This file is indexed.

/usr/share/perl5/DBIx/Class/Schema.pm is in libdbix-class-perl 0.082821-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
package DBIx::Class::Schema;

use strict;
use warnings;

use base 'DBIx::Class';

use DBIx::Class::Carp;
use Try::Tiny;
use Scalar::Util qw/weaken blessed/;
use DBIx::Class::_Util qw(refcount quote_sub);
use Devel::GlobalDestruction;
use namespace::clean;

__PACKAGE__->mk_classdata('class_mappings' => {});
__PACKAGE__->mk_classdata('source_registrations' => {});
__PACKAGE__->mk_classdata('storage_type' => '::DBI');
__PACKAGE__->mk_classdata('storage');
__PACKAGE__->mk_classdata('exception_action');
__PACKAGE__->mk_classdata('stacktrace' => $ENV{DBIC_TRACE} || 0);
__PACKAGE__->mk_classdata('default_resultset_attributes' => {});

=head1 NAME

DBIx::Class::Schema - composable schemas

=head1 SYNOPSIS

  package Library::Schema;
  use base qw/DBIx::Class::Schema/;

  # load all Result classes in Library/Schema/Result/
  __PACKAGE__->load_namespaces();

  package Library::Schema::Result::CD;
  use base qw/DBIx::Class::Core/;

  __PACKAGE__->load_components(qw/InflateColumn::DateTime/); # for example
  __PACKAGE__->table('cd');

  # Elsewhere in your code:
  my $schema1 = Library::Schema->connect(
    $dsn,
    $user,
    $password,
    { AutoCommit => 1 },
  );

  my $schema2 = Library::Schema->connect($coderef_returning_dbh);

  # fetch objects using Library::Schema::Result::DVD
  my $resultset = $schema1->resultset('DVD')->search( ... );
  my @dvd_objects = $schema2->resultset('DVD')->search( ... );

=head1 DESCRIPTION

Creates database classes based on a schema. This is the recommended way to
use L<DBIx::Class> and allows you to use more than one concurrent connection
with your classes.

NB: If you're used to L<Class::DBI> it's worth reading the L</SYNOPSIS>
carefully, as DBIx::Class does things a little differently. Note in
particular which module inherits off which.

=head1 SETUP METHODS

=head2 load_namespaces

=over 4

=item Arguments: %options?

=back

  package MyApp::Schema;
  __PACKAGE__->load_namespaces();

  __PACKAGE__->load_namespaces(
     result_namespace => 'Res',
     resultset_namespace => 'RSet',
     default_resultset_class => '+MyApp::Othernamespace::RSet',
  );

With no arguments, this method uses L<Module::Find> to load all of the
Result and ResultSet classes under the namespace of the schema from
which it is called.  For example, C<My::Schema> will by default find
and load Result classes named C<My::Schema::Result::*> and ResultSet
classes named C<My::Schema::ResultSet::*>.

ResultSet classes are associated with Result class of the same name.
For example, C<My::Schema::Result::CD> will get the ResultSet class
C<My::Schema::ResultSet::CD> if it is present.

Both Result and ResultSet namespaces are configurable via the
C<result_namespace> and C<resultset_namespace> options.

Another option, C<default_resultset_class> specifies a custom default
ResultSet class for Result classes with no corresponding ResultSet.

All of the namespace and classname options are by default relative to
the schema classname.  To specify a fully-qualified name, prefix it
with a literal C<+>.  For example, C<+Other::NameSpace::Result>.

=head3 Warnings

You will be warned if ResultSet classes are discovered for which there
are no matching Result classes like this:

  load_namespaces found ResultSet class $classname with no corresponding Result class

If a ResultSource instance is found to already have a ResultSet class set
using L<resultset_class|DBIx::Class::ResultSource/resultset_class> to some
other class, you will be warned like this:

  We found ResultSet class '$rs_class' for '$result_class', but it seems
  that you had already set '$result_class' to use '$rs_set' instead

=head3 Examples

  # load My::Schema::Result::CD, My::Schema::Result::Artist,
  #    My::Schema::ResultSet::CD, etc...
  My::Schema->load_namespaces;

  # Override everything to use ugly names.
  # In this example, if there is a My::Schema::Res::Foo, but no matching
  #   My::Schema::RSets::Foo, then Foo will have its
  #   resultset_class set to My::Schema::RSetBase
  My::Schema->load_namespaces(
    result_namespace => 'Res',
    resultset_namespace => 'RSets',
    default_resultset_class => 'RSetBase',
  );

  # Put things in other namespaces
  My::Schema->load_namespaces(
    result_namespace => '+Some::Place::Results',
    resultset_namespace => '+Another::Place::RSets',
  );

To search multiple namespaces for either Result or ResultSet classes,
use an arrayref of namespaces for that option.  In the case that the
same result (or resultset) class exists in multiple namespaces, later
entries in the list of namespaces will override earlier ones.

