Koha/Object.pm

   1 package Koha::Object;
   2
   3 # Copyright ByWater Solutions 2014
   4 # Copyright 2016 Koha Development Team
   5 #
   6 # This file is part of Koha.
   7 #
   8 # Koha is free software; you can redistribute it and/or modify it under the
   9 # terms of the GNU General Public License as published by the Free Software
  10 # Foundation; either version 3 of the License, or (at your option) any later
  11 # version.
  12 #
  13 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
  14 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  15 # A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License along
  18 # with Koha; if not, write to the Free Software Foundation, Inc.,
  19 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20
  21 use Modern::Perl;
  22
  23 use Carp;
  24 use Mojo::JSON;
  25 use Scalar::Util qw( looks_like_number );
  26 use Try::Tiny;
  27
  28 use Koha::Database;
  29 use Koha::Exceptions::Object;
  30 use Koha::DateUtils;
  31
  32 =head1 NAME
  33
  34 Koha::Object - Koha Object base class
  35
  36 =head1 SYNOPSIS
  37
  38     use Koha::Object;
  39     my $object = Koha::Object->new({ property1 => $property1, property2 => $property2, etc... } );
  40
  41 =head1 DESCRIPTION
  42
  43 This class must always be subclassed.
  44
  45 =head1 API
  46
  47 =head2 Class Methods
  48
  49 =cut
  50
  51 =head3 Koha::Object->new();
  52
  53 my $object = Koha::Object->new();
  54 my $object = Koha::Object->new($attributes);
  55
  56 Note that this cannot be used to retrieve record from the DB.
  57
  58 =cut
  59
  60 sub new {
  61     my ( $class, $attributes ) = @_;
  62     my $self = {};
  63
  64     if ($attributes) {
  65         my $schema = Koha::Database->new->schema;
  66
  67         # Remove the arguments which exist, are not defined but NOT NULL to use the default value
  68         my $columns_info = $schema->resultset( $class->_type )->result_source->columns_info;
  69         for my $column_name ( keys %$attributes ) {
  70             my $c_info = $columns_info->{$column_name};
  71             next if $c_info->{is_nullable};
  72             next if not exists $attributes->{$column_name} or defined $attributes->{$column_name};
  73             delete $attributes->{$column_name};
  74         }
  75
  76         $self->{_result} =
  77           $schema->resultset( $class->_type() )->new($attributes);
  78     }
  79
  80     croak("No _type found! Koha::Object must be subclassed!")
  81       unless $class->_type();
  82
  83     bless( $self, $class );
  84
  85 }
  86
  87 =head3 Koha::Object->_new_from_dbic();
  88
  89 my $object = Koha::Object->_new_from_dbic($dbic_row);
  90
  91 =cut
  92
  93 sub _new_from_dbic {
  94     my ( $class, $dbic_row ) = @_;
  95     my $self = {};
  96
  97     # DBIC result row
  98     $self->{_result} = $dbic_row;
  99
 100     croak("No _type found! Koha::Object must be subclassed!")
 101       unless $class->_type();
 102
 103     croak( "DBIC result _type " . ref( $self->{_result} ) . " isn't of the _type " . $class->_type() )
 104       unless ref( $self->{_result} ) eq "Koha::Schema::Result::" . $class->_type();
 105
 106     bless( $self, $class );
 107
 108 }
 109
 110 =head3 $object->store();
 111
 112 Saves the object in storage.
 113 If the object is new, it will be created.
 114 If the object previously existed, it will be updated.
 115
 116 Returns:
 117     $self  if the store was a success
 118     undef  if the store failed
 119
 120 =cut
 121
 122 sub store {
 123     my ($self) = @_;
 124
 125     my $columns_info = $self->_result->result_source->columns_info;
 126
 127     # Handle not null and default values for integers and dates
 128     foreach my $col ( keys %{$columns_info} ) {
 129         # Integers
 130         if ( _numeric_column_type( $columns_info->{$col}->{data_type} ) ) {
 131             # Has been passed but not a number, usually an empty string
 132             if ( defined $self->$col and not looks_like_number( $self->$col ) ) {
 133                 if ( $columns_info->{$col}->{is_nullable} ) {
 134                     # If nullable, default to null
 135                     $self->$col(undef);
 136                 } else {
 137                     # If cannot be null, get the default value
 138                     # What if cannot be null and does not have a default value? Possible?
