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 under the
   8 # terms of the GNU General Public License as published by the Free Software
   9 # Foundation; either version 3 of the License, or (at your option) any later
  10 # version.
  11 #
  12 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
  13 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  14 # A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License along
  17 # with Koha; if not, write to the Free Software Foundation, Inc.,
  18 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19
  20 use Modern::Perl;
  21
  22 use Carp;
  23
  24 use Koha::Database;
  25
  26 =head1 NAME
  27
  28 Koha::Objects - Koha Object set base class
  29
  30 =head1 SYNOPSIS
  31
  32     use Koha::Objects;
  33     my @objects = Koha::Objects->search({ borrowernumber => $borrowernumber});
  34
  35 =head1 DESCRIPTION
  36
  37 This class must be subclassed.
  38
  39 =head1 API
  40
  41 =head2 Class Methods
  42
  43 =cut
  44
  45 =head3 Koha::Objects->new();
  46
  47 my $object = Koha::Objects->new();
  48
  49 =cut
  50
  51 sub new {
  52     my ($class) = @_;
  53     my $self = {};
  54
  55     bless( $self, $class );
  56 }
  57
  58 =head3 Koha::Objects->_new_from_dbic();
  59
  60 my $object = Koha::Objects->_new_from_dbic( $resultset );
  61
  62 =cut
  63
  64 sub _new_from_dbic {
  65     my ( $class, $resultset ) = @_;
  66     my $self = { _resultset => $resultset };
  67
  68     bless( $self, $class );
  69 }
  70
  71 =head3 Koha::Objects->find();
  72
  73 my $object = Koha::Objects->find($id);
  74 my $object = Koha::Objects->find( { keypart1 => $keypart1, keypart2 => $keypart2 } );
  75
  76 =cut
  77
  78 sub find {
  79     my ( $self, $id ) = @_;
  80
  81     return unless defined($id);
  82
  83     my $result = $self->_resultset()->find($id);
  84
  85     return unless $result;
  86
  87     my $object = $self->object_class()->_new_from_dbic( $result );
  88
  89     return $object;
  90 }
  91
  92 =head3 Koha::Objects->find_or_create();
  93
  94 my $object = Koha::Objects->find_or_create( $attrs );
  95
  96 =cut
  97
  98 sub find_or_create {
  99     my ( $self, $params ) = @_;
 100
 101     my $result = $self->_resultset->find_or_create($params);
 102
 103     return unless $result;
 104
 105     my $object = $self->object_class->_new_from_dbic($result);
 106
 107     return $object;
 108 }
 109
 110 =head3 Koha::Objects->search();
 111
 112 my @objects = Koha::Objects->search($params);
 113
 114 =cut
 115
 116 sub search {
 117     my ( $self, $params, $attributes ) = @_;
 118
 119     if (wantarray) {
 120         my @dbic_rows = $self->_resultset()->search($params, $attributes);
 121
 122         return $self->_wrap(@dbic_rows);
 123
 124     }
 125     else {
 126         my $class = ref($self) ? ref($self) : $self;
 127         my $rs = $self->_resultset()->search($params, $attributes);
 128
 129         return $class->_new_from_dbic($rs);
 130     }
 131 }
 132
 133 =head3 search_related
 134
 135     my @objects = Koha::Objects->search_related( $rel_name, $cond?, \%attrs? );
 136     my $objects = Koha::Objects->search_related( $rel_name, $cond?, \%attrs? );
 137
 138 Searches the specified relationship, optionally specifying a condition and attributes for matching records.
 139
 140 =cut
 141
 142 sub search_related {
 143     my ( $self, $rel_name, @params ) = @_;
 144
 145     return if !$rel_name;
 146     if (wantarray) {
 147         my @dbic_rows = $self->_resultset()->search_related($rel_name, @params);
 148         return if !@dbic_rows;
 149         my $object_class = _get_objects_class( $dbic_rows[0]->result_class );
 150
 151         eval "require $object_class";
 152         return _wrap( $object_class, @dbic_rows );
 153
 154     } else {
 155         my $rs = $self->_resultset()->search_related($rel_name, @params);
 156         return if !$rs;
 157         my $object_class = _get_objects_class( $rs->result_class );
 158
 159         eval "require $object_class";
 160         return _new_from_dbic( $object_class, $rs );
 161     }
 162 }
 163
 164 =head3 single
 165
 166 my $object = Koha::Objects->search({}, { rows => 1 })->single
 167
 168 Returns one and only one object that is part of this set.
 169 Returns undef if there are no objects found.
 170
 171 This is optimal as it will grab the first returned result without instantiating
 172 a cursor.