  My::Schema->load_namespaces(
    # My::Schema::Results_C::Foo takes precedence over My::Schema::Results_B::Foo :
    result_namespace => [ 'Results_A', 'Results_B', 'Results_C' ],
    resultset_namespace => [ '+Some::Place::RSets', 'RSets' ],
  );

=cut

# Pre-pends our classname to the given relative classname or
#   class namespace, unless there is a '+' prefix, which will
#   be stripped.
sub _expand_relative_name {
  my ($class, $name) = @_;
  $name =~ s/^\+// or $name = "${class}::${name}";
  return $name;
}

# Finds all modules in the supplied namespace, or if omitted in the
# namespace of $class. Untaints all findings as they can be assumed
# to be safe
sub _findallmod {
  require Module::Find;
  return map
    { $_ =~ /(.+)/ }   # untaint result
    Module::Find::findallmod( $_[1] || ref $_[0] || $_[0] )
  ;
}

# returns a hash of $shortname => $fullname for every package
# found in the given namespaces ($shortname is with the $fullname's
# namespace stripped off)
sub _map_namespaces {
  my ($me, $namespaces) = @_;

  my %res;
  for my $ns (@$namespaces) {
    $res{ substr($_, length "${ns}::") } = $_
      for $me->_findallmod($ns);
  }

  \%res;
}

# returns the result_source_instance for the passed class/object,
# or dies with an informative message (used by load_namespaces)
sub _ns_get_rsrc_instance {
  my $me = shift;
  my $rs_class = ref ($_[0]) || $_[0];

  return try {
    $rs_class->result_source_instance
  } catch {
    $me->throw_exception (
      "Attempt to load_namespaces() class $rs_class failed - are you sure this is a real Result Class?: $_"
    );
  };
}

sub load_namespaces {
  my ($class, %args) = @_;

  my $result_namespace = delete $args{result_namespace} || 'Result';
  my $resultset_namespace = delete $args{resultset_namespace} || 'ResultSet';

  my $default_resultset_class = delete $args{default_resultset_class};

  $default_resultset_class = $class->_expand_relative_name($default_resultset_class)
    if $default_resultset_class;

  $class->throw_exception('load_namespaces: unknown option(s): '
    . join(q{,}, map { qq{'$_'} } keys %args))
      if scalar keys %args;

  for my $arg ($result_namespace, $resultset_namespace) {
    $arg = [ $arg ] if ( $arg and ! ref $arg );

    $class->throw_exception('load_namespaces: namespace arguments must be '
      . 'a simple string or an arrayref')
        if ref($arg) ne 'ARRAY';

    $_ = $class->_expand_relative_name($_) for (@$arg);
  }

  my $results_by_source_name = $class->_map_namespaces($result_namespace);
  my $resultsets_by_source_name = $class->_map_namespaces($resultset_namespace);

  my @to_register;
  {
    no warnings qw/redefine/;
    local *Class::C3::reinitialize = sub { } if DBIx::Class::_ENV_::OLD_MRO;
    use warnings qw/redefine/;

    # ensure classes are loaded and attached in inheritance order
    for my $result_class (values %$results_by_source_name) {
      $class->ensure_class_loaded($result_class);
    }
    my %inh_idx;
    my @source_names_by_subclass_last = sort {

      ($inh_idx{$a} ||=
        scalar @{mro::get_linear_isa( $results_by_source_name->{$a} )}
      )

          <=>

      ($inh_idx{$b} ||=
        scalar @{mro::get_linear_isa( $results_by_source_name->{$b} )}
      )

    } keys(%$results_by_source_name);

    foreach my $source_name (@source_names_by_subclass_last) {
      my $result_class = $results_by_source_name->{$source_name};

      my $preset_resultset_class = $class->_ns_get_rsrc_instance ($result_class)->resultset_class;
      my $found_resultset_class = delete $resultsets_by_source_name->{$source_name};

      if($preset_resultset_class && $preset_resultset_class ne 'DBIx::Class::ResultSet') {
        if($found_resultset_class && $found_resultset_class ne $preset_resultset_class) {
          carp "We found ResultSet class '$found_resultset_class' matching '$results_by_source_name->{$source_name}', but it seems "
             . "that you had already set the '$results_by_source_name->{$source_name}' resultet to '$preset_resultset_class' instead";
        }
      }
      # elsif - there may be *no* default_resultset_class, in which case we fallback to
      # DBIx::Class::Resultset and there is nothing to check
      elsif($found_resultset_class ||= $default_resultset_class) {
        $class->ensure_class_loaded($found_resultset_class);
        if(!$found_resultset_class->isa("DBIx::Class::ResultSet")) {
            carp "load_namespaces found ResultSet class '$found_resultset_class' that does not subclass DBIx::Class::ResultSet";
        }

        $class->_ns_get_rsrc_instance ($result_class)->resultset_class($found_resultset_class);
      }

      my $source_name = $class->_ns_get_rsrc_instance ($result_class)->source_name || $source_name;

      push(@to_register, [ $source_name, $result_class ]);
    }
  }

  foreach (sort keys %$resultsets_by_source_name) {
    carp "load_namespaces found ResultSet class '$resultsets_by_source_name->{$_}' "
        .'with no corresponding Result class';
  }

  Class::C3->reinitialize if DBIx::Class::_ENV_::OLD_MRO;

  $class->register_class(@$_) for (@to_register);

  return;
}

=head2 load_classes

=over 4

=item Arguments: @classes?, { $namespace => [ @classes ] }+

=back

L</load_classes> is an alternative method to L</load_namespaces>, both of
which serve similar purposes, each with different advantages and disadvantages.
In the general case you should use L</load_namespaces>, unless you need to
be able to specify that only specific classes are loaded at runtime.