 139                     $self->$col($columns_info->{$col}->{default_value});
 140                 }
 141             }
 142         }
 143         elsif ( _date_or_datetime_column_type( $columns_info->{$col}->{data_type} ) ) {
 144             # Set to null if an empty string (or == 0 but should not happen)
 145             if ( defined $self->$col and not $self->$col ) {
 146                 if ( $columns_info->{$col}->{is_nullable} ) {
 147                     $self->$col(undef);
 148                 } else {
 149                     $self->$col($columns_info->{$col}->{default_value});
 150                 }
 151             }
 152         }
 153     }
 154
 155     try {
 156         return $self->_result()->update_or_insert() ? $self : undef;
 157     }
 158     catch {
 159         # Catch problems and raise relevant exceptions
 160         if (ref($_) eq 'DBIx::Class::Exception') {
 161             if ( $_->{msg} =~ /Cannot add or update a child row: a foreign key constraint fails/ ) {
 162                 # FK constraints
 163                 # FIXME: MySQL error, if we support more DB engines we should implement this for each
 164                 if ( $_->{msg} =~ /FOREIGN KEY \(`(?<column>.*?)`\)/ ) {
 165                     Koha::Exceptions::Object::FKConstraint->throw(
 166                         error     => 'Broken FK constraint',
 167                         broken_fk => $+{column}
 168                     );
 169                 }
 170             }
 171             elsif( $_->{msg} =~ /Duplicate entry '(.*?)' for key '(?<key>.*?)'/ ) {
 172                 Koha::Exceptions::Object::DuplicateID->throw(
 173                     error => 'Duplicate ID',
 174                     duplicate_id => $+{key}
 175                 );
 176             }
 177             elsif( $_->{msg} =~ /Incorrect (?<type>\w+) value: '(?<value>.*)' for column '(?<property>\w+)'/ ) {
 178                 Koha::Exceptions::Object::BadValue->throw(
 179                     type     => $+{type},
 180                     value    => $+{value},
 181                     property => $+{property}
 182                 );
 183             }
 184         }
 185         # Catch-all for foreign key breakages. It will help find other use cases
 186         $_->rethrow();
 187     }
 188 }
 189
 190 =head3 $object->delete();
 191
 192 Removes the object from storage.
 193
 194 Returns:
 195     1  if the deletion was a success
 196     0  if the deletion failed
 197     -1 if the object was never in storage
 198
 199 =cut
 200
 201 sub delete {
 202     my ($self) = @_;
 203
 204     # Deleting something not in storage throws an exception
 205     return -1 unless $self->_result()->in_storage();
 206
 207     # Return a boolean for succcess
 208     return $self->_result()->delete() ? 1 : 0;
 209 }
 210
 211 =head3 $object->set( $properties_hashref )
 212
 213 $object->set(
 214     {
 215         property1 => $property1,
 216         property2 => $property2,
 217         property3 => $propery3,
 218     }
 219 );
 220
 221 Enables multiple properties to be set at once
 222
 223 Returns:
 224     1      if all properties were set.
 225     0      if one or more properties do not exist.
 226     undef  if all properties exist but a different error
 227            prevents one or more properties from being set.
 228
 229 If one or more of the properties do not exist,
 230 no properties will be set.
