Koha/Objects.pm

   1 package Koha::Objects;
   2
   3 # Copyright ByWater Solutions 2014
   4 #
   5 # This file is part of Koha.
   6 #
   7 # Koha is free software; you can redistribute it and/or modify it
   8 # under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # Koha is distributed in the hope that it will be useful, but
  13 # WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with Koha; if not, see <http://www.gnu.org/licenses>.
  19
  20 use Modern::Perl;
  21
  22 use Carp;
  23 use List::MoreUtils qw( none );
  24
  25 use Koha::Database;
  26
  27 =head1 NAME
  28
  29 Koha::Objects - Koha Object set base class
  30
  31 =head1 SYNOPSIS
  32
  33     use Koha::Objects;
  34     my @objects = Koha::Objects->search({ borrowernumber => $borrowernumber});
  35
  36 =head1 DESCRIPTION
  37
  38 This class must be subclassed.
  39
  40 =head1 API
  41
  42 =head2 Class Methods
  43
  44 =cut
  45
  46 =head3 Koha::Objects->new();
  47
  48 my $object = Koha::Objects->new();
  49
  50 =cut
  51
  52 sub new {
  53     my ($class) = @_;
  54     my $self = {};
  55
  56     bless( $self, $class );
  57 }
  58
  59 =head3 Koha::Objects->_new_from_dbic();
  60
  61 my $object = Koha::Objects->_new_from_dbic( $resultset );
  62
  63 =cut
  64
  65 sub _new_from_dbic {
  66     my ( $class, $resultset ) = @_;
  67     my $self = { _resultset => $resultset };
  68
  69     bless( $self, $class );
  70 }
  71
  72 =head3 Koha::Objects->find();
  73
  74 Similar to DBIx::Class::ResultSet->find this method accepts:
  75     \%columns_values | @pk_values, { key => $unique_constraint, %attrs }?
  76 Strictly speaking, columns_values should only refer to columns under an
  77 unique constraint.
  78
  79 It returns undef if no results were found
  80
  81 my $object = Koha::Objects->find( { col1 => $val1, col2 => $val2 } );
  82 my $object = Koha::Objects->find( $id );
  83 my $object = Koha::Objects->find( $idpart1, $idpart2, $attrs ); # composite PK
  84
  85 =cut
  86
  87 sub find {
  88     my ( $self, @pars ) = @_;
  89
  90     my $object;
  91
  92     unless (!@pars || none { defined($_) } @pars) {
  93         my $result = $self->_resultset()->find(@pars);
  94         if ($result) {
  95             $object = $self->object_class()->_new_from_dbic($result);
  96         }
  97     }
  98
  99     return $object;
 100 }
 101
 102 =head3 Koha::Objects->find_or_create();
 103
 104 my $object = Koha::Objects->find_or_create( $attrs );
 105
 106 =cut
 107
 108 sub find_or_create {
 109     my ( $self, $params ) = @_;
 110
 111     my $result = $self->_resultset->find_or_create($params);
 112
 113     return unless $result;
 114
 115     my $object = $self->object_class->_new_from_dbic($result);
 116
 117     return $object;
 118 }
 119
 120 =head3 Koha::Objects->search();
 121
 122 my @objects = Koha::Objects->search($params);
 123
 124 =cut
 125
 126 sub search {
 127     my ( $self, $params, $attributes ) = @_;
 128
 129     if (wantarray) {
 130         my @dbic_rows = $self->_resultset()->search($params, $attributes);
 131
 132         return $self->_wrap(@dbic_rows);
 133
 134     }
 135     else {
 136         my $class = ref($self) ? ref($self) : $self;
 137         my $rs = $self->_resultset()->search($params, $attributes);
 138
 139         return $class->_new_from_dbic($rs);
 140     }
 141 }
 142
 143 =head3 search_related
 144
 145     my @objects = Koha::Objects->search_related( $rel_name, $cond?, \%attrs? );
 146     my $objects = Koha::Objects->search_related( $rel_name, $cond?, \%attrs? );
 147
 148 Searches the specified relationship, optionally specifying a condition and attributes for matching records.
 149
 150 =cut
 151
 152 sub search_related {
 153     my ( $self, $rel_name, @params ) = @_;
 154
 155     return if !$rel_name;
 156     if (wantarray) {
 157         my @dbic_rows = $self->_resultset()->search_related($rel_name, @params);
 158         return if !@dbic_rows;
 159         my $object_class = _get_objects_class( $dbic_rows[0]->result_class );
 160
 161         eval "require $object_class";
 162         return _wrap( $object_class, @dbic_rows );
 163
 164     } else {
 165         my $rs = $self->_resultset()->search_related($rel_name, @params);
 166         return if !$rs;
 167         my $object_class = _get_objects_class( $rs->result_class );
 168
 169         eval "require $object_class";
 170         return _new_from_dbic( $object_class, $rs );
 171     }
 172 }
 173
 174 =head3 single
 175
 176 my $object = Koha::Objects->search({}, { rows => 1 })->single
 177
 178 Returns one and only one object that is part of this set.
 179 Returns undef if there are no objects found.
 180
 181 This is optimal as it will grab the first returned result without instantiating
 182 a cursor.