With no arguments, this method uses L<Module::Find> to find all classes under
the schema's namespace. Otherwise, this method loads the classes you specify
(using L<use>), and registers them (using L</"register_class">).

It is possible to comment out classes with a leading C<#>, but note that perl
will think it's a mistake (trying to use a comment in a qw list), so you'll
need to add C<no warnings 'qw';> before your load_classes call.

If any classes found do not appear to be Result class files, you will
get the following warning:

   Failed to load $comp_class. Can't find source_name method. Is
   $comp_class really a full DBIC result class? Fix it, move it elsewhere,
   or make your load_classes call more specific.

Example:

  My::Schema->load_classes(); # loads My::Schema::CD, My::Schema::Artist,
                              # etc. (anything under the My::Schema namespace)

  # loads My::Schema::CD, My::Schema::Artist, Other::Namespace::Producer but
  # not Other::Namespace::LinerNotes nor My::Schema::Track
  My::Schema->load_classes(qw/ CD Artist #Track /, {
    Other::Namespace => [qw/ Producer #LinerNotes /],
  });

=cut

sub load_classes {
  my ($class, @params) = @_;

  my %comps_for;

  if (@params) {
    foreach my $param (@params) {
      if (ref $param eq 'ARRAY') {
        # filter out commented entries
        my @modules = grep { $_ !~ /^#/ } @$param;

        push (@{$comps_for{$class}}, @modules);
      }
      elsif (ref $param eq 'HASH') {
        # more than one namespace possible
        for my $comp ( keys %$param ) {
          # filter out commented entries
          my @modules = grep { $_ !~ /^#/ } @{$param->{$comp}};

          push (@{$comps_for{$comp}}, @modules);
        }
      }
      else {
        # filter out commented entries
        push (@{$comps_for{$class}}, $param) if $param !~ /^#/;
      }
    }
  } else {
    my @comp = map { substr $_, length "${class}::"  }
                 $class->_findallmod($class);
    $comps_for{$class} = \@comp;
  }

  my @to_register;
  {
    no warnings qw/redefine/;
    local *Class::C3::reinitialize = sub { } if DBIx::Class::_ENV_::OLD_MRO;
    use warnings qw/redefine/;

    foreach my $prefix (keys %comps_for) {
      foreach my $comp (@{$comps_for{$prefix}||[]}) {
        my $comp_class = "${prefix}::${comp}";
        $class->ensure_class_loaded($comp_class);

        my $snsub = $comp_class->can('source_name');
        if(! $snsub ) {
          carp "Failed to load $comp_class. Can't find source_name method. Is $comp_class really a full DBIC result class? Fix it, move it elsewhere, or make your load_classes call more specific.";
          next;
        }
        $comp = $snsub->($comp_class) || $comp;

        push(@to_register, [ $comp, $comp_class ]);
      }
    }
  }
  Class::C3->reinitialize if DBIx::Class::_ENV_::OLD_MRO;

  foreach my $to (@to_register) {
    $class->register_class(@$to);
  }
}

=head2 storage_type

=over 4

=item Arguments: $storage_type|{$storage_type, \%args}

=item Return Value: $storage_type|{$storage_type, \%args}

=item Default value: DBIx::Class::Storage::DBI

=back

Set the storage class that will be instantiated when L</connect> is called.
If the classname starts with C<::>, the prefix C<DBIx::Class::Storage> is
assumed by L</connect>.

You want to use this to set subclasses of L<DBIx::Class::Storage::DBI>
in cases where the appropriate subclass is not autodetected.

If your storage type requires instantiation arguments, those are
defined as a second argument in the form of a hashref and the entire
value needs to be wrapped into an arrayref or a hashref.  We support
both types of refs here in order to play nice with your
Config::[class] or your choice. See
L<DBIx::Class::Storage::DBI::Replicated> for an example of this.

=head2 exception_action

=over 4

=item Arguments: $code_reference

=item Return Value: $code_reference

=item Default value: None

=back

When L</throw_exception> is invoked and L</exception_action> is set to a code
reference, this reference will be called instead of
L<DBIx::Class::Exception/throw>, with the exception message passed as the only
argument.

Your custom throw code B<must> rethrow the exception, as L</throw_exception> is
an integral part of DBIC's internal execution control flow.

Example:

   package My::Schema;
   use base qw/DBIx::Class::Schema/;
   use My::ExceptionClass;
   __PACKAGE__->exception_action(sub { My::ExceptionClass->throw(@_) });
   __PACKAGE__->load_classes;

   # or:
   my $schema_obj = My::Schema->connect( .... );
   $schema_obj->exception_action(sub { My::ExceptionClass->throw(@_) });

=head2 stacktrace

=over 4

=item Arguments: boolean

=back

Whether L</throw_exception> should include stack trace information.
Defaults to false normally, but defaults to true if C<$ENV{DBIC_TRACE}>
is true.

=head2 sqlt_deploy_hook

=over

=item Arguments: $sqlt_schema

=back

An optional sub which you can declare in your own Schema class that will get
passed the L<SQL::Translator::Schema> object when you deploy the schema via
L</create_ddl_dir> or L</deploy>.

For an example of what you can do with this, see
L<DBIx::Class::Manual::Cookbook/Adding Indexes And Functions To Your SQL>.

