Config::Model::Dumper - Serialize data of config tree


version 2.153


 use Config::Model ;

 # define configuration tree object
 my $model = Config::Model->new ;
 $model ->create_config_class (
    name => "MyClass",
    element => [
        [qw/foo bar/] => {
            type => 'leaf',
            value_type => 'string'
        baz => {
            type => 'hash',
            index_type => 'string' ,
            cargo => {
                type => 'leaf',
                value_type => 'string',

 ) ;

 my $inst = $model->instance(root_class_name => 'MyClass' );

 my $root = $inst->config_root ;

 # put some data in config tree the hard way
 $root->fetch_element('foo')->store('yada') ;
 $root->fetch_element('bar')->store('bla bla') ;
 $root->fetch_element('baz')->fetch_with_id('en')->store('hello') ;

 # put more data the easy way
 my $steps = 'baz:fr=bonjour baz:hr="dobar dan"';
 $root->load( steps => $steps ) ;

 # dump only customized data
 print $root->dump_tree;


This module is used directly by Config::Model::Node to serialize configuration data in a compact (but readable) string.

The serialization can be done in standard mode where only customized values are dumped in the string. I.e. only data modified by the user are dumped.

All other mode supported by "fetch" in Config::Model::Value can be used, for instance, to get default values.

The serialized string can be used by Config::Model::Loader to store the data back into a configuration tree.

Note that undefined values are skipped for list element. I.e. if a list element contains ('a',undef,'b'), the dump then contains 'a','b'.



No parameter. The constructor should be used only by Config::Model::Node.



Return a string that contains a dump of the object tree with all the values. This string follows the convention defined by Config::Model::Loader.

The serialized string can be used by Config::Model::Loader to store the data back into a configuration tree.

Parameters are:


full dumps all configuration data including default values.

All mode values from "fetch" in Config::Model::Value can be used.

By default, the dump contains only data modified by the user (i.e. custom data that differ from default or preset values).


Reference to the Config::Model::Node object that is dumped. All nodes and leaves attached to this node are also dumped.

skip_auto_write ( <backend_name> )

Skip node that have a write capability matching backend_name in their model. See Config::Model::BackendMgr.

This option must be used when using Dumper to write back configuration data. When a configuration model contains several backends (one at the tree root and others in tree nodes), setting this option ensure that the "root" configuration file does not contain data duplicated in configuration file of others tree nodes.


Scan and create data for nodes elements even if no actual data was stored in them. This may be useful to trap missing mandatory values. (default: 0)


Check value before dumping. Valid check are 'yes', 'no' and 'skip'.


Dominique Dumont, (ddumont at cpan dot org)




Dominique Dumont


This software is Copyright (c) 2005-2022 by Dominique Dumont.

This is free software, licensed under:

  The GNU Lesser General Public License, Version 2.1, February 1999