Config::Model::Itself - Model (or schema) editor for Config::Model


version 2.022


 # Itself constructor returns an object to read or write the data
 # structure containing the model to be edited
 my $meta_model = Config::Model::Itself -> new( ) ;

 # now load the model to be edited
 $meta_model -> read_all( ) ;

 # For Curses UI prepare a call-back to write model
 my $wr_back = sub { $meta_model->write_all(); }

 # create Curses user interface
 my $dialog = Config::Model::CursesUI-> new (
      store => $wr_back,
 ) ;

 # start Curses dialog to edit the mode
 $dialog->start( $meta_model->config_root )  ;

 # that's it. When user quits curses interface, Curses will call
 # $wr_back sub ref to write the modified model.


Config::Itself module and its model files provide a model of Config:Model (hence the Itself name).

Let's step back a little to explain. Any configuration data is, in essence, structured data. A configuration model is a way to describe the structure and relation of all items of a configuration data set.

This configuration model is also expressed as structured data. This structure data follows a set of rules which are described for humans in Config::Model.

The structure and rules documented in Config::Model are also expressed in a model in the files provided with Config::Model::Itself.

Hence the possibity to verify, modify configuration data provided by Config::Model can also be applied on configuration models. Using the same user interface.

From a Perl point of view, Config::Model::Itself provides a class dedicated to read and write a set of model files.


new ( [ cm_lib_dir => ... ] )

Creates a new read/write handler. If no model_object is passed, the required objects are created. cm_lib_dir specifies where are the model files (defaults to ./lib/Config/Model.

cm_lib_dir is either a Path::Tiny object or a string.

By default, this constructor will create all necessary Config::Model* objects. If needed, you can pass already created object with options config_model (Config::Model object), meta_instance (Config::Model::Instance object) or meta_root (Config::Model::Node object).


read_all ( [ root_model => ... ], [ force_load => 1 ] )

Load all the model files contained in model_dir and all its subdirectories. root_model is used to filter the classes read.

Use force_load if you are trying to load a model containing errors.

read_all returns a hash ref containing ( class_name => file_name , ...)


Will write back configuration model in the specified directory. The structure of the read directory is respected.

write_model_plugin( plugin_dir => foo, plugin_name => bar )

Write plugin models in the passed plugin_dir directory. The written file is path is made of plugin name and class names. E.g. a plugin named bar for class Foo::Bar is written in bar/Foo/ file. This file is to be used by augment_config_class '...', class_data )">

read_model_plugin( plugin_dir => foo, plugin_name => )

This method searched recursively $plugin_dir/$plugin_name and load all *.pl files found there.


Returns a string listing all the class and elements. Useful for debugging your configuration model.


Returns a graphviz dot file that represents the structure of the configuration model:

  • include relations are represented by solid lines

  • Class usage (i.e. config_class_name parameter) is represented by dashed lines. The name of the element is attached to the dashed line.


Test menu entries are created from the content of application model parameter. Unfortunately, there's no way to build the menu dynamically. So user cme must be restarted to change the menu if the application list is changed.


Here's the list of people who helped improve this project:

Gregor Herrmann

Thanks for the patches !


Config::Model, Config::Model::Node, Path::Tiny


Dominique Dumont


This software is Copyright (c) 2007-2019 by Dominique Dumont.

This is free software, licensed under:

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



The following websites have more information about this module, and may be of help to you. As always, in addition to those websites please use your favorite search engine to discover more resources.

Bugs / Feature Requests

Please report any bugs or feature requests by email to ddumont at, or through the web interface at You will be automatically notified of any progress on the request by the system.

Source Code

The code is open to the world, and available for you to hack on. Please feel free to browse it and play with it, or whatever. If you want to contribute patches, please send me a diff or prod me to pull from your repository :)

  git clone git://