Note that sqlt_deploy_hook is called by L</deployment_statements>, which in turn
is called before L</deploy>. Therefore the hook can be used only to manipulate
the L<SQL::Translator::Schema> object before it is turned into SQL fed to the
database. If you want to execute post-deploy statements which can not be generated
by L<SQL::Translator>, the currently suggested method is to overload L</deploy>
and use L<dbh_do|DBIx::Class::Storage::DBI/dbh_do>.

=head1 METHODS

=head2 connect

=over 4

=item Arguments: @connectinfo

=item Return Value: $new_schema

=back

Creates and returns a new Schema object. The connection info set on it
is used to create a new instance of the storage backend and set it on
the Schema object.

See L<DBIx::Class::Storage::DBI/"connect_info"> for DBI-specific
syntax on the C<@connectinfo> argument, or L<DBIx::Class::Storage> in
general.

Note that C<connect_info> expects an arrayref of arguments, but
C<connect> does not. C<connect> wraps its arguments in an arrayref
before passing them to C<connect_info>.

=head3 Overloading

C<connect> is a convenience method. It is equivalent to calling
$schema->clone->connection(@connectinfo). To write your own overloaded
version, overload L</connection> instead.

=cut

sub connect { shift->clone->connection(@_) }

=head2 resultset

=over 4

=item Arguments: L<$source_name|DBIx::Class::ResultSource/source_name>

=item Return Value: L<$resultset|DBIx::Class::ResultSet>

=back

  my $rs = $schema->resultset('DVD');

Returns the L<DBIx::Class::ResultSet> object for the registered source
name.

=cut

sub resultset {
  my ($self, $source_name) = @_;
  $self->throw_exception('resultset() expects a source name')
    unless defined $source_name;
  return $self->source($source_name)->resultset;
}

=head2 sources

=over 4

=item Return Value: L<@source_names|DBIx::Class::ResultSource/source_name>

=back

  my @source_names = $schema->sources;

Lists names of all the sources registered on this Schema object.

=cut

sub sources { keys %{shift->source_registrations} }

=head2 source

=over 4

=item Arguments: L<$source_name|DBIx::Class::ResultSource/source_name>

=item Return Value: L<$result_source|DBIx::Class::ResultSource>

=back

  my $source = $schema->source('Book');

Returns the L<DBIx::Class::ResultSource> object for the registered
source name.

=cut

sub source {
  my $self = shift;

  $self->throw_exception("source() expects a source name")
    unless @_;

  my $source_name = shift;

  my $sreg = $self->source_registrations;
  return $sreg->{$source_name} if exists $sreg->{$source_name};

  # if we got here, they probably passed a full class name
  my $mapped = $self->class_mappings->{$source_name};
  $self->throw_exception("Can't find source for ${source_name}")
    unless $mapped && exists $sreg->{$mapped};
  return $sreg->{$mapped};
}

=head2 class

=over 4

=item Arguments: L<$source_name|DBIx::Class::ResultSource/source_name>

=item Return Value: $classname

=back

  my $class = $schema->class('CD');

Retrieves the Result class name for the given source name.

=cut

sub class {
  return shift->source(shift)->result_class;
}

=head2 txn_do

=over 4

=item Arguments: C<$coderef>, @coderef_args?

=item Return Value: The return value of $coderef

=back

Executes C<$coderef> with (optional) arguments C<@coderef_args> atomically,
returning its result (if any). Equivalent to calling $schema->storage->txn_do.
See L<DBIx::Class::Storage/"txn_do"> for more information.

This interface is preferred over using the individual methods L</txn_begin>,
L</txn_commit>, and L</txn_rollback> below.

WARNING: If you are connected with C<< AutoCommit => 0 >> the transaction is
considered nested, and you will still need to call L</txn_commit> to write your
changes when appropriate. You will also want to connect with C<< auto_savepoint =>
1 >> to get partial rollback to work, if the storage driver for your database
supports it.

Connecting with C<< AutoCommit => 1 >> is recommended.

=cut

sub txn_do {
  my $self = shift;

  $self->storage or $self->throw_exception
    ('txn_do called on $schema without storage');

  $self->storage->txn_do(@_);
}

=head2 txn_scope_guard

Runs C<txn_scope_guard> on the schema's storage. See
L<DBIx::Class::Storage/txn_scope_guard>.

=cut

sub txn_scope_guard {
  my $self = shift;

  $self->storage or $self->throw_exception
    ('txn_scope_guard called on $schema without storage');

  $self->storage->txn_scope_guard(@_);
}

=head2 txn_begin

Begins a transaction (does nothing if AutoCommit is off). Equivalent to
calling $schema->storage->txn_begin. See
L<DBIx::Class::Storage/"txn_begin"> for more information.

=cut

sub txn_begin {
  my $self = shift;

  $self->storage or $self->throw_exception
    ('txn_begin called on $schema without storage');

  $self->storage->txn_begin;
}

=head2 txn_commit

Commits the current transaction. Equivalent to calling
$schema->storage->txn_commit. See L<DBIx::Class::Storage/"txn_commit">
for more information.

