From 3cc8ad871fc62723dbb9879a004a2af49d21bfef Mon Sep 17 00:00:00 2001
From: =?utf8?q?Sven=20Sch=C3=B6ling?= <s.schoeling@linet-services.de>
Date: Mon, 13 Sep 2010 15:35:31 +0200
Subject: [PATCH] Exportierbarer Modelfinder "db" in SL::DB::Helpers::Mappings.

---
 SL/DB/Helpers/Mappings.pm | 65 +++++++++++++++++++++++++++++++++++++++
 t/helper/mapping.t        | 19 ++++++++++++
 2 files changed, 84 insertions(+)
 create mode 100644 t/helper/mapping.t

diff --git a/SL/DB/Helpers/Mappings.pm b/SL/DB/Helpers/Mappings.pm
index 15ce697b5..13a798543 100644
--- a/SL/DB/Helpers/Mappings.pm
+++ b/SL/DB/Helpers/Mappings.pm
@@ -2,6 +2,10 @@ package SL::DB::Helpers::Mappings;
 
 use strict;
 
+use Exporter qw(import);
+
+our @EXPORT_OK = qw(db);
+
 # these will not be managed as Rose::DB models, because they are not normalized
 # significant changes are needed to get them done.
 my @lxoffice_blacklist_permanent = qw(
@@ -69,6 +73,49 @@ sub get_package_names {
   return LXOFFICE => \%lxoffice_package_names;
 }
 
+sub db {
+  my $string = $_[0];
+  my $lookup = $lxoffice_package_names{$_[0]} ||
+      plurify($lxoffice_package_names{singlify($_[0])});
+
+  for my $thing ($string, $lookup) {
+
+    # best guess? its already the name. like part. camelize it first
+    my $class = "SL::DB::" . camelify($thing);
+    return $class if defined *{ $class. '::' };
+
+    # next, someone wants a manager and pluralized.
+    my $manager = "SL::DB::Manager::" . singlify(camelify($thing));
+    return $manager if defined *{ $manager . '::' };
+  }
+
+  die "Can't resolve '$string' as a database model, sorry. Did you perhaps forgot to load it?";
+}
+
+sub camelify {
+  my ($str) = @_;
+  $str =~ s/_+(.)/uc($1)/ge;
+  ucfirst $str;
+}
+
+sub snakify {
+  my ($str) = @_;
+  $str =~ s/(?<!^)\u(.)/'_' . lc($1)/ge;
+  lcfirst $str;
+}
+
+sub plurify {
+  my ($str) = @_;
+  $str . 's';
+}
+
+sub singlify {
+  my ($str) = @_;
+  local $/ = 's';
+  chomp $str;
+  $str;
+}
+
 1;
 
 __END__
@@ -87,6 +134,24 @@ This modul stores table <-> model mappings used by the
 L<scripts/rose_auto_create_model.pl> script.  If you add a new table that has
 custom mappings, add it here.
 
+=head2 db
+
+A special function provided here is E<db>. Without it you'd have to write:
+
+  my $part = SL::DB::Part->new(id => 1234);
+  my @all_parts = SL::DB::Manager::Part->get_all;
+
+with them it becomes:
+
+  my $part = db('part')->new(id => 123);
+  my @all_parts = db('parts')->get_all;
+
+You don't have to care about add that SL::DB:: incantation anymore. Also, a
+simple s at the end will get you the associated Manager class.
+
+db is written to try to make sense of what you give it, but if all fails, it
+will die with an error.
+
 =head1 BUGS
 
 nothing yet
diff --git a/t/helper/mapping.t b/t/helper/mapping.t
new file mode 100644
index 000000000..d0c015cf6
--- /dev/null
+++ b/t/helper/mapping.t
@@ -0,0 +1,19 @@
+use Test::More tests => 12;
+
+use_ok 'SL::DB::Helpers::ALL';
+use_ok 'SL::DB::Helpers::Mappings', qw(db);
+
+is db('part'), 'SL::DB::Part';
+is db('parts'), 'SL::DB::Manager::Part';
+
+is db('order'), 'SL::DB::Order';
+is db('orders'), 'SL::DB::Manager::Order';
+
+is db('gl'), 'SL::DB::GLTransaction';
+is db('gls'), 'SL::DB::Manager::GLTransaction';
+
+is db('ar'), 'SL::DB::Invoice';
+is db('ars'), 'SL::DB::Manager::Invoice';
+
+is db('Unit'), 'SL::DB::Unit';
+is db('Units'), 'SL::DB::Manager::Unit';
-- 
2.20.1