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package SL::DB::Helper::CustomVariables;
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use strict;
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use Carp;
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use Data::Dumper;
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use List::Util qw(first);
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use constant META_CVARS => 'cvars_config';
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sub import {
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my ($class, %params) = @_;
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my $caller_package = caller;
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# TODO: if module is empty, module overloading needs to take effect
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# certain stuff may have more than one overload, odr even more than one type
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defined $caller_package or croak 'need to be included from a caller reference';
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$params{module} ||= _calc_modules_from_overloads(%params) if $params{overloads};
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$params{sub_module} ||= '';
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$params{id} ||= _get_primary_key_column($caller_package);
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$params{module} || $params{sub_module} or croak 'need param module or sub_module';
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return unless save_meta_info($caller_package, %params);
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make_cvar_accessor($caller_package, %params);
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make_cvar_alias($caller_package, %params) if $params{cvars_alias};
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make_cvar_by_configs($caller_package, %params);
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make_cvar_by_name($caller_package, %params);
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make_cvar_as_hashref($caller_package, %params);
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make_cvar_value_parser($caller_package, %params);
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}
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sub save_meta_info {
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my ($caller_package, %params) = @_;
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my $meta = $caller_package->meta;
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return 0 if $meta->{META_CVARS()};
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$meta->{META_CVARS()} = \%params;
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return 1;
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}
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sub make_cvar_accessor {
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my ($caller_package, %params) = @_;
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my $modules = ('ARRAY' eq ref $params{module}) ?
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join ',', @{ $params{module} } :
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$params{module};
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my @module_filter = $modules ?
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("config_id" => [ \"(SELECT custom_variable_configs.id FROM custom_variable_configs WHERE custom_variable_configs.module IN ( '$modules' ))" ]) : # " make emacs happy
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();
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$caller_package->meta->add_relationships(
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custom_variables => {
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type => 'one to many',
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class => 'SL::DB::CustomVariable',
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column_map => { $params{id} => 'trans_id' },
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query_args => [ sub_module => $params{sub_module}, @module_filter ],
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}
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);
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}
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sub make_cvar_alias {
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my ($caller_package) = @_;
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no strict 'refs';
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*{ $caller_package . '::cvars' } = sub {
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goto &{ $caller_package . '::custom_variables' };
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}
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}
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# this is used for templates where you need to list every applicable config
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# auto vivifies non existent cvar objects as necessary.
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sub make_cvar_by_configs {
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my ($caller_package, %params) = @_;
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no strict 'refs';
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*{ $caller_package . '::cvars_by_config' } = sub {
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my ($self) = @_;
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@_ > 1 and croak "not an accessor";
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my $configs = _all_configs(%params);
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my $cvars = $self->custom_variables;
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my %cvars_by_config = map { $_->config_id => $_ } @$cvars;
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my @return = map(
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{
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if ( $cvars_by_config{$_->id} ) {
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$cvars_by_config{$_->id};
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}
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else {
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my $cvar = _new_cvar($self, %params, config => $_);
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$self->add_custom_variables($cvar);
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$cvar;
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}
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}
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@$configs
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);
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return \@return;
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}
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}
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# this is used for print templates where you need to refer to a variable by name
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# TODO typically these were referred as prefix_'cvar'_name
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sub make_cvar_by_name {
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my ($caller_package, %params) = @_;
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no strict 'refs';
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*{ $caller_package . '::cvar_by_name' } = sub {
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my ($self, $name) = @_;
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my $configs = _all_configs(%params);
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my $cvars = $self->custom_variables;
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my $config = first { $_->name eq $name } @$configs;
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croak "unknown cvar name $name" unless $config;
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my $cvar = first { $_->config_id eq $config->id } @$cvars;
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if (!$cvar) {
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$cvar = _new_cvar($self, %params, config => $config);
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$self->add_custom_variables($cvar);
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}
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return $cvar;
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}
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}
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sub make_cvar_as_hashref {
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my ($caller_package, %params) = @_;
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no strict 'refs';
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*{ $caller_package . '::cvar_as_hashref' } = sub {
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my ($self) = @_;
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@_ > 1 and croak "not an accessor";
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my $cvars_by_config = $self->cvars_by_config;
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my %return = map {
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$_->config->name => { value => $_->value_as_text, is_valid => $_->is_valid }
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} @$cvars_by_config;
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return \%return;
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}
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}
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sub make_cvar_value_parser {
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my ($caller_package) = @_;
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no strict 'refs';
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*{ $caller_package . '::parse_custom_variable_values' } = sub {
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my ($self) = @_;
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$_->parse_value for @{ $self->custom_variables || [] };
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return $self;
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};
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$caller_package->before_save('parse_custom_variable_values');
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}
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sub _all_configs {
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my (%params) = @_;
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require SL::DB::CustomVariableConfig;
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SL::DB::Manager::CustomVariableConfig->get_all_sorted($params{module} ? (query => [ module => $params{module} ]) : ());
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}
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sub _overload_by_module {
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my ($module, %params) = @_;
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keys %{ $params{overloads} }; # reset each iterator
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while (my ($fk, $def) = each %{ $params{overloads} }) {
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return ($fk, $def->{class}) if $def->{module} eq $module;
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}
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croak "unknown overload, cannot resolve module $module";
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}
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sub _new_cvar {
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my ($self, %params) = @_;
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my $inherited_value;
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# check overloading first
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if ($params{sub_module}) {