=cut

sub txn_commit {
  my $self = shift;

  $self->storage or $self->throw_exception
    ('txn_commit called on $schema without storage');

  $self->storage->txn_commit;
}

=head2 txn_rollback

Rolls back the current transaction. Equivalent to calling
$schema->storage->txn_rollback. See
L<DBIx::Class::Storage/"txn_rollback"> for more information.

=cut

sub txn_rollback {
  my $self = shift;

  $self->storage or $self->throw_exception
    ('txn_rollback called on $schema without storage');

  $self->storage->txn_rollback;
}

=head2 storage

  my $storage = $schema->storage;

Returns the L<DBIx::Class::Storage> object for this Schema. Grab this
if you want to turn on SQL statement debugging at runtime, or set the
quote character. For the default storage, the documentation can be
found in L<DBIx::Class::Storage::DBI>.

=head2 populate

=over 4

=item Arguments: L<$source_name|DBIx::Class::ResultSource/source_name>, [ \@column_list, \@row_values+ ] | [ \%col_data+ ]

=item Return Value: L<\@result_objects|DBIx::Class::Manual::ResultClass> (scalar context) | L<@result_objects|DBIx::Class::Manual::ResultClass> (list context)

=back

A convenience shortcut to L<DBIx::Class::ResultSet/populate>. Equivalent to:

 $schema->resultset($source_name)->populate([...]);

=over 4

=item NOTE

The context of this method call has an important effect on what is
submitted to storage. In void context data is fed directly to fastpath
insertion routines provided by the underlying storage (most often
L<DBI/execute_for_fetch>), bypassing the L<new|DBIx::Class::Row/new> and
L<insert|DBIx::Class::Row/insert> calls on the
L<Result|DBIx::Class::Manual::ResultClass> class, including any
augmentation of these methods provided by components. For example if you
are using something like L<DBIx::Class::UUIDColumns> to create primary
keys for you, you will find that your PKs are empty.  In this case you
will have to explicitly force scalar or list context in order to create
those values.

=back

=cut

sub populate {
  my ($self, $name, $data) = @_;
  my $rs = $self->resultset($name)
    or $self->throw_exception("'$name' is not a resultset");

  return $rs->populate($data);
}

=head2 connection

=over 4

=item Arguments: @args

=item Return Value: $new_schema

=back

Similar to L</connect> except sets the storage object and connection
data in-place on the Schema class. You should probably be calling
L</connect> to get a proper Schema object instead.

=head3 Overloading

Overload C<connection> to change the behaviour of C<connect>.

=cut

sub connection {
  my ($self, @info) = @_;
  return $self if !@info && $self->storage;

  my ($storage_class, $args) = ref $self->storage_type
    ? $self->_normalize_storage_type($self->storage_type)
    : $self->storage_type
  ;

  $storage_class =~ s/^::/DBIx::Class::Storage::/;

  try {
    $self->ensure_class_loaded ($storage_class);
  }
  catch {
    $self->throw_exception(
      "Unable to load storage class ${storage_class}: $_"
    );
  };

  my $storage = $storage_class->new( $self => $args||{} );
  $storage->connect_info(\@info);
  $self->storage($storage);
  return $self;
}

sub _normalize_storage_type {
  my ($self, $storage_type) = @_;
  if(ref $storage_type eq 'ARRAY') {
    return @$storage_type;
  } elsif(ref $storage_type eq 'HASH') {
    return %$storage_type;
  } else {
    $self->throw_exception('Unsupported REFTYPE given: '. ref $storage_type);
  }
}

=head2 compose_namespace

=over 4

=item Arguments: $target_namespace, $additional_base_class?

=item Return Value: $new_schema

=back

For each L<DBIx::Class::ResultSource> in the schema, this method creates a
class in the target namespace (e.g. $target_namespace::CD,
$target_namespace::Artist) that inherits from the corresponding classes
attached to the current schema.

It also attaches a corresponding L<DBIx::Class::ResultSource> object to the
new $schema object. If C<$additional_base_class> is given, the new composed
classes will inherit from first the corresponding class from the current
schema then the base class.

For example, for a schema with My::Schema::CD and My::Schema::Artist classes,

  $schema->compose_namespace('My::DB', 'Base::Class');
  print join (', ', @My::DB::CD::ISA) . "\n";
  print join (', ', @My::DB::Artist::ISA) ."\n";

will produce the output

  My::Schema::CD, Base::Class
  My::Schema::Artist, Base::Class

=cut

# this might be oversimplified
# sub compose_namespace {
#   my ($self, $target, $base) = @_;

#   my $schema = $self->clone;
#   foreach my $source_name ($schema->sources) {
#     my $source = $schema->source($source_name);
#     my $target_class = "${target}::${source_name}";
#     $self->inject_base(
#       $target_class => $source->result_class, ($base ? $base : ())
#     );
#     $source->result_class($target_class);
#     $target_class->result_source_instance($source)
#       if $target_class->can('result_source_instance');
#     $schema->register_source($source_name, $source);
#   }
#   return $schema;
# }

sub compose_namespace {
  my ($self, $target, $base) = @_;

  my $schema = $self->clone;

  $schema->source_registrations({});

  # the original class-mappings must remain - otherwise
  # reverse_relationship_info will not work
  #$schema->class_mappings({});