 183
 184 See:
 185 http://search.cpan.org/dist/DBIx-Class/lib/DBIx/Class/Manual/Cookbook.pod#Retrieve_one_and_only_one_row_from_a_resultset
 186
 187 =cut
 188
 189 sub single {
 190     my ($self) = @_;
 191
 192     my $single = $self->_resultset()->single;
 193     return unless $single;
 194
 195     return $self->object_class()->_new_from_dbic($single);
 196 }
 197
 198 =head3 Koha::Objects->next();
 199
 200 my $object = Koha::Objects->next();
 201
 202 Returns the next object that is part of this set.
 203 Returns undef if there are no more objects to return.
 204
 205 =cut
 206
 207 sub next {
 208     my ( $self ) = @_;
 209
 210     my $result = $self->_resultset()->next();
 211     return unless $result;
 212
 213     my $object = $self->object_class()->_new_from_dbic( $result );
 214
 215     return $object;
 216 }
 217
 218 =head3 Koha::Objects->last;
 219
 220 my $object = Koha::Objects->last;
 221
 222 Returns the last object that is part of this set.
 223 Returns undef if there are no object to return.
 224
 225 =cut
 226
 227 sub last {
 228     my ( $self ) = @_;
 229
 230     my $count = $self->_resultset->count;
 231     return unless $count;
 232
 233     my ( $result ) = $self->_resultset->slice($count - 1, $count - 1);
 234
 235     my $object = $self->object_class()->_new_from_dbic( $result );
 236
 237     return $object;
 238 }
 239
 240
 241
 242 =head3 Koha::Objects->reset();
 243
 244 Koha::Objects->reset();
 245
 246 resets iteration so the next call to next() will start agein
 247 with the first object in a set.
 248
 249 =cut
 250
 251 sub reset {
 252     my ( $self ) = @_;
 253
 254     $self->_resultset()->reset();
 255
 256     return $self;
 257 }
 258
 259 =head3 Koha::Objects->as_list();
 260
 261 Koha::Objects->as_list();
 262
 263 Returns an arrayref of the objects in this set.
 264
 265 =cut
 266
 267 sub as_list {
 268     my ( $self ) = @_;
 269
 270     my @dbic_rows = $self->_resultset()->all();
 271
 272     my @objects = $self->_wrap(@dbic_rows);
 273
 274     return wantarray ? @objects : \@objects;
 275 }
 276
 277 =head3 Koha::Objects->unblessed
 278
 279 Returns an unblessed representation of objects.
 280
 281 =cut
 282
 283 sub unblessed {
 284     my ($self) = @_;
 285
 286     return [ map { $_->unblessed } $self->as_list ];
 287 }
 288
 289 =head3 Koha::Objects->get_column
 290
 291 Return all the values of this set for a given column
 292
 293 =cut
 294
 295 sub get_column {
 296     my ($self, $column_name) = @_;
 297     return $self->_resultset->get_column( $column_name )->all;
 298 }
 299
 300 =head3 Koha::Objects->TO_JSON
 301
 302 Returns an unblessed representation of objects, suitable for JSON output.
 303
 304 =cut
 305
 306 sub TO_JSON {
 307     my ($self) = @_;
 308
 309     return [ map { $_->TO_JSON } $self->as_list ];
