home/raptor/perl5/perlbrew/
+perls/perl-5.18.2/lib/site_perl/5.18.2/x86_64-linux/Moose/Exporter.pm
+ line 408
    Moose::has('+obj_templates', 'default', 'CODE(0x23dbd60)') called 
+at ../base/lib/VS/Payload/Postal.pm line 15
    require VS/Payload/Postal.pm at ../lib/VS/App/SRC3.pm line 8
    VS::App::SRC3::BEGIN at ../base/lib/VS/Payload/Postal.pm line 0
    eval {...} at ../base/lib/VS/Payload/Postal.pm line 0
    require VS/App/SRC3.pm at src3.pl line 4
    main::BEGIN at ../base/lib/VS/Payload/Postal.pm line 0
    eval {...} at ../base/lib/VS/Payload/Postal.pm line 0
Compilation failed in require at ../lib/VS/App/SRC3.pm line 8.
BEGIN failed--compilation aborted at ../lib/VS/App/SRC3.pm line 8.
Compilation failed in require at src3.pl line 4.
BEGIN failed--compilation aborted at src3.pl line 4.
[download]

Comment on Moose: inherited attributes Select or Download Code

Replies are listed 'Best First'.
Re: Moose: inherited attributes by tobyink (Canon) on Jan 10, 2014 at 23:57 UTC
Moose's error messages are notoriously bad. There's often a helpful line, but it's usually buried in a hundred other unhelpful ones. You haven't shown any source code, so the best I can do is take a wild stab in the dark. One biggish change between Moose 2.08 and 2.12 is the way that Moose decides whether a class is loaded or not. In older versions of Moose it used various interesting heuristics. In newer versions it uses the simpler policy of checking `%INC`. Your VS::Payload::Postal class inherits from some base class. Is this base class in an appropriately named module file - i.e. if the base class is called Foo::Bar, then is it defined in a file called "Foo/Bar.pm", and stored in a directory listed in @INC? `use Moops; class Cow :rw { has name => (default => 'Ermintrude') }; say Cow->new->name`	[reply] [d/l]
Re^2: Moose: inherited attributes by rootcho (Pilgrim) on Jan 12, 2014 at 02:37 UTC
thanks. .No the file names match.. That is how the code looks.. `VS::Payload has 'obj_templates', is => 'rw', isa => 'HashRef'; VS::Payload::Postal has '+obj_templates', is => 'rw', default => sub{{ .... }};` [download] It works if I change it to this : `VS::Payload #has 'obj_templates', is => 'rw', isa => 'HashRef'; VS::Payload::Postal has 'obj_templates', is => 'rw', default => sub{{ .... }};` [download] i.e. it behaves as if I have not declared anything in the parent class.	[reply] [d/l] [select]
Re: Moose: inherited attributes by educated_foo (Vicar) on Jan 11, 2014 at 02:14 UTC
This reminds me of decoding C++ template compiler barf in the 90s, but worse, because it includes random memory addresses you can no longer see, rather than the names of internal templates in libstdc++. C++ compilers are much better these days, so at least there is some hope over the next decade.	[reply]


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