  {
    no warnings qw/redefine/;
    local *Class::C3::reinitialize = sub { } if DBIx::Class::_ENV_::OLD_MRO;
    use warnings qw/redefine/;

    foreach my $source_name ($self->sources) {
      my $orig_source = $self->source($source_name);

      my $target_class = "${target}::${source_name}";
      $self->inject_base($target_class, $orig_source->result_class, ($base || ()) );

      # register_source examines result_class, and then returns us a clone
      my $new_source = $schema->register_source($source_name, bless
        { %$orig_source, result_class => $target_class },
        ref $orig_source,
      );

      if ($target_class->can('result_source_instance')) {
        # give the class a schema-less source copy
        $target_class->result_source_instance( bless
          { %$new_source, schema => ref $new_source->{schema} || $new_source->{schema} },
          ref $new_source,
        );
      }
    }

    quote_sub "${target}::${_}" => "shift->schema->$_(\@_)"
      for qw(class source resultset);
  }

  Class::C3->reinitialize() if DBIx::Class::_ENV_::OLD_MRO;

  return $schema;
}

sub setup_connection_class {
  my ($class, $target, @info) = @_;
  $class->inject_base($target => 'DBIx::Class::DB');
  #$target->load_components('DB');
  $target->connection(@info);
}

=head2 svp_begin

Creates a new savepoint (does nothing outside a transaction).
Equivalent to calling $schema->storage->svp_begin.  See
L<DBIx::Class::Storage/"svp_begin"> for more information.

=cut

sub svp_begin {
  my ($self, $name) = @_;

  $self->storage or $self->throw_exception
    ('svp_begin called on $schema without storage');

  $self->storage->svp_begin($name);
}

=head2 svp_release

Releases a savepoint (does nothing outside a transaction).
Equivalent to calling $schema->storage->svp_release.  See
L<DBIx::Class::Storage/"svp_release"> for more information.

=cut

sub svp_release {
  my ($self, $name) = @_;

  $self->storage or $self->throw_exception
    ('svp_release called on $schema without storage');

  $self->storage->svp_release($name);
}

=head2 svp_rollback

Rollback to a savepoint (does nothing outside a transaction).
Equivalent to calling $schema->storage->svp_rollback.  See
L<DBIx::Class::Storage/"svp_rollback"> for more information.

=cut

sub svp_rollback {
  my ($self, $name) = @_;

  $self->storage or $self->throw_exception
    ('svp_rollback called on $schema without storage');

  $self->storage->svp_rollback($name);
}

=head2 clone

=over 4

=item Arguments: %attrs?

=item Return Value: $new_schema

=back

Clones the schema and its associated result_source objects and returns the
copy. The resulting copy will have the same attributes as the source schema,
except for those attributes explicitly overridden by the provided C<%attrs>.

=cut

sub clone {
  my $self = shift;

  my $clone = {
      (ref $self ? %$self : ()),
      (@_ == 1 && ref $_[0] eq 'HASH' ? %{ $_[0] } : @_),
  };
  bless $clone, (ref $self || $self);

  $clone->$_(undef) for qw/class_mappings source_registrations storage/;

  $clone->_copy_state_from($self);

  return $clone;
}

# Needed in Schema::Loader - if you refactor, please make a compatibility shim
# -- Caelum
sub _copy_state_from {
  my ($self, $from) = @_;

  $self->class_mappings({ %{$from->class_mappings} });
  $self->source_registrations({ %{$from->source_registrations} });

  foreach my $source_name ($from->sources) {
    my $source = $from->source($source_name);
    my $new = $source->new($source);
    # we use extra here as we want to leave the class_mappings as they are
    # but overwrite the source_registrations entry with the new source
    $self->register_extra_source($source_name => $new);
  }

  if ($from->storage) {
    $self->storage($from->storage);
    $self->storage->set_schema($self);
  }
}

=head2 throw_exception

=over 4

=item Arguments: $message

=back

Throws an exception. Obeys the exemption rules of L<DBIx::Class::Carp> to report
errors from outer-user's perspective. See L</exception_action> for details on overriding
this method's behavior.  If L</stacktrace> is turned on, C<throw_exception>'s
default behavior will provide a detailed stack trace.

=cut

sub throw_exception {
  my $self = shift;

  if (my $act = $self->exception_action) {
    if ($act->(@_)) {
      DBIx::Class::Exception->throw(
          "Invocation of the exception_action handler installed on $self did *not*"
        .' result in an exception. DBIx::Class is unable to function without a reliable'
        .' exception mechanism, ensure that exception_action does not hide exceptions'
        ." (original error: $_[0])"
      );
    }

    carp_unique (
      "The exception_action handler installed on $self returned false instead"
    .' of throwing an exception. This behavior has been deprecated, adjust your'
    .' handler to always rethrow the supplied error.'
    );
  }

  DBIx::Class::Exception->throw($_[0], $self->stacktrace);
}

=head2 deploy

=over 4

=item Arguments: \%sqlt_args, $dir

=back

Attempts to deploy the schema to the current storage using L<SQL::Translator>.

See L<SQL::Translator/METHODS> for a list of values for C<\%sqlt_args>.
The most common value for this would be C<< { add_drop_table => 1 } >>
to have the SQL produced include a C<DROP TABLE> statement for each table
created. For quoting purposes supply C<quote_identifiers>.

