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Manual Reference Pages  -  MOOSEX::CONFIGFROMFILE (3)

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MooseX::ConfigFromFile - An abstract Moose role for setting attributes from a configfile



version 0.14


  ## A real role based on this abstract role:

  package MooseX::SomeSpecificConfigRole;
  use Moose::Role;

  with MooseX::ConfigFromFile;

  use Some::ConfigFile::Loader ();

  sub get_config_from_file {
    my ($class, $file) = @_;

    my $options_hashref = Some::ConfigFile::Loader->load($file);

    return $options_hashref;

  ## A class that uses it:
  package Foo;
  use Moose;
  with MooseX::SomeSpecificConfigRole;

  # optionally, default the configfile:
  sub _get_default_configfile { /tmp/foo.yaml }

  # ... insert your stuff here ...

  ## A script that uses the class with a configfile

  my $obj = Foo->new_with_config(configfile => /etc/foo.yaml, other_opt => foo);


This is an abstract role which provides an alternate constructor for creating objects using parameters passed in from a configuration file. The actual implementation of reading the configuration file is left to concrete sub-roles.

It declares an attribute configfile and a class method new_with_config, and requires that concrete roles derived from it implement the class method get_config_from_file.

Attributes specified directly as arguments to new_with_config supersede those in the configfile.

MooseX::Getopt knows about this abstract role, and will use it if available to load attributes from the file specified by the command line flag --configfile during its normal new_with_options.



This is a Path::Tiny object which can be coerced from a regular path string or any object that supports stringification. This is the file your attributes are loaded from. You can add a default configfile in the consuming class and it will be honored at the appropriate time; see below at _get_default_configfile.

If you have MooseX::Getopt installed, this attribute will also have the Getopt trait supplied, so you can also set the configfile from the command line.

Class Methods


This is an alternate constructor, which knows to look for the configfile option in its arguments and use that to set attributes. It is much like MooseX::Getopts’s new_with_options. Example:

  my $foo = SomeClass->new_with_config(configfile => /etc/foo.yaml);

Explicit arguments will override anything set by the configfile.


This class method is not implemented in this role, but it is required of all classes or roles that consume this role. Its two arguments are the class name and the configfile, and it is expected to return a hashref of arguments to pass to new() which are sourced from the configfile.


This class method is not implemented in this role, but can and should be defined in a consuming class or role to return the default value of the configfile (if not passed into the constructor explicitly).


Brandon L. Black <>


o Karen Etheridge <>
o Tomas Doran <>
o Chris Prather <>
o Yuval Kogman <>
o Zbigniew Lukasiak <>


This software is copyright (c) 2007 by Brandon L. Black.

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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perl v5.20.3 MOOSEX::CONFIGFROMFILE (3) 2015-08-16

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