Name

File::DataClass::Schema - Base class for schema definitions

Synopsis

   use File::DataClass::Schema;

   $schema = File::DataClass::Schema->new
      ( path    => [ qw( path to a file ) ],
        result_source_attributes => { source_name => {}, },
        tempdir => [ qw( path to a directory ) ] );

   $schema->source( 'source_name' )
          ->attributes( [ qw( list of attr names ) ] );
   $rs = $schema->resultset( 'source_name' );
   $result = $rs->find( { name => 'id of record to find' } );
   $result->$attr_name( $some_new_value );
   $result->update;
   @result = $rs->search( { 'attr name' => 'some value' } );

Description

Base class for schema definitions. Each record in a data file requires a result source to define it's attributes. Schema subclasses define the result sources and create new result set instances. Result sets can be used to find existing records by their identity field, or to search for result objects. Attributes of result objects can be mutated and then persisted

Configuration and Environment

Registers all result sources defined by the result source attributes

Creates a new instance of the storage class which defaults to File::DataClass::Storage::JSON

Defines these attributes

cache

Instantiates and returns the Cache class attribute. Built on demand

cache_attributes

Passed to the Cache::Cache constructor

cache_class

Classname used to create the cache object. Defaults to File::DataClass::Cache. Can be the dummy class none

lock

Defaults to Class::Null. Can be set via the builder attribute. Built on demand

log

Log object. Typically an instance of Log::Handler

path

Path to the file. This is a File::DataClass::IO object that can be coerced from either a string or an array reference

perms

Permissions to set on the file if it is created. Defaults to PERMS

result_source_attributes

A hash reference of result sources. See File::DataClass::ResultSource

result_source_class

The class name used to create result sources when the source registration attribute is instantiated. Acts as a schema wide default of not overridden in the result_source_attributes

source_registrations

A hash ref or registered result sources, i.e. the keys of the result_source_attributes hash

storage

An instance of a subclass of File::DataClass::Storage

storage_attributes

Attributes passed to the storage object's constructor

storage_class

The name of the storage class to instantiate

tempdir

Temporary directory used to store the cache and lock objects disk representation

Subroutines/Methods

BUILDARGS

Constructs the attribute hash passed to the constructor method

dump

   $schema->dump( { path => $to_file, data => $data_hash } );

Dumps the data structure to a file. Path defaults to the one specified in the schema definition. Returns the data that was written to the file if successful. Can be called a class or an object method

load

   $data_hash = $schema->load( @paths );

Loads and returns the merged data structure from the named files. Paths defaults to the one specified in the schema definition. Data will be read from cache if available and not stale. Can be called a class or an object method

resultset

   $rs = $schema->resultset( $source_name );

Returns a resultset object which by default is an instance of File::DataClass::Resultset

source

   $source = $schema->source( $source_name );

Returns a result source object which by default is an instance of File::DataClass::ResultSource

sources

   @sources = $schema->sources;

Returns a list of all registered result source names

translate

   $schema->translate( $args );

Reads a file in one format and writes it back out in another format

Diagnostics

None

Dependencies

namespace::autoclean

Class::Null

File::DataClass

File::DataClass::Cache

File::DataClass::Constants

File::DataClass::Functions

File::DataClass::ResultSource

File::DataClass::Storage

File::DataClass::Types

Moo

Unexpected

Incompatibilities

There are no known incompatibilities in this module

Bugs and Limitations

There are no known bugs in this module. Please report problems to the address below. Patches are welcome

Acknowledgements

Larry Wall - For the Perl programming language

Author

Peter Flanigan, <pjfl@cpan.org>

License and Copyright

Copyright (c) 2017 Peter Flanigan. All rights reserved

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic

This program is distributed in the hope that it will be useful, but WITHOUT WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE

cpanm File::DataClass

perl -MCPAN -e shell
install File::DataClass