Additionally, the DBIx::Class parser accepts a C<sources> parameter as a hash
ref or an array ref, containing a list of source to deploy. If present, then
only the sources listed will get deployed. Furthermore, you can use the
C<add_fk_index> parser parameter to prevent the parser from creating an index for each
FK.

=cut

sub deploy {
  my ($self, $sqltargs, $dir) = @_;
  $self->throw_exception("Can't deploy without storage") unless $self->storage;
  $self->storage->deploy($self, undef, $sqltargs, $dir);
}

=head2 deployment_statements

=over 4

=item Arguments: See L<DBIx::Class::Storage::DBI/deployment_statements>

=item Return Value: $listofstatements

=back

A convenient shortcut to
C<< $self->storage->deployment_statements($self, @args) >>.
Returns the statements used by L</deploy> and
L<DBIx::Class::Storage/deploy>.

=cut

sub deployment_statements {
  my $self = shift;

  $self->throw_exception("Can't generate deployment statements without a storage")
    if not $self->storage;

  $self->storage->deployment_statements($self, @_);
}

=head2 create_ddl_dir

=over 4

=item Arguments: See L<DBIx::Class::Storage::DBI/create_ddl_dir>

=back

A convenient shortcut to
C<< $self->storage->create_ddl_dir($self, @args) >>.

Creates an SQL file based on the Schema, for each of the specified
database types, in the given directory.

=cut

sub create_ddl_dir {
  my $self = shift;

  $self->throw_exception("Can't create_ddl_dir without storage") unless $self->storage;
  $self->storage->create_ddl_dir($self, @_);
}

=head2 ddl_filename

=over 4

=item Arguments: $database-type, $version, $directory, $preversion

=item Return Value: $normalised_filename

=back

  my $filename = $table->ddl_filename($type, $version, $dir, $preversion)

This method is called by C<create_ddl_dir> to compose a file name out of
the supplied directory, database type and version number. The default file
name format is: C<$dir$schema-$version-$type.sql>.

You may override this method in your schema if you wish to use a different
format.

 WARNING

 Prior to DBIx::Class version 0.08100 this method had a different signature:

    my $filename = $table->ddl_filename($type, $dir, $version, $preversion)

 In recent versions variables $dir and $version were reversed in order to
 bring the signature in line with other Schema/Storage methods. If you
 really need to maintain backward compatibility, you can do the following
 in any overriding methods:

    ($dir, $version) = ($version, $dir) if ($DBIx::Class::VERSION < 0.08100);

=cut

sub ddl_filename {
  my ($self, $type, $version, $dir, $preversion) = @_;

  require File::Spec;

  $version = "$preversion-$version" if $preversion;

  my $class = blessed($self) || $self;
  $class =~ s/::/-/g;

  return File::Spec->catfile($dir, "$class-$version-$type.sql");
}

=head2 thaw

Provided as the recommended way of thawing schema objects. You can call
C<Storable::thaw> directly if you wish, but the thawed objects will not have a
reference to any schema, so are rather useless.

=cut

sub thaw {
  my ($self, $obj) = @_;
  local $DBIx::Class::ResultSourceHandle::thaw_schema = $self;
  return Storable::thaw($obj);
}

=head2 freeze

This doesn't actually do anything beyond calling L<nfreeze|Storable/SYNOPSIS>,
it is just provided here for symmetry.

=cut

sub freeze {
  return Storable::nfreeze($_[1]);
}

=head2 dclone

=over 4

=item Arguments: $object

=item Return Value: dcloned $object

=back

Recommended way of dcloning L<DBIx::Class::Row> and L<DBIx::Class::ResultSet>
objects so their references to the schema object
(which itself is B<not> cloned) are properly maintained.

=cut

sub dclone {
  my ($self, $obj) = @_;
  local $DBIx::Class::ResultSourceHandle::thaw_schema = $self;
  return Storable::dclone($obj);
}

=head2 schema_version

Returns the current schema class' $VERSION in a normalised way.

=cut

sub schema_version {
  my ($self) = @_;
  my $class = ref($self)||$self;

  # does -not- use $schema->VERSION
  # since that varies in results depending on if version.pm is installed, and if
  # so the perl or XS versions. If you want this to change, bug the version.pm
  # author to make vpp and vxs behave the same.

  my $version;
  {
    no strict 'refs';
    $version = ${"${class}::VERSION"};
  }
  return $version;
}


=head2 register_class

=over 4

=item Arguments: $source_name, $component_class

=back

This method is called by L</load_namespaces> and L</load_classes> to install the found classes into your Schema. You should be using those instead of this one.

You will only need this method if you have your Result classes in
files which are not named after the packages (or all in the same
file). You may also need it to register classes at runtime.

Registers a class which isa DBIx::Class::ResultSourceProxy. Equivalent to
calling:

  $schema->register_source($source_name, $component_class->result_source_instance);

=cut

sub register_class {
  my ($self, $source_name, $to_register) = @_;
  $self->register_source($source_name => $to_register->result_source_instance);
}

=head2 register_source

=over 4

=item Arguments: $source_name, L<$result_source|DBIx::Class::ResultSource>

=back

This method is called by L</register_class>.

Registers the L<DBIx::Class::ResultSource> in the schema with the given
source name.

=cut

sub register_source { shift->_register_source(@_) }

=head2 unregister_source

=over 4

=item Arguments: $source_name

=back

Removes the L<DBIx::Class::ResultSource> from the schema for the given source name.

