Config::Model::Backend::Json(3pm)

NAME
Config::Model::Backend::Json - Read and write config as a JSON data structure

VERSION
version 2.159

SYNOPSIS
 use Config::Model ;
 use Data::Dumper ;

 # 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',
            },
        },
    ],
  rw_config  => {
    backend => 'Json' ,
    config_dir => '/tmp',
    file  => 'foo.json',
    auto_create => 1,
  }
 ) ;

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

 my $root = $inst->config_root ;

 my $steps = 'foo=yada bar="bla bla" baz:en=hello
             baz:fr=bonjour baz:hr="dobar dan"';
 $root->load( steps => $steps ) ;
 $inst->write_back ;

Now, "/tmp/foo.yml" contains:

 {
   "bar" : "bla bla",
   "foo" : "yada",
   "baz" : {
      "hr" : "dobar dan",
      "en" : "hello",
      "fr" : "bonjour"
   }
 }

DESCRIPTION
This module is used directly by Config::Model to read or write the content of a configuration tree written with Json syntax in "Config::Model" configuration tree.

Note that undefined values are skipped for list element. I.e. if a list element contains "('a',undef,'b')", the data structure only contains 'a','b'.

Note that you must install JSON module to use this backend.

CONSTRUCTOR

  new
Parameters: "( node => $node_obj, name => 'Json' )"

Inherited from Config::Model::Backend::Any. The constructor is called by Config::Model::BackendMgr.

  read
Of all parameters passed to this read call-back, only "file_path" is used. This parameter must be a Path::Tiny.

When a file is read, "read" returns 1.

  write
Of all parameters passed to this write call-back, only "file_path" is used. This parameter must be Path::Tiny object.

"write" returns 1.

AUTHOR
Dominique Dumont, (ddumont at cpan dot org)

SEE ALSO
Config::Model, Config::Model::BackendMgr, Config::Model::Backend::Any,

AUTHOR
Dominique Dumont

COPYRIGHT AND LICENSE
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