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my ($fk, $class) = _overload_by_module($params{config}->module, %params);
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my $base_cvar = $class->new(id => $self->$fk)->load->cvar_by_name($params{config}->name);
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$inherited_value = $base_cvar->value;
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}
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my $cvar = SL::DB::CustomVariable->new(
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config => $params{config},
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trans_id => $self->${ \ $params{id} },
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sub_module => $params{sub_module},
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);
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# value needs config
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$inherited_value
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? $cvar->value($inherited_value)
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: $cvar->value($params{config}->type_dependent_default_value);
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return $cvar;
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}
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sub _calc_modules_from_overloads {
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my (%params) = @_;
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my %modules;
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for my $def (values %{ $params{overloads} || {} }) {
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$modules{$def->{module}} = 1;
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}
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return [ keys %modules ];
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}
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sub _get_primary_key_column {
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my ($caller_package) = @_;
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my $meta = $caller_package->meta;
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my $column_name;
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$column_name = $meta->{primary_key}->{columns}->[0] if $meta->{primary_key} && (ref($meta->{primary_key}->{columns}) eq 'ARRAY') && (1 == scalar(@{ $meta->{primary_key}->{columns} }));
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croak "Unable to retrieve primary key column name: meta information for package $caller_package not set up correctly" unless $column_name;
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return $column_name;
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}
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1;
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__END__
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=encoding utf-8
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=head1 NAME
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SL::DB::Helper::CustomVariables - Mixin to provide custom variables relations
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=head1 SYNOPSIS
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# use in a primary class
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use SL::DB::Helper::CustomVariables (
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module => 'IC',
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cvars_alias => 1,
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);
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# use overloading in a secondary class
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use SL::DB::Helper::CustomVariables (
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sub_module => 'orderitems',
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cvars_alias => 1,
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overloads => {
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parts_id => {
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class => 'SL::DB::Part',
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module => 'IC',
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}
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}
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);
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=head1 DESCRIPTION
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This module provides methods to deal with named custom variables. Two concepts are understood.
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=head2 Primary CVar Classes
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Primary classes are those that feature cvars for themselves. Currently those
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are Part, Contact, Customer and Vendor. cvars for these will get saved directly
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for the object.
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=head2 Secondary CVar Classes
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Secondary classes inherit their cvars from member relationships. This is built
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so that orders can save a copy of the cvars of their parts, customers and the
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like to be immutable later on.
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Secondary classes may currently not have cvars of their own.
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=head1 INSTALLED METHODS
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=over 4
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=item C<custom_variables [ CUSTOM_VARIABLES ]>
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This is a Rose::DB::Object::Relationship accessor, generated for cvars. Use it
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like any other OneToMany relationship.
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Note that unlike L</cvars_by_config> this accessor only returns
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variables that have already been created for this object. No variables
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will be autovivified for configs for which no variable has been
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created yet.
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=item C<cvars [ CUSTOM_VARIABLES ]>
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Alias to C<custom_variables>. Will only be installed if C<cvars_alias> was
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passed to import.
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=item C<cvars_by_config>
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Thi will return a list of CVars with the following changes over the standard accessor:
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=over 4
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=item *
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The list will be returned in the sorted order of the configs.
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=item *
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For every config exactly one CVar will be returned.
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=item *
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If no cvar was found for a config, a new one will be vivified, set to the
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correct config, module etc, and registered into the object.
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=item *
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Vivified cvars for secondary classes will first try to find their base object
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and use that value. If no such value or cvar is found the default value from
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configs applies.
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=back
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This is useful if you need to list every possible CVar, like in CRUD masks.
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=item C<cvar_by_name NAME [ VALUE ]>
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Returns the CVar object for this object which matches the given internal name.
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Useful for print templates. If the requested cvar is not present, it will be
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vivified with the same rules as in C<cvars_by_config>.
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=item C<parse_custom_variable_values>
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When you want to edit custom variables in a form then you have
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unparsed values from the user. These should be written to the
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variable's C<unparsed_value> field.
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This function then processes all variables and parses their
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C<unparsed_value> field into the proper field. It returns C<$self> for
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easy chaining.
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This is automatically called in a C<before_save> hook so you don't
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have to do it manually if you save directly after assigning the
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values.
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In an HTML form you could e.g. use something like the following:
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[%- FOREACH var = SELF.project.cvars_by_config.as_list %]
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[% HTML.escape(var.config.description) %]:
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[% L.hidden_tag('project.custom_variables[+].config_id', var.config.id) %]
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[% PROCESS 'common/render_cvar_input.html' var_name='project.custom_variables[].unparsed_value' %]
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[%- END %]
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Later in the controller when you want to save this project you don't
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have to do anything special:
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my $project = SL::DB::Project->new;
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my $params = $::form->{project} || {};
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$project->assign_attributes(%{ $params });
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$project->parse_custom_variable_values->save;
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However, if you need access to a variable's value before saving in
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some way then you have to call this function manually. For example:
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my $project = SL::DB::Project->new;
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my $params = $::form->{project} || {};
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$project->assign_attributes(%{ $params });
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$project->parse_custom_variable_values;
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print STDERR "CVar[0] value: " . $project->custom_variables->[0]->value . "\n";
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=back
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=head1 AUTHOR
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Sven Schöling E<lt>s.schoeling@linet-services.deE<gt>,
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Moritz Bunkus E<lt>m.bunkus@linet-services.deE<gt>
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=cut
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