 310 }
 311
 312 =head3 Koha::Objects->to_api
 313
 314 Returns a representation of the objects, suitable for API output .
 315
 316 =cut
 317
 318 sub to_api {
 319     my ($self, $params) = @_;
 320
 321     return [ map { $_->to_api($params) } $self->as_list ];
 322 }
 323
 324 =head3 attributes_from_api
 325
 326     my $attributes = $objects->attributes_from_api( $api_attributes );
 327
 328 Translates attributes from the API to DBIC
 329
 330 =cut
 331
 332 sub attributes_from_api {
 333     my ( $self, $attributes ) = @_;
 334
 335     $self->{_singular_object} ||= $self->object_class->new();
 336     return $self->{_singular_object}->attributes_from_api( $attributes );
 337 }
 338
 339 =head3 from_api_mapping
 340
 341     my $mapped_attributes_hash = $objects->from_api_mapping;
 342
 343 Attributes map from the API to DBIC
 344
 345 =cut
 346
 347 sub from_api_mapping {
 348     my ( $self ) = @_;
 349
 350     $self->{_singular_object} ||= $self->object_class->new();
 351     return $self->{_singular_object}->from_api_mapping;
 352 }
 353
 354 =head3 prefetch_whitelist
 355
 356     my $whitelist = $object->prefetch_whitelist()
 357
 358 Returns a hash of prefetchable subs and the type it returns
 359
 360 =cut
 361
 362 sub prefetch_whitelist {
 363     my ( $self ) = @_;
 364
 365     $self->{_singular_object} ||= $self->object_class->new();
 366
 367     $self->{_singular_object}->prefetch_whitelist;
 368 }
 369
 370 =head3 Koha::Objects->_wrap
 371
 372 wraps the DBIC object in a corresponding Koha object
 373
 374 =cut
 375
 376 sub _wrap {
 377     my ( $self, @dbic_rows ) = @_;
 378
 379     my @objects = map { $self->object_class->_new_from_dbic( $_ ) } @dbic_rows;
 380
 381     return @objects;
 382 }
 383
 384 =head3 Koha::Objects->_resultset
 385
 386 Returns the internal resultset or creates it if undefined
 387
 388 =cut
 389
 390 sub _resultset {
 391     my ($self) = @_;
 392
 393     if ( ref($self) ) {
 394         $self->{_resultset} ||=
 395           Koha::Database->new()->schema()->resultset( $self->_type() );
 396
 397         return $self->{_resultset};
 398     }
 399     else {
 400         return Koha::Database->new()->schema()->resultset( $self->_type() );
 401     }
 402 }
 403
 404 sub _get_objects_class {
 405     my ( $type ) = @_;
 406     return unless $type;
 407
 408     if( $type->can('koha_objects_class') ) {
 409         return $type->koha_objects_class;
 410     }
 411     $type =~ s|Schema::Result::||;
 412     return "${type}s";
 413 }
 414
 415 =head3 columns
 416
 417 my @columns = Koha::Objects->columns
 418
 419 Return the table columns
 420
 421 =cut
 422
 423 sub columns {
 424     my ( $class ) = @_;
 425     return Koha::Database->new->schema->resultset( $class->_type )->result_source->columns;
 426 }
 427
 428 =head3 AUTOLOAD
 429
 430 The autoload method is used call DBIx::Class method on a resultset.
 431
 432 Important: If you plan to use one of the DBIx::Class methods you must provide
 433 relevant tests in t/db_dependent/Koha/Objects.t
 434 Currently count, pager, update and delete are covered.
 435
 436 =cut
 437
 438 sub AUTOLOAD {
 439     my ( $self, @params ) = @_;
 440
 441     my @known_methods = qw( count is_paged pager update delete result_class single slice );
 442     my $method = our $AUTOLOAD;
 443     $method =~ s/.*:://;
 444
 445
 446     unless ( grep { $_ eq $method } @known_methods ) {
 447         my $class = ref($self) ? ref($self) : $self;
 448         Koha::Exceptions::Object::MethodNotCoveredByTests->throw(
 449             error      => sprintf("The method %s->%s is not covered by tests!", $class, $method),
 450             show_trace => 1
 451         );
 452     }
 453
 454     my $r = eval { $self->_resultset->$method(@params) };
 455     if ( $@ ) {
 456         carp "No method $method found for " . ref($self) . " " . $@;
 457         return
 458     }
 459     return $r;
 460 }
 461
 462 =head3 _type
 463
 464 The _type method must be set for all child classes.
 465 The value returned by it should be the DBIC resultset name.
 466 For example, for holds, _type should return 'Reserve'.
 467
 468 =cut
 469
 470 sub _type { }
 471
 472 =head3 object_class
 473
 474 This method must be set for all child classes.
 475 The value returned by it should be the name of the Koha
 476 object class that is returned by this class.
 477 For example, for holds, object_class should return 'Koha::Hold'.
 478
 479 =cut
 480
 481 sub object_class { }
 482
 483 sub DESTROY { }
 484
 485 =head1 AUTHOR
 486
 487 Kyle M Hall <kyle@bywatersolutions.com>
 488
 489 =cut
 490
 491 1;