 231
 232 =cut
 233
 234 sub set {
 235     my ( $self, $properties ) = @_;
 236
 237     my @columns = @{$self->_columns()};
 238
 239     foreach my $p ( keys %$properties ) {
 240         unless ( grep {/^$p$/} @columns ) {
 241             Koha::Exceptions::Object::PropertyNotFound->throw( "No property $p for " . ref($self) );
 242         }
 243     }
 244
 245     return $self->_result()->set_columns($properties) ? $self : undef;
 246 }
 247
 248 =head3 $object->unblessed();
 249
 250 Returns an unblessed representation of object.
 251
 252 =cut
 253
 254 sub unblessed {
 255     my ($self) = @_;
 256
 257     return { $self->_result->get_columns };
 258 }
 259
 260 =head3 $object->get_from_storage;
 261
 262 =cut
 263
 264 sub get_from_storage {
 265     my ( $self, $attrs ) = @_;
 266     my $stored_object = $self->_result->get_from_storage($attrs);
 267     my $object_class  = Koha::Object::_get_object_class( $self->_result->result_class );
 268     return $object_class->_new_from_dbic($stored_object);
 269 }
 270
 271 =head3 $object->TO_JSON
 272
 273 Returns an unblessed representation of the object, suitable for JSON output.
 274
 275 =cut
 276
 277 sub TO_JSON {
 278
 279     my ($self) = @_;
 280
 281     my $unblessed    = $self->unblessed;
 282     my $columns_info = Koha::Database->new->schema->resultset( $self->_type )
 283         ->result_source->{_columns};
 284
 285     foreach my $col ( keys %{$columns_info} ) {
 286
 287         if ( $columns_info->{$col}->{is_boolean} )
 288         {    # Handle booleans gracefully
 289             $unblessed->{$col}
 290                 = ( $unblessed->{$col} )
 291                 ? Mojo::JSON->true
 292                 : Mojo::JSON->false;
 293         }
 294         elsif ( _numeric_column_type( $columns_info->{$col}->{data_type} )
 295             and looks_like_number( $unblessed->{$col} )
 296         ) {
 297
 298             # TODO: Remove once the solution for
 299             # https://rt.cpan.org/Ticket/Display.html?id=119904
 300             # is ported to whatever distro we support by that time
 301             $unblessed->{$col} += 0;
 302         }
 303         elsif ( _datetime_column_type( $columns_info->{$col}->{data_type} ) ) {
 304             eval {
 305                 return unless $unblessed->{$col};
 306                 $unblessed->{$col} = output_pref({
 307                     dateformat => 'rfc3339',
 308                     dt         => dt_from_string($unblessed->{$col}, 'sql'),
 309                 });
 310             };
 311         }
 312     }
 313     return $unblessed;
 314 }
 315
 316 sub _date_or_datetime_column_type {
 317     my ($column_type) = @_;
 318
 319     my @dt_types = (
 320         'timestamp',
 321         'date',
 322         'datetime'
 323     );
 324
 325     return ( grep { $column_type eq $_ } @dt_types) ? 1 : 0;
 326 }
 327 sub _datetime_column_type {
 328     my ($column_type) = @_;
 329
 330     my @dt_types = (
 331         'timestamp',
 332         'datetime'
 333     );
 334
 335     return ( grep { $column_type eq $_ } @dt_types) ? 1 : 0;
 336 }
 337
 338 sub _numeric_column_type {
 339     # TODO: Remove once the solution for
 340     # https://rt.cpan.org/Ticket/Display.html?id=119904
 341     # is ported to whatever distro we support by that time
 342     my ($column_type) = @_;
 343
 344     my @numeric_types = (
 345         'bigint',
 346         'integer',
 347         'int',
 348         'mediumint',
 349         'smallint',
 350         'tinyint',
 351         'decimal',
 352         'double precision',
 353         'float'
 354     );
 355
 356     return ( grep { $column_type eq $_ } @numeric_types) ? 1 : 0;
 357 }
 358
 359 =head3 $object->unblessed_all_relateds
 360
 361 my $everything_into_one_hashref = $object->unblessed_all_relateds
 362
 363 The unblessed method only retrieves column' values for the column of the object.
 364 In a *few* cases we want to retrieve the information of all the prefetched data.
 365
 366 =cut
 367
 368 sub unblessed_all_relateds {
 369     my ($self) = @_;
 370
 371     my %data;
 372     my $related_resultsets = $self->_result->{related_resultsets} || {};
 373     my $rs = $self->_result;
 374     while ( $related_resultsets and %$related_resultsets ) {
 375         my @relations = keys %{ $related_resultsets };
 376         if ( @relations ) {
 377             my $relation = $relations[0];
 378             $rs = $rs->related_resultset($relation)->get_cache;
 379             $rs = $rs->[0]; # Does it makes sense to have several values here?