 173
 174 See:
 175 http://search.cpan.org/dist/DBIx-Class/lib/DBIx/Class/Manual/Cookbook.pod#Retrieve_one_and_only_one_row_from_a_resultset
 176
 177 =cut
 178
 179 sub single {
 180     my ($self) = @_;
 181
 182     my $single = $self->_resultset()->single;
 183     return unless $single;
 184
 185     return $self->object_class()->_new_from_dbic($single);
 186 }
 187
 188 =head3 Koha::Objects->next();
 189
 190 my $object = Koha::Objects->next();
 191
 192 Returns the next object that is part of this set.
 193 Returns undef if there are no more objects to return.
 194
 195 =cut
 196
 197 sub next {
 198     my ( $self ) = @_;
 199
 200     my $result = $self->_resultset()->next();
 201     return unless $result;
 202
 203     my $object = $self->object_class()->_new_from_dbic( $result );
 204
 205     return $object;
 206 }
 207
 208 =head3 Koha::Objects->reset();
 209
 210 Koha::Objects->reset();
 211
 212 resets iteration so the next call to next() will start agein
 213 with the first object in a set.
 214
 215 =cut
 216
 217 sub reset {
 218     my ( $self ) = @_;
 219
 220     $self->_resultset()->reset();
 221
 222     return $self;
 223 }
 224
 225 =head3 Koha::Objects->as_list();
 226
 227 Koha::Objects->as_list();
 228
 229 Returns an arrayref of the objects in this set.
 230
 231 =cut
 232
 233 sub as_list {
 234     my ( $self ) = @_;
 235
 236     my @dbic_rows = $self->_resultset()->all();
 237
 238     my @objects = $self->_wrap(@dbic_rows);
 239
 240     return wantarray ? @objects : \@objects;
 241 }
 242
 243 =head3 Koha::Objects->unblessed
 244
 245 Returns an unblessed representation of objects.
 246
 247 =cut
 248
 249 sub unblessed {
 250     my ($self) = @_;
 251
 252     return [ map { $_->unblessed } $self->as_list ];
 253 }
 254
 255 =head3 Koha::Objects->_wrap
 256
 257 wraps the DBIC object in a corresponding Koha object
 258
 259 =cut
 260
 261 sub _wrap {
 262     my ( $self, @dbic_rows ) = @_;
 263
 264     my @objects = map { $self->object_class->_new_from_dbic( $_ ) } @dbic_rows;
 265
 266     return @objects;
 267 }
 268
 269 =head3 Koha::Objects->_resultset
 270
 271 Returns the internal resultset or creates it if undefined
 272
 273 =cut
 274
 275 sub _resultset {
 276     my ($self) = @_;
 277
 278     if ( ref($self) ) {
 279         $self->{_resultset} ||=
 280           Koha::Database->new()->schema()->resultset( $self->_type() );
 281
 282         return $self->{_resultset};
 283     }
 284     else {
 285         return Koha::Database->new()->schema()->resultset( $self->_type() );
 286     }
 287 }
 288
 289 sub _get_objects_class {
 290     my ( $type ) = @_;
 291     return unless $type;
 292
 293     if( $type->can('koha_objects_class') ) {
 294         return $type->koha_objects_class;
 295     }
 296     $type =~ s|Schema::Result::||;
 297     return "${type}s";
 298 }
 299
 300 =head3 columns
 301
 302 my @columns = Koha::Objects->columns
 303
 304 Return the table columns
 305
 306 =cut
 307
 308 sub columns {
 309     my ( $class ) = @_;
 310     return Koha::Database->new->schema->resultset( $class->_type )->result_source->columns;
 311 }
 312
 313 =head3 AUTOLOAD
 314
 315 The autoload method is used call DBIx::Class method on a resultset.
 316
 317 Important: If you plan to use one of the DBIx::Class methods you must provide
 318 relevant tests in t/db_dependent/Koha/Objects.t
 319 Currently count, pager, update and delete are covered.
 320
 321 =cut
 322
 323 sub AUTOLOAD {
 324     my ( $self, @params ) = @_;
 325
 326     my @known_methods = qw( count pager update delete result_class single );
 327     my $method = our $AUTOLOAD;
 328     $method =~ s/.*:://;
 329
 330     carp "The method $method is not covered by tests" and return unless grep {/^$method$/} @known_methods;
 331     my $r = eval { $self->_resultset->$method(@params) };
 332     if ( $@ ) {
 333         carp "No method $method found for " . ref($self) . " " . $@;
 334         return
 335     }
 336     return $r;
 337 }
 338
 339 =head3 _type
 340
 341 The _type method must be set for all child classes.
 342 The value returned by it should be the DBIC resultset name.
 343 For example, for holds, _type should return 'Reserve'.
 344
 345 =cut
 346
 347 sub _type { }
 348
 349 =head3 object_class
 350
 351 This method must be set for all child classes.
 352 The value returned by it should be the name of the Koha
 353 object class that is returned by this class.
 354 For example, for holds, object_class should return 'Koha::Hold'.
 355
 356 =cut
 357
 358 sub object_class { }
 359
 360 sub DESTROY { }
 361
 362 =head1 AUTHOR
 363
 364 Kyle M Hall <kyle@bywatersolutions.com>
 365
 366 =cut
 367
 368 1;