=cut

sub unregister_source { shift->_unregister_source(@_) }

=head2 register_extra_source

=over 4

=item Arguments: $source_name, L<$result_source|DBIx::Class::ResultSource>

=back

As L</register_source> but should be used if the result class already
has a source and you want to register an extra one.

=cut

sub register_extra_source { shift->_register_source(@_, { extra => 1 }) }

sub _register_source {
  my ($self, $source_name, $source, $params) = @_;

  $source = $source->new({ %$source, source_name => $source_name });

  $source->schema($self);
  weaken $source->{schema} if ref($self);

  my %reg = %{$self->source_registrations};
  $reg{$source_name} = $source;
  $self->source_registrations(\%reg);

  return $source if $params->{extra};

  my $rs_class = $source->result_class;
  if ($rs_class and my $rsrc = try { $rs_class->result_source_instance } ) {
    my %map = %{$self->class_mappings};
    if (
      exists $map{$rs_class}
        and
      $map{$rs_class} ne $source_name
        and
      $rsrc ne $_[2]  # orig_source
    ) {
      carp
        "$rs_class already had a registered source which was replaced by this call. "
      . 'Perhaps you wanted register_extra_source(), though it is more likely you did '
      . 'something wrong.'
      ;
    }

    $map{$rs_class} = $source_name;
    $self->class_mappings(\%map);
  }

  return $source;
}

my $global_phase_destroy;
sub DESTROY {
  ### NO detected_reinvoked_destructor check
  ### This code very much relies on being called multuple times

  return if $global_phase_destroy ||= in_global_destruction;

  my $self = shift;
  my $srcs = $self->source_registrations;

  for my $source_name (keys %$srcs) {
    # find first source that is not about to be GCed (someone other than $self
    # holds a reference to it) and reattach to it, weakening our own link
    #
    # during global destruction (if we have not yet bailed out) this should throw
    # which will serve as a signal to not try doing anything else
    # however beware - on older perls the exception seems randomly untrappable
    # due to some weird race condition during thread joining :(((
    if (length ref $srcs->{$source_name} and refcount($srcs->{$source_name}) > 1) {
      local $@;
      eval {
        $srcs->{$source_name}->schema($self);
        weaken $srcs->{$source_name};
        1;
      } or do {
        $global_phase_destroy = 1;
      };

      last;
    }
  }
}

sub _unregister_source {
    my ($self, $source_name) = @_;
    my %reg = %{$self->source_registrations};

    my $source = delete $reg{$source_name};
    $self->source_registrations(\%reg);
    if ($source->result_class) {
        my %map = %{$self->class_mappings};
        delete $map{$source->result_class};
        $self->class_mappings(\%map);
    }
}


=head2 compose_connection (DEPRECATED)

=over 4

=item Arguments: $target_namespace, @db_info

=item Return Value: $new_schema

=back

DEPRECATED. You probably wanted compose_namespace.

Actually, you probably just wanted to call connect.

=begin hidden

(hidden due to deprecation)

Calls L<DBIx::Class::Schema/"compose_namespace"> to the target namespace,
calls L<DBIx::Class::Schema/connection> with @db_info on the new schema,
then injects the L<DBix::Class::ResultSetProxy> component and a
resultset_instance classdata entry on all the new classes, in order to support
$target_namespaces::$class->search(...) method calls.

This is primarily useful when you have a specific need for class method access
to a connection. In normal usage it is preferred to call
L<DBIx::Class::Schema/connect> and use the resulting schema object to operate
on L<DBIx::Class::ResultSet> objects with L<DBIx::Class::Schema/resultset> for
more information.

=end hidden

=cut

sub compose_connection {
  my ($self, $target, @info) = @_;

  carp_once "compose_connection deprecated as of 0.08000"
    unless $INC{"DBIx/Class/CDBICompat.pm"};

  my $base = 'DBIx::Class::ResultSetProxy';
  try {
    eval "require ${base};"
  }
  catch {
    $self->throw_exception
      ("No arguments to load_classes and couldn't load ${base} ($_)")
  };

  if ($self eq $target) {
    # Pathological case, largely caused by the docs on early C::M::DBIC::Plain
    foreach my $source_name ($self->sources) {
      my $source = $self->source($source_name);
      my $class = $source->result_class;
      $self->inject_base($class, $base);
      $class->mk_classdata(resultset_instance => $source->resultset);
      $class->mk_classdata(class_resolver => $self);
    }
    $self->connection(@info);
    return $self;
  }

  my $schema = $self->compose_namespace($target, $base);
  quote_sub "${target}::schema", '$s', { '$s' => \$schema };

  $schema->connection(@info);
  foreach my $source_name ($schema->sources) {
    my $source = $schema->source($source_name);
    my $class = $source->result_class;
    #warn "$source_name $class $source ".$source->storage;
    $class->mk_classdata(result_source_instance => $source);
    $class->mk_classdata(resultset_instance => $source->resultset);
    $class->mk_classdata(class_resolver => $schema);
  }
  return $schema;
}

=head1 FURTHER QUESTIONS?

Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.

=head1 COPYRIGHT AND LICENSE

This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
redistribute it and/or modify it under the same terms as the
L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.

=cut

1;