 380             my $object_class = Koha::Object::_get_object_class( $rs->result_class );
 381             my $koha_object = $object_class->_new_from_dbic( $rs );
 382             $related_resultsets = $rs->{related_resultsets};
 383             %data = ( %data, %{ $koha_object->unblessed } );
 384         }
 385     }
 386     %data = ( %data, %{ $self->unblessed } );
 387     return \%data;
 388 }
 389
 390 =head3 $object->_result();
 391
 392 Returns the internal DBIC Row object
 393
 394 =cut
 395
 396 sub _result {
 397     my ($self) = @_;
 398
 399     # If we don't have a dbic row at this point, we need to create an empty one
 400     $self->{_result} ||=
 401       Koha::Database->new()->schema()->resultset( $self->_type() )->new({});
 402
 403     return $self->{_result};
 404 }
 405
 406 =head3 $object->_columns();
 407
 408 Returns an arrayref of the table columns
 409
 410 =cut
 411
 412 sub _columns {
 413     my ($self) = @_;
 414
 415     # If we don't have a dbic row at this point, we need to create an empty one
 416     $self->{_columns} ||= [ $self->_result()->result_source()->columns() ];
 417
 418     return $self->{_columns};
 419 }
 420
 421 sub _get_object_class {
 422     my ( $type ) = @_;
 423     return unless $type;
 424
 425     if( $type->can('koha_object_class') ) {
 426         return $type->koha_object_class;
 427     }
 428     $type =~ s|Schema::Result::||;
 429     return ${type};
 430 }
 431
 432 =head3 AUTOLOAD
 433
 434 The autoload method is used only to get and set values for an objects properties.
 435
 436 =cut
 437
 438 sub AUTOLOAD {
 439     my $self = shift;
 440
 441     my $method = our $AUTOLOAD;
 442     $method =~ s/.*://;
 443
 444     my @columns = @{$self->_columns()};
 445     # Using direct setter/getter like $item->barcode() or $item->barcode($barcode);
 446     if ( grep {/^$method$/} @columns ) {
 447         if ( @_ ) {
 448             $self->_result()->set_column( $method, @_ );
 449             return $self;
 450         } else {
 451             my $value = $self->_result()->get_column( $method );
 452             return $value;
 453         }
 454     }
 455
 456     my @known_methods = qw( is_changed id in_storage get_column discard_changes update make_column_dirty );
 457
 458     Koha::Exceptions::Object::MethodNotCoveredByTests->throw(
 459         error      => sprintf("The method %s->%s is not covered by tests!", ref($self), $method),
 460         show_trace => 1
 461     ) unless grep { /^$method$/ } @known_methods;
 462
 463
 464     my $r = eval { $self->_result->$method(@_) };
 465     if ( $@ ) {
 466         Koha::Exceptions::Object->throw( ref($self) . "::$method generated this error: " . $@ );
 467     }
 468     return $r;
 469 }
 470
 471 =head3 _type
 472
 473 This method must be defined in the child class. The value is the name of the DBIC resultset.
 474 For example, for borrowers, the _type method will return "Borrower".
 475
 476 =cut
 477
 478 sub _type { }
 479
 480 sub DESTROY { }
 481
 482 =head1 AUTHOR
 483
 484 Kyle M Hall <kyle@bywatersolutions.com>
 485
 486 Jonathan Druart <jonathan.druart@bugs.koha-community.org>
 487
 488 =cut
 489
 490 1;